CocosPlugin/ccc-tnt-psd2ui
1
0
Fork 0
mirror of https://gitee.com/onvia/ccc-tnt-psd2ui synced 2025-11-07 14:57:03 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
1840eab0d3d015cf2c3b3906257396379aa7626c
ccc-tnt-psd2ui/npm-packages/mac-v2.4.x/canvas/src/CanvasRenderingContext2d.cc
onvia 1840eab0d3 增加中文转拼音- mac
2023-07-27 15:04:13 +08:00

3362 lines
101 KiB
C++
Raw Blame History

// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#include "CanvasRenderingContext2d.h"
#include <algorithm>
#include "backend/ImageBackend.h"
#include <cairo-pdf.h>
#include "Canvas.h"
#include "CanvasGradient.h"
#include "CanvasPattern.h"
#include <cmath>
#include <cstdlib>
#include "Image.h"
#include "ImageData.h"
#include <limits>
#include <map>
#include "Point.h"
#include <string>
#include "Util.h"
#include <vector>
using namespace v8;
Nan::Persistent<FunctionTemplate> Context2d::constructor;
/*
* Rectangle arg assertions.
*/
#define RECT_ARGS \
double args[4]; \
if(!checkArgs(info, args, 4)) \
return; \
double x = args[0]; \
double y = args[1]; \
double width = args[2]; \
double height = args[3];
#define CHECK_RECEIVER(prop) \
if (!Context2d::constructor.Get(info.GetIsolate())->HasInstance(info.This())) { \
Nan::ThrowTypeError("Method " #prop " called on incompatible receiver"); \
return; \
}
constexpr double twoPi = M_PI * 2.;
/*
* Simple helper macro for a rather verbose function call.
*/
#define PANGO_LAYOUT_GET_METRICS(LAYOUT) pango_context_get_metrics( \
pango_layout_get_context(LAYOUT), \
pango_layout_get_font_description(LAYOUT), \
pango_context_get_language(pango_layout_get_context(LAYOUT)))
inline static bool checkArgs(const Nan::FunctionCallbackInfo<Value> &info, double *args, int argsNum, int offset = 0){
int argsEnd = offset + argsNum;
bool areArgsValid = true;
for (int i = offset; i < argsEnd; i++) {
double val = Nan::To<double>(info[i]).FromMaybe(0);
if (areArgsValid) {
if (!std::isfinite(val)) {
// We should continue the loop instead of returning immediately
// See https://html.spec.whatwg.org/multipage/canvas.html
areArgsValid = false;
continue;
}
args[i - offset] = val;
}
}
return areArgsValid;
}
Nan::Persistent<Function> Context2d::_DOMMatrix;
Nan::Persistent<Function> Context2d::_parseFont;
/*
* Initialize Context2d.
*/
void
Context2d::Initialize(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target) {
Nan::HandleScope scope;
// Constructor
Local<FunctionTemplate> ctor = Nan::New<FunctionTemplate>(Context2d::New);
constructor.Reset(ctor);
ctor->InstanceTemplate()->SetInternalFieldCount(1);
ctor->SetClassName(Nan::New("CanvasRenderingContext2D").ToLocalChecked());
// Prototype
Local<ObjectTemplate> proto = ctor->PrototypeTemplate();
Nan::SetPrototypeMethod(ctor, "drawImage", DrawImage);
Nan::SetPrototypeMethod(ctor, "putImageData", PutImageData);
Nan::SetPrototypeMethod(ctor, "getImageData", GetImageData);
Nan::SetPrototypeMethod(ctor, "createImageData", CreateImageData);
Nan::SetPrototypeMethod(ctor, "addPage", AddPage);
Nan::SetPrototypeMethod(ctor, "save", Save);
Nan::SetPrototypeMethod(ctor, "restore", Restore);
Nan::SetPrototypeMethod(ctor, "rotate", Rotate);
Nan::SetPrototypeMethod(ctor, "translate", Translate);
Nan::SetPrototypeMethod(ctor, "transform", Transform);
Nan::SetPrototypeMethod(ctor, "getTransform", GetTransform);
Nan::SetPrototypeMethod(ctor, "resetTransform", ResetTransform);
Nan::SetPrototypeMethod(ctor, "setTransform", SetTransform);
Nan::SetPrototypeMethod(ctor, "isPointInPath", IsPointInPath);
Nan::SetPrototypeMethod(ctor, "scale", Scale);
Nan::SetPrototypeMethod(ctor, "clip", Clip);
Nan::SetPrototypeMethod(ctor, "fill", Fill);
Nan::SetPrototypeMethod(ctor, "stroke", Stroke);
Nan::SetPrototypeMethod(ctor, "fillText", FillText);
Nan::SetPrototypeMethod(ctor, "strokeText", StrokeText);
Nan::SetPrototypeMethod(ctor, "fillRect", FillRect);
Nan::SetPrototypeMethod(ctor, "strokeRect", StrokeRect);
Nan::SetPrototypeMethod(ctor, "clearRect", ClearRect);
Nan::SetPrototypeMethod(ctor, "rect", Rect);
Nan::SetPrototypeMethod(ctor, "roundRect", RoundRect);
Nan::SetPrototypeMethod(ctor, "measureText", MeasureText);
Nan::SetPrototypeMethod(ctor, "moveTo", MoveTo);
Nan::SetPrototypeMethod(ctor, "lineTo", LineTo);
Nan::SetPrototypeMethod(ctor, "bezierCurveTo", BezierCurveTo);
Nan::SetPrototypeMethod(ctor, "quadraticCurveTo", QuadraticCurveTo);
Nan::SetPrototypeMethod(ctor, "beginPath", BeginPath);
Nan::SetPrototypeMethod(ctor, "closePath", ClosePath);
Nan::SetPrototypeMethod(ctor, "arc", Arc);
Nan::SetPrototypeMethod(ctor, "arcTo", ArcTo);
Nan::SetPrototypeMethod(ctor, "ellipse", Ellipse);
Nan::SetPrototypeMethod(ctor, "setLineDash", SetLineDash);
Nan::SetPrototypeMethod(ctor, "getLineDash", GetLineDash);
Nan::SetPrototypeMethod(ctor, "createPattern", CreatePattern);
Nan::SetPrototypeMethod(ctor, "createLinearGradient", CreateLinearGradient);
Nan::SetPrototypeMethod(ctor, "createRadialGradient", CreateRadialGradient);
Nan::SetAccessor(proto, Nan::New("pixelFormat").ToLocalChecked(), GetFormat);
Nan::SetAccessor(proto, Nan::New("patternQuality").ToLocalChecked(), GetPatternQuality, SetPatternQuality);
Nan::SetAccessor(proto, Nan::New("imageSmoothingEnabled").ToLocalChecked(), GetImageSmoothingEnabled, SetImageSmoothingEnabled);
Nan::SetAccessor(proto, Nan::New("globalCompositeOperation").ToLocalChecked(), GetGlobalCompositeOperation, SetGlobalCompositeOperation);
Nan::SetAccessor(proto, Nan::New("globalAlpha").ToLocalChecked(), GetGlobalAlpha, SetGlobalAlpha);
Nan::SetAccessor(proto, Nan::New("shadowColor").ToLocalChecked(), GetShadowColor, SetShadowColor);
Nan::SetAccessor(proto, Nan::New("miterLimit").ToLocalChecked(), GetMiterLimit, SetMiterLimit);
Nan::SetAccessor(proto, Nan::New("lineWidth").ToLocalChecked(), GetLineWidth, SetLineWidth);
Nan::SetAccessor(proto, Nan::New("lineCap").ToLocalChecked(), GetLineCap, SetLineCap);
Nan::SetAccessor(proto, Nan::New("lineJoin").ToLocalChecked(), GetLineJoin, SetLineJoin);
Nan::SetAccessor(proto, Nan::New("lineDashOffset").ToLocalChecked(), GetLineDashOffset, SetLineDashOffset);
Nan::SetAccessor(proto, Nan::New("shadowOffsetX").ToLocalChecked(), GetShadowOffsetX, SetShadowOffsetX);
Nan::SetAccessor(proto, Nan::New("shadowOffsetY").ToLocalChecked(), GetShadowOffsetY, SetShadowOffsetY);
Nan::SetAccessor(proto, Nan::New("shadowBlur").ToLocalChecked(), GetShadowBlur, SetShadowBlur);
Nan::SetAccessor(proto, Nan::New("antialias").ToLocalChecked(), GetAntiAlias, SetAntiAlias);
Nan::SetAccessor(proto, Nan::New("textDrawingMode").ToLocalChecked(), GetTextDrawingMode, SetTextDrawingMode);
Nan::SetAccessor(proto, Nan::New("quality").ToLocalChecked(), GetQuality, SetQuality);
Nan::SetAccessor(proto, Nan::New("currentTransform").ToLocalChecked(), GetCurrentTransform, SetCurrentTransform);
Nan::SetAccessor(proto, Nan::New("fillStyle").ToLocalChecked(), GetFillStyle, SetFillStyle);
Nan::SetAccessor(proto, Nan::New("strokeStyle").ToLocalChecked(), GetStrokeStyle, SetStrokeStyle);
Nan::SetAccessor(proto, Nan::New("font").ToLocalChecked(), GetFont, SetFont);
Nan::SetAccessor(proto, Nan::New("textBaseline").ToLocalChecked(), GetTextBaseline, SetTextBaseline);
Nan::SetAccessor(proto, Nan::New("textAlign").ToLocalChecked(), GetTextAlign, SetTextAlign);
Local<Context> ctx = Nan::GetCurrentContext();
Nan::Set(target, Nan::New("CanvasRenderingContext2d").ToLocalChecked(), ctor->GetFunction(ctx).ToLocalChecked());
Nan::Set(target, Nan::New("CanvasRenderingContext2dInit").ToLocalChecked(), Nan::New<Function>(SaveExternalModules));
}
/*
* Create a cairo context.
*/
Context2d::Context2d(Canvas *canvas) {
_canvas = canvas;
_context = canvas->createCairoContext();
_layout = pango_cairo_create_layout(_context);
states.emplace();
state = &states.top();
pango_layout_set_font_description(_layout, state->fontDescription);
}
/*
* Destroy cairo context.
*/
Context2d::~Context2d() {
g_object_unref(_layout);
cairo_destroy(_context);
_resetPersistentHandles();
}
/*
* Reset canvas state.
*/
void Context2d::resetState() {
states.pop();
states.emplace();
pango_layout_set_font_description(_layout, state->fontDescription);
_resetPersistentHandles();
}
void Context2d::_resetPersistentHandles() {
_fillStyle.Reset();
_strokeStyle.Reset();
_font.Reset();
}
/*
* Save cairo / canvas state.
*/
void
Context2d::save() {
cairo_save(_context);
states.emplace(states.top());
state = &states.top();
}
/*
* Restore cairo / canvas state.
*/
void
Context2d::restore() {
if (states.size() > 1) {
cairo_restore(_context);
states.pop();
state = &states.top();
pango_layout_set_font_description(_layout, state->fontDescription);
}
}
/*
* Save flat path.
*/
void
Context2d::savePath() {
_path = cairo_copy_path_flat(_context);
cairo_new_path(_context);
}
/*
* Restore flat path.
*/
void
Context2d::restorePath() {
cairo_new_path(_context);
cairo_append_path(_context, _path);
cairo_path_destroy(_path);
}
/*
* Create temporary surface for gradient or pattern transparency
*/
cairo_pattern_t*
create_transparent_gradient(cairo_pattern_t *source, float alpha) {
double x0;
double y0;
double x1;
double y1;
double r0;
double r1;
int count;
int i;
double offset;
double r;
double g;
double b;
double a;
cairo_pattern_t *newGradient;
cairo_pattern_type_t type = cairo_pattern_get_type(source);
cairo_pattern_get_color_stop_count(source, &count);
if (type == CAIRO_PATTERN_TYPE_LINEAR) {
cairo_pattern_get_linear_points (source, &x0, &y0, &x1, &y1);
newGradient = cairo_pattern_create_linear(x0, y0, x1, y1);
} else if (type == CAIRO_PATTERN_TYPE_RADIAL) {
cairo_pattern_get_radial_circles(source, &x0, &y0, &r0, &x1, &y1, &r1);
newGradient = cairo_pattern_create_radial(x0, y0, r0, x1, y1, r1);
} else {
Nan::ThrowError("Unexpected gradient type");
return NULL;
}
for ( i = 0; i < count; i++ ) {
cairo_pattern_get_color_stop_rgba(source, i, &offset, &r, &g, &b, &a);
cairo_pattern_add_color_stop_rgba(newGradient, offset, r, g, b, a * alpha);
}
return newGradient;
}
cairo_pattern_t*
create_transparent_pattern(cairo_pattern_t *source, float alpha) {
cairo_surface_t *surface;
cairo_pattern_get_surface(source, &surface);
int width = cairo_image_surface_get_width(surface);
int height = cairo_image_surface_get_height(surface);
cairo_surface_t *mask_surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
width,
height);
cairo_t *mask_context = cairo_create(mask_surface);
if (cairo_status(mask_context) != CAIRO_STATUS_SUCCESS) {
Nan::ThrowError("Failed to initialize context");
return NULL;
}
cairo_set_source(mask_context, source);
cairo_paint_with_alpha(mask_context, alpha);
cairo_destroy(mask_context);
cairo_pattern_t* newPattern = cairo_pattern_create_for_surface(mask_surface);
cairo_surface_destroy(mask_surface);
return newPattern;
}
/*
* Fill and apply shadow.
*/
void
Context2d::setFillRule(v8::Local<v8::Value> value) {
cairo_fill_rule_t rule = CAIRO_FILL_RULE_WINDING;
if (value->IsString()) {
Nan::Utf8String str(value);
if (std::strcmp(*str, "evenodd") == 0) {
rule = CAIRO_FILL_RULE_EVEN_ODD;
}
}
cairo_set_fill_rule(_context, rule);
}
void
Context2d::fill(bool preserve) {
cairo_pattern_t *new_pattern;
bool needsRestore = false;
if (state->fillPattern) {
if (state->globalAlpha < 1) {
new_pattern = create_transparent_pattern(state->fillPattern, state->globalAlpha);
if (new_pattern == NULL) {
// failed to allocate; Nan::ThrowError has already been called, so return from this fn.
return;
}
cairo_set_source(_context, new_pattern);
cairo_pattern_destroy(new_pattern);
} else {
cairo_pattern_set_filter(state->fillPattern, state->patternQuality);
cairo_set_source(_context, state->fillPattern);
}
repeat_type_t repeat = Pattern::get_repeat_type_for_cairo_pattern(state->fillPattern);
if (repeat == NO_REPEAT) {
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_NONE);
} else if (repeat == REPEAT) {
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_REPEAT);
} else {
cairo_save(_context);
cairo_path_t *savedPath = cairo_copy_path(_context);
cairo_surface_t *patternSurface = nullptr;
cairo_pattern_get_surface(cairo_get_source(_context), &patternSurface);
double width, height;
if (repeat == REPEAT_X) {
double x1, x2;
cairo_path_extents(_context, &x1, nullptr, &x2, nullptr);
width = x2 - x1;
height = cairo_image_surface_get_height(patternSurface);
} else {
double y1, y2;
cairo_path_extents(_context, nullptr, &y1, nullptr, &y2);
width = cairo_image_surface_get_width(patternSurface);
height = y2 - y1;
}
cairo_new_path(_context);
cairo_rectangle(_context, 0, 0, width, height);
cairo_clip(_context);
cairo_append_path(_context, savedPath);
cairo_path_destroy(savedPath);
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_REPEAT);
needsRestore = true;
}
} else if (state->fillGradient) {
if (state->globalAlpha < 1) {
new_pattern = create_transparent_gradient(state->fillGradient, state->globalAlpha);
if (new_pattern == NULL) {
// failed to recognize gradient; Nan::ThrowError has already been called, so return from this fn.
return;
}
cairo_pattern_set_filter(new_pattern, state->patternQuality);
cairo_set_source(_context, new_pattern);
cairo_pattern_destroy(new_pattern);
} else {
cairo_pattern_set_filter(state->fillGradient, state->patternQuality);
cairo_set_source(_context, state->fillGradient);
}
} else {
setSourceRGBA(state->fill);
}
if (preserve) {
hasShadow()
? shadow(cairo_fill_preserve)
: cairo_fill_preserve(_context);
} else {
hasShadow()
? shadow(cairo_fill)
: cairo_fill(_context);
}
if (needsRestore) {
cairo_restore(_context);
}
}
/*
* Stroke and apply shadow.
*/
void
Context2d::stroke(bool preserve) {
cairo_pattern_t *new_pattern;
if (state->strokePattern) {
if (state->globalAlpha < 1) {
new_pattern = create_transparent_pattern(state->strokePattern, state->globalAlpha);
if (new_pattern == NULL) {
// failed to allocate; Nan::ThrowError has already been called, so return from this fn.
return;
}
cairo_set_source(_context, new_pattern);
cairo_pattern_destroy(new_pattern);
} else {
cairo_pattern_set_filter(state->strokePattern, state->patternQuality);
cairo_set_source(_context, state->strokePattern);
}
repeat_type_t repeat = Pattern::get_repeat_type_for_cairo_pattern(state->strokePattern);
if (NO_REPEAT == repeat) {
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_NONE);
} else {
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_REPEAT);
}
} else if (state->strokeGradient) {
if (state->globalAlpha < 1) {
new_pattern = create_transparent_gradient(state->strokeGradient, state->globalAlpha);
if (new_pattern == NULL) {
// failed to recognize gradient; Nan::ThrowError has already been called, so return from this fn.
return;
}
cairo_pattern_set_filter(new_pattern, state->patternQuality);
cairo_set_source(_context, new_pattern);
cairo_pattern_destroy(new_pattern);
} else {
cairo_pattern_set_filter(state->strokeGradient, state->patternQuality);
cairo_set_source(_context, state->strokeGradient);
}
} else {
setSourceRGBA(state->stroke);
}
if (preserve) {
hasShadow()
? shadow(cairo_stroke_preserve)
: cairo_stroke_preserve(_context);
} else {
hasShadow()
? shadow(cairo_stroke)
: cairo_stroke(_context);
}
}
/*
* Apply shadow with the given draw fn.
*/
void
Context2d::shadow(void (fn)(cairo_t *cr)) {
cairo_path_t *path = cairo_copy_path_flat(_context);
cairo_save(_context);
// shadowOffset is unaffected by current transform
cairo_matrix_t path_matrix;
cairo_get_matrix(_context, &path_matrix);
cairo_identity_matrix(_context);
// Apply shadow
cairo_push_group(_context);
// No need to invoke blur if shadowBlur is 0
if (state->shadowBlur) {
// find out extent of path
double x1, y1, x2, y2;
if (fn == cairo_fill || fn == cairo_fill_preserve) {
cairo_fill_extents(_context, &x1, &y1, &x2, &y2);
} else {
cairo_stroke_extents(_context, &x1, &y1, &x2, &y2);
}
// create new image surface that size + padding for blurring
double dx = x2-x1, dy = y2-y1;
cairo_user_to_device_distance(_context, &dx, &dy);
int pad = state->shadowBlur * 2;
cairo_surface_t *shadow_surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
dx + 2 * pad,
dy + 2 * pad);
cairo_t *shadow_context = cairo_create(shadow_surface);
// transform path to the right place
cairo_translate(shadow_context, pad-x1, pad-y1);
cairo_transform(shadow_context, &path_matrix);
// set lineCap lineJoin lineDash
cairo_set_line_cap(shadow_context, cairo_get_line_cap(_context));
cairo_set_line_join(shadow_context, cairo_get_line_join(_context));
double offset;
int dashes = cairo_get_dash_count(_context);
std::vector<double> a(dashes);
cairo_get_dash(_context, a.data(), &offset);
cairo_set_dash(shadow_context, a.data(), dashes, offset);
// draw the path and blur
cairo_set_line_width(shadow_context, cairo_get_line_width(_context));
cairo_new_path(shadow_context);
cairo_append_path(shadow_context, path);
setSourceRGBA(shadow_context, state->shadow);
fn(shadow_context);
blur(shadow_surface, state->shadowBlur);
// paint to original context
cairo_set_source_surface(_context, shadow_surface,
x1 - pad + state->shadowOffsetX + 1,
y1 - pad + state->shadowOffsetY + 1);
cairo_paint(_context);
cairo_destroy(shadow_context);
cairo_surface_destroy(shadow_surface);
} else {
// Offset first, then apply path's transform
cairo_translate(
_context
, state->shadowOffsetX
, state->shadowOffsetY);
cairo_transform(_context, &path_matrix);
// Apply shadow
cairo_new_path(_context);
cairo_append_path(_context, path);
setSourceRGBA(state->shadow);
fn(_context);
}
// Paint the shadow
cairo_pop_group_to_source(_context);
cairo_paint(_context);
// Restore state
cairo_restore(_context);
cairo_new_path(_context);
cairo_append_path(_context, path);
fn(_context);
cairo_path_destroy(path);
}
/*
* Set source RGBA for the current context
*/
void
Context2d::setSourceRGBA(rgba_t color) {
setSourceRGBA(_context, color);
}
/*
* Set source RGBA
*/
void
Context2d::setSourceRGBA(cairo_t *ctx, rgba_t color) {
cairo_set_source_rgba(
ctx
, color.r
, color.g
, color.b
, color.a * state->globalAlpha);
}
/*
* Check if the context has a drawable shadow.
*/
bool
Context2d::hasShadow() {
return state->shadow.a
&& (state->shadowBlur || state->shadowOffsetX || state->shadowOffsetY);
}
/*
* Blur the given surface with the given radius.
*/
void
Context2d::blur(cairo_surface_t *surface, int radius) {
// Steve Hanov, 2009
// Released into the public domain.
radius = radius * 0.57735f + 0.5f;
// get width, height
int width = cairo_image_surface_get_width( surface );
int height = cairo_image_surface_get_height( surface );
unsigned* precalc =
(unsigned*)malloc(width*height*sizeof(unsigned));
cairo_surface_flush( surface );
unsigned char* src = cairo_image_surface_get_data( surface );
double mul=1.f/((radius*2)*(radius*2));
int channel;
// The number of times to perform the averaging. According to wikipedia,
// three iterations is good enough to pass for a gaussian.
const int MAX_ITERATIONS = 3;
int iteration;
for ( iteration = 0; iteration < MAX_ITERATIONS; iteration++ ) {
for( channel = 0; channel < 4; channel++ ) {
int x,y;
// precomputation step.
unsigned char* pix = src;
unsigned* pre = precalc;
pix += channel;
for (y=0;y<height;y++) {
for (x=0;x<width;x++) {
int tot=pix[0];
if (x>0) tot+=pre[-1];
if (y>0) tot+=pre[-width];
if (x>0 && y>0) tot-=pre[-width-1];
*pre++=tot;
pix += 4;
}
}
// blur step.
pix = src + (int)radius * width * 4 + (int)radius * 4 + channel;
for (y=radius;y<height-radius;y++) {
for (x=radius;x<width-radius;x++) {
int l = x < radius ? 0 : x - radius;
int t = y < radius ? 0 : y - radius;
int r = x + radius >= width ? width - 1 : x + radius;
int b = y + radius >= height ? height - 1 : y + radius;
int tot = precalc[r+b*width] + precalc[l+t*width] -
precalc[l+b*width] - precalc[r+t*width];
*pix=(unsigned char)(tot*mul);
pix += 4;
}
pix += (int)radius * 2 * 4;
}
}
}
cairo_surface_mark_dirty(surface);
free(precalc);
}
/*
* Initialize a new Context2d with the given canvas.
*/
NAN_METHOD(Context2d::New) {
if (!info.IsConstructCall()) {
return Nan::ThrowTypeError("Class constructors cannot be invoked without 'new'");
}
if (!info[0]->IsObject())
return Nan::ThrowTypeError("Canvas expected");
Local<Object> obj = Nan::To<Object>(info[0]).ToLocalChecked();
if (!Nan::New(Canvas::constructor)->HasInstance(obj))
return Nan::ThrowTypeError("Canvas expected");
Canvas *canvas = Nan::ObjectWrap::Unwrap<Canvas>(obj);
bool isImageBackend = canvas->backend()->getName() == "image";
if (isImageBackend) {
cairo_format_t format = ImageBackend::DEFAULT_FORMAT;
if (info[1]->IsObject()) {
Local<Object> ctxAttributes = Nan::To<Object>(info[1]).ToLocalChecked();
Local<Value> pixelFormat = Nan::Get(ctxAttributes, Nan::New("pixelFormat").ToLocalChecked()).ToLocalChecked();
if (pixelFormat->IsString()) {
Nan::Utf8String utf8PixelFormat(pixelFormat);
if (!strcmp(*utf8PixelFormat, "RGBA32")) format = CAIRO_FORMAT_ARGB32;
else if (!strcmp(*utf8PixelFormat, "RGB24")) format = CAIRO_FORMAT_RGB24;
else if (!strcmp(*utf8PixelFormat, "A8")) format = CAIRO_FORMAT_A8;
else if (!strcmp(*utf8PixelFormat, "RGB16_565")) format = CAIRO_FORMAT_RGB16_565;
else if (!strcmp(*utf8PixelFormat, "A1")) format = CAIRO_FORMAT_A1;
#ifdef CAIRO_FORMAT_RGB30
else if (!strcmp(utf8PixelFormat, "RGB30")) format = CAIRO_FORMAT_RGB30;
#endif
}
// alpha: false forces use of RGB24
Local<Value> alpha = Nan::Get(ctxAttributes, Nan::New("alpha").ToLocalChecked()).ToLocalChecked();
if (alpha->IsBoolean() && !Nan::To<bool>(alpha).FromMaybe(false)) {
format = CAIRO_FORMAT_RGB24;
}
}
static_cast<ImageBackend*>(canvas->backend())->setFormat(format);
}
Context2d *context = new Context2d(canvas);
context->Wrap(info.This());
info.GetReturnValue().Set(info.This());
}
/*
* Save some external modules as private references.
*/
NAN_METHOD(Context2d::SaveExternalModules) {
_DOMMatrix.Reset(Nan::To<Function>(info[0]).ToLocalChecked());
_parseFont.Reset(Nan::To<Function>(info[1]).ToLocalChecked());
}
/*
* Get format (string).
*/
NAN_GETTER(Context2d::GetFormat) {
CHECK_RECEIVER(Context2d.GetFormat);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
std::string pixelFormatString;
switch (context->canvas()->backend()->getFormat()) {
case CAIRO_FORMAT_ARGB32: pixelFormatString = "RGBA32"; break;
case CAIRO_FORMAT_RGB24: pixelFormatString = "RGB24"; break;
case CAIRO_FORMAT_A8: pixelFormatString = "A8"; break;
case CAIRO_FORMAT_A1: pixelFormatString = "A1"; break;
case CAIRO_FORMAT_RGB16_565: pixelFormatString = "RGB16_565"; break;
#ifdef CAIRO_FORMAT_RGB30
case CAIRO_FORMAT_RGB30: pixelFormatString = "RGB30"; break;
#endif
default: return info.GetReturnValue().SetNull();
}
info.GetReturnValue().Set(Nan::New<String>(pixelFormatString).ToLocalChecked());
}
/*
* Create a new page.
*/
NAN_METHOD(Context2d::AddPage) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (context->canvas()->backend()->getName() != "pdf") {
return Nan::ThrowError("only PDF canvases support .addPage()");
}
cairo_show_page(context->context());
int width = Nan::To<int32_t>(info[0]).FromMaybe(0);
int height = Nan::To<int32_t>(info[1]).FromMaybe(0);
if (width < 1) width = context->canvas()->getWidth();
if (height < 1) height = context->canvas()->getHeight();
cairo_pdf_surface_set_size(context->canvas()->surface(), width, height);
return;
}
/*
* Put image data.
*
* - imageData, dx, dy
* - imageData, dx, dy, sx, sy, sw, sh
*
*/
NAN_METHOD(Context2d::PutImageData) {
if (!info[0]->IsObject())
return Nan::ThrowTypeError("ImageData expected");
Local<Object> obj = Nan::To<Object>(info[0]).ToLocalChecked();
if (!Nan::New(ImageData::constructor)->HasInstance(obj))
return Nan::ThrowTypeError("ImageData expected");
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
ImageData *imageData = Nan::ObjectWrap::Unwrap<ImageData>(obj);
uint8_t *src = imageData->data();
uint8_t *dst = context->canvas()->data();
int dstStride = context->canvas()->stride();
int Bpp = dstStride / context->canvas()->getWidth();
int srcStride = Bpp * imageData->width();
int sx = 0
, sy = 0
, sw = 0
, sh = 0
, dx = Nan::To<int32_t>(info[1]).FromMaybe(0)
, dy = Nan::To<int32_t>(info[2]).FromMaybe(0)
, rows
, cols;
switch (info.Length()) {
// imageData, dx, dy
case 3:
sw = imageData->width();
sh = imageData->height();
break;
// imageData, dx, dy, sx, sy, sw, sh
case 7:
sx = Nan::To<int32_t>(info[3]).FromMaybe(0);
sy = Nan::To<int32_t>(info[4]).FromMaybe(0);
sw = Nan::To<int32_t>(info[5]).FromMaybe(0);
sh = Nan::To<int32_t>(info[6]).FromMaybe(0);
// fix up negative height, width
if (sw < 0) sx += sw, sw = -sw;
if (sh < 0) sy += sh, sh = -sh;
// clamp the left edge
if (sx < 0) sw += sx, sx = 0;
if (sy < 0) sh += sy, sy = 0;
// clamp the right edge
if (sx + sw > imageData->width()) sw = imageData->width() - sx;
if (sy + sh > imageData->height()) sh = imageData->height() - sy;
// start destination at source offset
dx += sx;
dy += sy;
break;
default:
return Nan::ThrowError("invalid arguments");
}
// chop off outlying source data
if (dx < 0) sw += dx, sx -= dx, dx = 0;
if (dy < 0) sh += dy, sy -= dy, dy = 0;
// clamp width at canvas size
// Need to wrap std::min calls using parens to prevent macro expansion on
// windows. See http://stackoverflow.com/questions/5004858/stdmin-gives-error
cols = (std::min)(sw, context->canvas()->getWidth() - dx);
rows = (std::min)(sh, context->canvas()->getHeight() - dy);
if (cols <= 0 || rows <= 0) return;
switch (context->canvas()->backend()->getFormat()) {
case CAIRO_FORMAT_ARGB32: {
src += sy * srcStride + sx * 4;
dst += dstStride * dy + 4 * dx;
for (int y = 0; y < rows; ++y) {
uint8_t *dstRow = dst;
uint8_t *srcRow = src;
for (int x = 0; x < cols; ++x) {
// rgba
uint8_t r = *srcRow++;
uint8_t g = *srcRow++;
uint8_t b = *srcRow++;
uint8_t a = *srcRow++;
// argb
// performance optimization: fully transparent/opaque pixels can be
// processed more efficiently.
if (a == 0) {
*dstRow++ = 0;
*dstRow++ = 0;
*dstRow++ = 0;
*dstRow++ = 0;
} else if (a == 255) {
*dstRow++ = b;
*dstRow++ = g;
*dstRow++ = r;
*dstRow++ = a;
} else {
float alpha = (float)a / 255;
*dstRow++ = b * alpha;
*dstRow++ = g * alpha;
*dstRow++ = r * alpha;
*dstRow++ = a;
}
}
dst += dstStride;
src += srcStride;
}
break;
}
case CAIRO_FORMAT_RGB24: {
src += sy * srcStride + sx * 4;
dst += dstStride * dy + 4 * dx;
for (int y = 0; y < rows; ++y) {
uint8_t *dstRow = dst;
uint8_t *srcRow = src;
for (int x = 0; x < cols; ++x) {
// rgba
uint8_t r = *srcRow++;
uint8_t g = *srcRow++;
uint8_t b = *srcRow++;
srcRow++;
// argb
*dstRow++ = b;
*dstRow++ = g;
*dstRow++ = r;
*dstRow++ = 255;
}
dst += dstStride;
src += srcStride;
}
break;
}
case CAIRO_FORMAT_A8: {
src += sy * srcStride + sx;
dst += dstStride * dy + dx;
if (srcStride == dstStride && cols == dstStride) {
// fast path: strides are the same and doing a full-width put
memcpy(dst, src, cols * rows);
} else {
for (int y = 0; y < rows; ++y) {
memcpy(dst, src, cols);
dst += dstStride;
src += srcStride;
}
}
break;
}
case CAIRO_FORMAT_A1: {
// TODO Should this be totally packed, or maintain a stride divisible by 4?
Nan::ThrowError("putImageData for CANVAS_FORMAT_A1 is not yet implemented");
break;
}
case CAIRO_FORMAT_RGB16_565: {
src += sy * srcStride + sx * 2;
dst += dstStride * dy + 2 * dx;
for (int y = 0; y < rows; ++y) {
memcpy(dst, src, cols * 2);
dst += dstStride;
src += srcStride;
}
break;
}
#ifdef CAIRO_FORMAT_RGB30
case CAIRO_FORMAT_RGB30: {
// TODO
Nan::ThrowError("putImageData for CANVAS_FORMAT_RGB30 is not yet implemented");
break;
}
#endif
default: {
Nan::ThrowError("Invalid pixel format or not an image canvas");
return;
}
}
cairo_surface_mark_dirty_rectangle(
context->canvas()->surface()
, dx
, dy
, cols
, rows);
}
/*
* Get image data.
*
* - sx, sy, sw, sh
*
*/
NAN_METHOD(Context2d::GetImageData) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Canvas *canvas = context->canvas();
int sx = Nan::To<int32_t>(info[0]).FromMaybe(0);
int sy = Nan::To<int32_t>(info[1]).FromMaybe(0);
int sw = Nan::To<int32_t>(info[2]).FromMaybe(0);
int sh = Nan::To<int32_t>(info[3]).FromMaybe(0);
if (!sw)
return Nan::ThrowError("IndexSizeError: The source width is 0.");
if (!sh)
return Nan::ThrowError("IndexSizeError: The source height is 0.");
int width = canvas->getWidth();
int height = canvas->getHeight();
if (!width)
return Nan::ThrowTypeError("Canvas width is 0");
if (!height)
return Nan::ThrowTypeError("Canvas height is 0");
// WebKit and Firefox have this behavior:
// Flip the coordinates so the origin is top/left-most:
if (sw < 0) {
sx += sw;
sw = -sw;
}
if (sh < 0) {
sy += sh;
sh = -sh;
}
if (sx + sw > width) sw = width - sx;
if (sy + sh > height) sh = height - sy;
// WebKit/moz functionality. node-canvas used to return in either case.
if (sw <= 0) sw = 1;
if (sh <= 0) sh = 1;
// Non-compliant. "Pixels outside the canvas must be returned as transparent
// black." This instead clips the returned array to the canvas area.
if (sx < 0) {
sw += sx;
sx = 0;
}
if (sy < 0) {
sh += sy;
sy = 0;
}
int srcStride = canvas->stride();
int bpp = srcStride / width;
int size = sw * sh * bpp;
int dstStride = sw * bpp;
uint8_t *src = canvas->data();
Local<ArrayBuffer> buffer = ArrayBuffer::New(Isolate::GetCurrent(), size);
Local<TypedArray> dataArray;
if (canvas->backend()->getFormat() == CAIRO_FORMAT_RGB16_565) {
dataArray = Uint16Array::New(buffer, 0, size >> 1);
} else {
dataArray = Uint8ClampedArray::New(buffer, 0, size);
}
Nan::TypedArrayContents<uint8_t> typedArrayContents(dataArray);
uint8_t* dst = *typedArrayContents;
switch (canvas->backend()->getFormat()) {
case CAIRO_FORMAT_ARGB32: {
// Rearrange alpha (argb -> rgba), undo alpha pre-multiplication,
// and store in big-endian format
for (int y = 0; y < sh; ++y) {
uint32_t *row = (uint32_t *)(src + srcStride * (y + sy));
for (int x = 0; x < sw; ++x) {
int bx = x * 4;
uint32_t *pixel = row + x + sx;
uint8_t a = *pixel >> 24;
uint8_t r = *pixel >> 16;
uint8_t g = *pixel >> 8;
uint8_t b = *pixel;
dst[bx + 3] = a;
// Performance optimization: fully transparent/opaque pixels can be
// processed more efficiently.
if (a == 0 || a == 255) {
dst[bx + 0] = r;
dst[bx + 1] = g;
dst[bx + 2] = b;
} else {
// Undo alpha pre-multiplication
float alphaR = (float)255 / a;
dst[bx + 0] = (int)((float)r * alphaR);
dst[bx + 1] = (int)((float)g * alphaR);
dst[bx + 2] = (int)((float)b * alphaR);
}
}
dst += dstStride;
}
break;
}
case CAIRO_FORMAT_RGB24: {
// Rearrange alpha (argb -> rgba) and store in big-endian format
for (int y = 0; y < sh; ++y) {
uint32_t *row = (uint32_t *)(src + srcStride * (y + sy));
for (int x = 0; x < sw; ++x) {
int bx = x * 4;
uint32_t *pixel = row + x + sx;
uint8_t r = *pixel >> 16;
uint8_t g = *pixel >> 8;
uint8_t b = *pixel;
dst[bx + 0] = r;
dst[bx + 1] = g;
dst[bx + 2] = b;
dst[bx + 3] = 255;
}
dst += dstStride;
}
break;
}
case CAIRO_FORMAT_A8: {
for (int y = 0; y < sh; ++y) {
uint8_t *row = (uint8_t *)(src + srcStride * (y + sy));
memcpy(dst, row + sx, dstStride);
dst += dstStride;
}
break;
}
case CAIRO_FORMAT_A1: {
// TODO Should this be totally packed, or maintain a stride divisible by 4?
Nan::ThrowError("getImageData for CANVAS_FORMAT_A1 is not yet implemented");
break;
}
case CAIRO_FORMAT_RGB16_565: {
for (int y = 0; y < sh; ++y) {
uint16_t *row = (uint16_t *)(src + srcStride * (y + sy));
memcpy(dst, row + sx, dstStride);
dst += dstStride;
}
break;
}
#ifdef CAIRO_FORMAT_RGB30
case CAIRO_FORMAT_RGB30: {
// TODO
Nan::ThrowError("getImageData for CANVAS_FORMAT_RGB30 is not yet implemented");
break;
}
#endif
default: {
// Unlikely
Nan::ThrowError("Invalid pixel format or not an image canvas");
return;
}
}
const int argc = 3;
Local<Int32> swHandle = Nan::New(sw);
Local<Int32> shHandle = Nan::New(sh);
Local<Value> argv[argc] = { dataArray, swHandle, shHandle };
Local<Function> ctor = Nan::GetFunction(Nan::New(ImageData::constructor)).ToLocalChecked();
Local<Object> instance = Nan::NewInstance(ctor, argc, argv).ToLocalChecked();
info.GetReturnValue().Set(instance);
}
/**
* Create `ImageData` with the given dimensions or
* `ImageData` instance for dimensions.
*/
NAN_METHOD(Context2d::CreateImageData){
Isolate *iso = Isolate::GetCurrent();
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Canvas *canvas = context->canvas();
int32_t width, height;
if (info[0]->IsObject()) {
Local<Object> obj = Nan::To<Object>(info[0]).ToLocalChecked();
width = Nan::To<int32_t>(Nan::Get(obj, Nan::New("width").ToLocalChecked()).ToLocalChecked()).FromMaybe(0);
height = Nan::To<int32_t>(Nan::Get(obj, Nan::New("height").ToLocalChecked()).ToLocalChecked()).FromMaybe(0);
} else {
width = Nan::To<int32_t>(info[0]).FromMaybe(0);
height = Nan::To<int32_t>(info[1]).FromMaybe(0);
}
int stride = canvas->stride();
double Bpp = static_cast<double>(stride) / canvas->getWidth();
int nBytes = static_cast<int>(Bpp * width * height + .5);
Local<ArrayBuffer> ab = ArrayBuffer::New(iso, nBytes);
Local<Object> arr;
if (canvas->backend()->getFormat() == CAIRO_FORMAT_RGB16_565)
arr = Uint16Array::New(ab, 0, nBytes / 2);
else
arr = Uint8ClampedArray::New(ab, 0, nBytes);
const int argc = 3;
Local<Value> argv[argc] = { arr, Nan::New(width), Nan::New(height) };
Local<Function> ctor = Nan::GetFunction(Nan::New(ImageData::constructor)).ToLocalChecked();
Local<Object> instance = Nan::NewInstance(ctor, argc, argv).ToLocalChecked();
info.GetReturnValue().Set(instance);
}
/*
* Take a transform matrix and return its components
* 0: angle, 1: scaleX, 2: scaleY, 3: skewX, 4: translateX, 5: translateY
*/
void decompose_matrix(cairo_matrix_t matrix, double *destination) {
double denom = pow(matrix.xx, 2) + pow(matrix.yx, 2);
destination[0] = atan2(matrix.yx, matrix.xx);
destination[1] = sqrt(denom);
destination[2] = (matrix.xx * matrix.yy - matrix.xy * matrix.yx) / destination[1];
destination[3] = atan2(matrix.xx * matrix.xy + matrix.yx * matrix.yy, denom);
destination[4] = matrix.x0;
destination[5] = matrix.y0;
}
/*
* Draw image src image to the destination (context).
*
* - dx, dy
* - dx, dy, dw, dh
* - sx, sy, sw, sh, dx, dy, dw, dh
*
*/
NAN_METHOD(Context2d::DrawImage) {
int infoLen = info.Length();
if (infoLen != 3 && infoLen != 5 && infoLen != 9)
return Nan::ThrowTypeError("Invalid arguments");
if (!info[0]->IsObject())
return Nan::ThrowTypeError("The first argument must be an object");
double args[8];
if(!checkArgs(info, args, infoLen - 1, 1))
return;
double sx = 0
, sy = 0
, sw = 0
, sh = 0
, dx = 0
, dy = 0
, dw = 0
, dh = 0
, source_w = 0
, source_h = 0;
cairo_surface_t *surface;
Local<Object> obj = Nan::To<Object>(info[0]).ToLocalChecked();
// Image
if (Nan::New(Image::constructor)->HasInstance(obj)) {
Image *img = Nan::ObjectWrap::Unwrap<Image>(obj);
if (!img->isComplete()) {
return Nan::ThrowError("Image given has not completed loading");
}
source_w = sw = img->width;
source_h = sh = img->height;
surface = img->surface();
// Canvas
} else if (Nan::New(Canvas::constructor)->HasInstance(obj)) {
Canvas *canvas = Nan::ObjectWrap::Unwrap<Canvas>(obj);
source_w = sw = canvas->getWidth();
source_h = sh = canvas->getHeight();
surface = canvas->surface();
// Invalid
} else {
return Nan::ThrowTypeError("Image or Canvas expected");
}
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
// Arguments
switch (infoLen) {
// img, sx, sy, sw, sh, dx, dy, dw, dh
case 9:
sx = args[0];
sy = args[1];
sw = args[2];
sh = args[3];
dx = args[4];
dy = args[5];
dw = args[6];
dh = args[7];
break;
// img, dx, dy, dw, dh
case 5:
dx = args[0];
dy = args[1];
dw = args[2];
dh = args[3];
break;
// img, dx, dy
case 3:
dx = args[0];
dy = args[1];
dw = sw;
dh = sh;
break;
}
if (!(sw && sh && dw && dh))
return;
// Start draw
cairo_save(ctx);
cairo_matrix_t matrix;
double transforms[6];
cairo_get_matrix(context->context(), &matrix);
decompose_matrix(matrix, transforms);
// extract the scale value from the current transform so that we know how many pixels we
// need for our extra canvas in the drawImage operation.
double current_scale_x = std::abs(transforms[1]);
double current_scale_y = std::abs(transforms[2]);
double extra_dx = 0;
double extra_dy = 0;
double fx = dw / sw * current_scale_x; // transforms[1] is scale on X
double fy = dh / sh * current_scale_y; // transforms[2] is scale on X
bool needScale = dw != sw || dh != sh;
bool needCut = sw != source_w || sh != source_h || sx < 0 || sy < 0;
bool sameCanvas = surface == context->canvas()->surface();
bool needsExtraSurface = sameCanvas || needCut || needScale;
cairo_surface_t *surfTemp = NULL;
cairo_t *ctxTemp = NULL;
if (needsExtraSurface) {
// we want to create the extra surface as small as possible.
// fx and fy are the total scaling we need to apply to sw, sh.
// from sw and sh we want to remove the part that is outside the source_w and soruce_h
double real_w = sw;
double real_h = sh;
double translate_x = 0;
double translate_y = 0;
// if sx or sy are negative, a part of the area represented by sw and sh is empty
// because there are empty pixels, so we cut it out.
// On the other hand if sx or sy are positive, but sw and sh extend outside the real
// source pixels, we cut the area in that case too.
if (sx < 0) {
extra_dx = -sx * fx;
real_w = sw + sx;
} else if (sx + sw > source_w) {
real_w = sw - (sx + sw - source_w);
}
if (sy < 0) {
extra_dy = -sy * fy;
real_h = sh + sy;
} else if (sy + sh > source_h) {
real_h = sh - (sy + sh - source_h);
}
// if after cutting we are still bigger than source pixels, we restrict again
if (real_w > source_w) {
real_w = source_w;
}
if (real_h > source_h) {
real_h = source_h;
}
// TODO: find a way to limit the surfTemp to real_w and real_h if fx and fy are bigger than 1.
// there are no more pixel than the one available in the source, no need to create a bigger surface.
surfTemp = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, round(real_w * fx), round(real_h * fy));
ctxTemp = cairo_create(surfTemp);
cairo_scale(ctxTemp, fx, fy);
if (sx > 0) {
translate_x = sx;
}
if (sy > 0) {
translate_y = sy;
}
cairo_set_source_surface(ctxTemp, surface, -translate_x, -translate_y);
cairo_pattern_set_filter(cairo_get_source(ctxTemp), context->state->imageSmoothingEnabled ? context->state->patternQuality : CAIRO_FILTER_NEAREST);
cairo_pattern_set_extend(cairo_get_source(ctxTemp), CAIRO_EXTEND_REFLECT);
cairo_paint_with_alpha(ctxTemp, 1);
surface = surfTemp;
}
// apply shadow if there is one
if (context->hasShadow()) {
if(context->state->shadowBlur) {
// we need to create a new surface in order to blur
int pad = context->state->shadowBlur * 2;
cairo_surface_t *shadow_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, dw + 2 * pad, dh + 2 * pad);
cairo_t *shadow_context = cairo_create(shadow_surface);
// mask and blur
context->setSourceRGBA(shadow_context, context->state->shadow);
cairo_mask_surface(shadow_context, surface, pad, pad);
context->blur(shadow_surface, context->state->shadowBlur);
// paint
// @note: ShadowBlur looks different in each browser. This implementation matches chrome as close as possible.
// The 1.4 offset comes from visual tests with Chrome. I have read the spec and part of the shadowBlur
// implementation, and its not immediately clear why an offset is necessary, but without it, the result
// in chrome is different.
cairo_set_source_surface(ctx, shadow_surface,
dx + context->state->shadowOffsetX - pad + 1.4,
dy + context->state->shadowOffsetY - pad + 1.4);
cairo_paint(ctx);
// cleanup
cairo_destroy(shadow_context);
cairo_surface_destroy(shadow_surface);
} else {
context->setSourceRGBA(context->state->shadow);
cairo_mask_surface(ctx, surface,
dx + (context->state->shadowOffsetX),
dy + (context->state->shadowOffsetY));
}
}
double scaled_dx = dx;
double scaled_dy = dy;
if (needsExtraSurface && (current_scale_x != 1 || current_scale_y != 1)) {
// in this case our surface contains already current_scale_x, we need to scale back
cairo_scale(ctx, 1 / current_scale_x, 1 / current_scale_y);
scaled_dx *= current_scale_x;
scaled_dy *= current_scale_y;
}
// Paint
cairo_set_source_surface(ctx, surface, scaled_dx + extra_dx, scaled_dy + extra_dy);
cairo_pattern_set_filter(cairo_get_source(ctx), context->state->imageSmoothingEnabled ? context->state->patternQuality : CAIRO_FILTER_NEAREST);
cairo_pattern_set_extend(cairo_get_source(ctx), CAIRO_EXTEND_NONE);
cairo_paint_with_alpha(ctx, context->state->globalAlpha);
cairo_restore(ctx);
if (needsExtraSurface) {
cairo_destroy(ctxTemp);
cairo_surface_destroy(surfTemp);
}
}
/*
* Get global alpha.
*/
NAN_GETTER(Context2d::GetGlobalAlpha) {
CHECK_RECEIVER(Context2d.GetGlobalAlpha);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->globalAlpha));
}
/*
* Set global alpha.
*/
NAN_SETTER(Context2d::SetGlobalAlpha) {
CHECK_RECEIVER(Context2d.SetGlobalAlpha);
double n = Nan::To<double>(value).FromMaybe(0);
if (n >= 0 && n <= 1) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->globalAlpha = n;
}
}
/*
* Get global composite operation.
*/
NAN_GETTER(Context2d::GetGlobalCompositeOperation) {
CHECK_RECEIVER(Context2d.GetGlobalCompositeOperation);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
const char *op = "source-over";
switch (cairo_get_operator(ctx)) {
// composite modes:
case CAIRO_OPERATOR_CLEAR: op = "clear"; break;
case CAIRO_OPERATOR_SOURCE: op = "copy"; break;
case CAIRO_OPERATOR_DEST: op = "destination"; break;
case CAIRO_OPERATOR_OVER: op = "source-over"; break;
case CAIRO_OPERATOR_DEST_OVER: op = "destination-over"; break;
case CAIRO_OPERATOR_IN: op = "source-in"; break;
case CAIRO_OPERATOR_DEST_IN: op = "destination-in"; break;
case CAIRO_OPERATOR_OUT: op = "source-out"; break;
case CAIRO_OPERATOR_DEST_OUT: op = "destination-out"; break;
case CAIRO_OPERATOR_ATOP: op = "source-atop"; break;
case CAIRO_OPERATOR_DEST_ATOP: op = "destination-atop"; break;
case CAIRO_OPERATOR_XOR: op = "xor"; break;
case CAIRO_OPERATOR_ADD: op = "lighter"; break;
// blend modes:
// Note: "source-over" and "normal" are synonyms. Chrome and FF both report
// "source-over" after setting gCO to "normal".
// case CAIRO_OPERATOR_OVER: op = "normal";
case CAIRO_OPERATOR_MULTIPLY: op = "multiply"; break;
case CAIRO_OPERATOR_SCREEN: op = "screen"; break;
case CAIRO_OPERATOR_OVERLAY: op = "overlay"; break;
case CAIRO_OPERATOR_DARKEN: op = "darken"; break;
case CAIRO_OPERATOR_LIGHTEN: op = "lighten"; break;
case CAIRO_OPERATOR_COLOR_DODGE: op = "color-dodge"; break;
case CAIRO_OPERATOR_COLOR_BURN: op = "color-burn"; break;
case CAIRO_OPERATOR_HARD_LIGHT: op = "hard-light"; break;
case CAIRO_OPERATOR_SOFT_LIGHT: op = "soft-light"; break;
case CAIRO_OPERATOR_DIFFERENCE: op = "difference"; break;
case CAIRO_OPERATOR_EXCLUSION: op = "exclusion"; break;
case CAIRO_OPERATOR_HSL_HUE: op = "hue"; break;
case CAIRO_OPERATOR_HSL_SATURATION: op = "saturation"; break;
case CAIRO_OPERATOR_HSL_COLOR: op = "color"; break;
case CAIRO_OPERATOR_HSL_LUMINOSITY: op = "luminosity"; break;
// non-standard:
case CAIRO_OPERATOR_SATURATE: op = "saturate"; break;
}
info.GetReturnValue().Set(Nan::New(op).ToLocalChecked());
}
/*
* Set pattern quality.
*/
NAN_SETTER(Context2d::SetPatternQuality) {
CHECK_RECEIVER(Context2d.SetPatternQuality);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Nan::Utf8String quality(Nan::To<String>(value).ToLocalChecked());
if (0 == strcmp("fast", *quality)) {
context->state->patternQuality = CAIRO_FILTER_FAST;
} else if (0 == strcmp("good", *quality)) {
context->state->patternQuality = CAIRO_FILTER_GOOD;
} else if (0 == strcmp("best", *quality)) {
context->state->patternQuality = CAIRO_FILTER_BEST;
} else if (0 == strcmp("nearest", *quality)) {
context->state->patternQuality = CAIRO_FILTER_NEAREST;
} else if (0 == strcmp("bilinear", *quality)) {
context->state->patternQuality = CAIRO_FILTER_BILINEAR;
}
}
/*
* Get pattern quality.
*/
NAN_GETTER(Context2d::GetPatternQuality) {
CHECK_RECEIVER(Context2d.GetPatternQuality);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *quality;
switch (context->state->patternQuality) {
case CAIRO_FILTER_FAST: quality = "fast"; break;
case CAIRO_FILTER_BEST: quality = "best"; break;
case CAIRO_FILTER_NEAREST: quality = "nearest"; break;
case CAIRO_FILTER_BILINEAR: quality = "bilinear"; break;
default: quality = "good";
}
info.GetReturnValue().Set(Nan::New(quality).ToLocalChecked());
}
/*
* Set ImageSmoothingEnabled value.
*/
NAN_SETTER(Context2d::SetImageSmoothingEnabled) {
CHECK_RECEIVER(Context2d.SetImageSmoothingEnabled);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->imageSmoothingEnabled = Nan::To<bool>(value).FromMaybe(false);
}
/*
* Get pattern quality.
*/
NAN_GETTER(Context2d::GetImageSmoothingEnabled) {
CHECK_RECEIVER(Context2d.GetImageSmoothingEnabled);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Boolean>(context->state->imageSmoothingEnabled));
}
/*
* Set global composite operation.
*/
NAN_SETTER(Context2d::SetGlobalCompositeOperation) {
CHECK_RECEIVER(Context2d.SetGlobalCompositeOperation);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
Nan::Utf8String opStr(Nan::To<String>(value).ToLocalChecked()); // Unlike CSS colors, this *is* case-sensitive
const std::map<std::string, cairo_operator_t> blendmodes = {
// composite modes:
{"clear", CAIRO_OPERATOR_CLEAR},
{"copy", CAIRO_OPERATOR_SOURCE},
{"destination", CAIRO_OPERATOR_DEST}, // this seems to have been omitted from the spec
{"source-over", CAIRO_OPERATOR_OVER},
{"destination-over", CAIRO_OPERATOR_DEST_OVER},
{"source-in", CAIRO_OPERATOR_IN},
{"destination-in", CAIRO_OPERATOR_DEST_IN},
{"source-out", CAIRO_OPERATOR_OUT},
{"destination-out", CAIRO_OPERATOR_DEST_OUT},
{"source-atop", CAIRO_OPERATOR_ATOP},
{"destination-atop", CAIRO_OPERATOR_DEST_ATOP},
{"xor", CAIRO_OPERATOR_XOR},
{"lighter", CAIRO_OPERATOR_ADD},
// blend modes:
{"normal", CAIRO_OPERATOR_OVER},
{"multiply", CAIRO_OPERATOR_MULTIPLY},
{"screen", CAIRO_OPERATOR_SCREEN},
{"overlay", CAIRO_OPERATOR_OVERLAY},
{"darken", CAIRO_OPERATOR_DARKEN},
{"lighten", CAIRO_OPERATOR_LIGHTEN},
{"color-dodge", CAIRO_OPERATOR_COLOR_DODGE},
{"color-burn", CAIRO_OPERATOR_COLOR_BURN},
{"hard-light", CAIRO_OPERATOR_HARD_LIGHT},
{"soft-light", CAIRO_OPERATOR_SOFT_LIGHT},
{"difference", CAIRO_OPERATOR_DIFFERENCE},
{"exclusion", CAIRO_OPERATOR_EXCLUSION},
{"hue", CAIRO_OPERATOR_HSL_HUE},
{"saturation", CAIRO_OPERATOR_HSL_SATURATION},
{"color", CAIRO_OPERATOR_HSL_COLOR},
{"luminosity", CAIRO_OPERATOR_HSL_LUMINOSITY},
// non-standard:
{"saturate", CAIRO_OPERATOR_SATURATE}
};
auto op = blendmodes.find(*opStr);
if (op != blendmodes.end()) cairo_set_operator(ctx, op->second);
}
/*
* Get shadow offset x.
*/
NAN_GETTER(Context2d::GetShadowOffsetX) {
CHECK_RECEIVER(Context2d.GetShadowOffsetX);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->shadowOffsetX));
}
/*
* Set shadow offset x.
*/
NAN_SETTER(Context2d::SetShadowOffsetX) {
CHECK_RECEIVER(Context2d.SetShadowOffsetX);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadowOffsetX = Nan::To<double>(value).FromMaybe(0);
}
/*
* Get shadow offset y.
*/
NAN_GETTER(Context2d::GetShadowOffsetY) {
CHECK_RECEIVER(Context2d.GetShadowOffsetY);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->shadowOffsetY));
}
/*
* Set shadow offset y.
*/
NAN_SETTER(Context2d::SetShadowOffsetY) {
CHECK_RECEIVER(Context2d.SetShadowOffsetY);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadowOffsetY = Nan::To<double>(value).FromMaybe(0);
}
/*
* Get shadow blur.
*/
NAN_GETTER(Context2d::GetShadowBlur) {
CHECK_RECEIVER(Context2d.GetShadowBlur);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->shadowBlur));
}
/*
* Set shadow blur.
*/
NAN_SETTER(Context2d::SetShadowBlur) {
CHECK_RECEIVER(Context2d.SetShadowBlur);
int n = Nan::To<double>(value).FromMaybe(0);
if (n >= 0) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadowBlur = n;
}
}
/*
* Get current antialiasing setting.
*/
NAN_GETTER(Context2d::GetAntiAlias) {
CHECK_RECEIVER(Context2d.GetAntiAlias);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *aa;
switch (cairo_get_antialias(context->context())) {
case CAIRO_ANTIALIAS_NONE: aa = "none"; break;
case CAIRO_ANTIALIAS_GRAY: aa = "gray"; break;
case CAIRO_ANTIALIAS_SUBPIXEL: aa = "subpixel"; break;
default: aa = "default";
}
info.GetReturnValue().Set(Nan::New(aa).ToLocalChecked());
}
/*
* Set antialiasing.
*/
NAN_SETTER(Context2d::SetAntiAlias) {
CHECK_RECEIVER(Context2d.SetAntiAlias);
Nan::Utf8String str(Nan::To<String>(value).ToLocalChecked());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
cairo_antialias_t a;
if (0 == strcmp("none", *str)) {
a = CAIRO_ANTIALIAS_NONE;
} else if (0 == strcmp("default", *str)) {
a = CAIRO_ANTIALIAS_DEFAULT;
} else if (0 == strcmp("gray", *str)) {
a = CAIRO_ANTIALIAS_GRAY;
} else if (0 == strcmp("subpixel", *str)) {
a = CAIRO_ANTIALIAS_SUBPIXEL;
} else {
a = cairo_get_antialias(ctx);
}
cairo_set_antialias(ctx, a);
}
/*
* Get text drawing mode.
*/
NAN_GETTER(Context2d::GetTextDrawingMode) {
CHECK_RECEIVER(Context2d.GetTextDrawingMode);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *mode;
if (context->state->textDrawingMode == TEXT_DRAW_PATHS) {
mode = "path";
} else if (context->state->textDrawingMode == TEXT_DRAW_GLYPHS) {
mode = "glyph";
} else {
mode = "unknown";
}
info.GetReturnValue().Set(Nan::New(mode).ToLocalChecked());
}
/*
* Set text drawing mode.
*/
NAN_SETTER(Context2d::SetTextDrawingMode) {
CHECK_RECEIVER(Context2d.SetTextDrawingMode);
Nan::Utf8String str(Nan::To<String>(value).ToLocalChecked());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (0 == strcmp("path", *str)) {
context->state->textDrawingMode = TEXT_DRAW_PATHS;
} else if (0 == strcmp("glyph", *str)) {
context->state->textDrawingMode = TEXT_DRAW_GLYPHS;
}
}
/*
* Get filter.
*/
NAN_GETTER(Context2d::GetQuality) {
CHECK_RECEIVER(Context2d.GetQuality);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *filter;
switch (cairo_pattern_get_filter(cairo_get_source(context->context()))) {
case CAIRO_FILTER_FAST: filter = "fast"; break;
case CAIRO_FILTER_BEST: filter = "best"; break;
case CAIRO_FILTER_NEAREST: filter = "nearest"; break;
case CAIRO_FILTER_BILINEAR: filter = "bilinear"; break;
default: filter = "good";
}
info.GetReturnValue().Set(Nan::New(filter).ToLocalChecked());
}
/*
* Set filter.
*/
NAN_SETTER(Context2d::SetQuality) {
CHECK_RECEIVER(Context2d.SetQuality);
Nan::Utf8String str(Nan::To<String>(value).ToLocalChecked());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_filter_t filter;
if (0 == strcmp("fast", *str)) {
filter = CAIRO_FILTER_FAST;
} else if (0 == strcmp("best", *str)) {
filter = CAIRO_FILTER_BEST;
} else if (0 == strcmp("nearest", *str)) {
filter = CAIRO_FILTER_NEAREST;
} else if (0 == strcmp("bilinear", *str)) {
filter = CAIRO_FILTER_BILINEAR;
} else {
filter = CAIRO_FILTER_GOOD;
}
cairo_pattern_set_filter(cairo_get_source(context->context()), filter);
}
/*
* Helper for get current transform matrix
*/
Local<Object>
get_current_transform(Context2d *context) {
Isolate *iso = Isolate::GetCurrent();
Local<Float64Array> arr = Float64Array::New(ArrayBuffer::New(iso, 48), 0, 6);
Nan::TypedArrayContents<double> dest(arr);
cairo_matrix_t matrix;
cairo_get_matrix(context->context(), &matrix);
(*dest)[0] = matrix.xx;
(*dest)[1] = matrix.yx;
(*dest)[2] = matrix.xy;
(*dest)[3] = matrix.yy;
(*dest)[4] = matrix.x0;
(*dest)[5] = matrix.y0;
const int argc = 1;
Local<Value> argv[argc] = { arr };
return Nan::NewInstance(context->_DOMMatrix.Get(iso), argc, argv).ToLocalChecked();
}
/*
* Helper for get/set transform.
*/
void parse_matrix_from_object(cairo_matrix_t &matrix, Local<Object> mat) {
cairo_matrix_init(&matrix,
Nan::To<double>(Nan::Get(mat, Nan::New("a").ToLocalChecked()).ToLocalChecked()).FromMaybe(0),
Nan::To<double>(Nan::Get(mat, Nan::New("b").ToLocalChecked()).ToLocalChecked()).FromMaybe(0),
Nan::To<double>(Nan::Get(mat, Nan::New("c").ToLocalChecked()).ToLocalChecked()).FromMaybe(0),
Nan::To<double>(Nan::Get(mat, Nan::New("d").ToLocalChecked()).ToLocalChecked()).FromMaybe(0),
Nan::To<double>(Nan::Get(mat, Nan::New("e").ToLocalChecked()).ToLocalChecked()).FromMaybe(0),
Nan::To<double>(Nan::Get(mat, Nan::New("f").ToLocalChecked()).ToLocalChecked()).FromMaybe(0)
);
}
/*
* Get current transform.
*/
NAN_GETTER(Context2d::GetCurrentTransform) {
CHECK_RECEIVER(Context2d.GetCurrentTransform);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Local<Object> instance = get_current_transform(context);
info.GetReturnValue().Set(instance);
}
/*
* Set current transform.
*/
NAN_SETTER(Context2d::SetCurrentTransform) {
CHECK_RECEIVER(Context2d.SetCurrentTransform);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Local<Context> ctx = Nan::GetCurrentContext();
Local<Object> mat = Nan::To<Object>(value).ToLocalChecked();
#if NODE_MAJOR_VERSION >= 8
if (!mat->InstanceOf(ctx, _DOMMatrix.Get(Isolate::GetCurrent())).ToChecked()) {
return Nan::ThrowTypeError("Expected DOMMatrix");
}
#endif
cairo_matrix_t matrix;
parse_matrix_from_object(matrix, mat);
cairo_transform(context->context(), &matrix);
}
/*
* Get current fill style.
*/
NAN_GETTER(Context2d::GetFillStyle) {
CHECK_RECEIVER(Context2d.GetFillStyle);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Isolate *iso = Isolate::GetCurrent();
Local<Value> style;
if (context->_fillStyle.IsEmpty())
style = context->_getFillColor();
else
style = context->_fillStyle.Get(iso);
info.GetReturnValue().Set(style);
}
/*
* Set current fill style.
*/
NAN_SETTER(Context2d::SetFillStyle) {
CHECK_RECEIVER(Context2d.SetFillStyle);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (value->IsString()) {
MaybeLocal<String> mstr = Nan::To<String>(value);
if (mstr.IsEmpty()) return;
Local<String> str = mstr.ToLocalChecked();
context->_fillStyle.Reset();
context->_setFillColor(str);
} else if (value->IsObject()) {
Local<Object> obj = Nan::To<Object>(value).ToLocalChecked();
if (Nan::New(Gradient::constructor)->HasInstance(obj)) {
context->_fillStyle.Reset(value);
Gradient *grad = Nan::ObjectWrap::Unwrap<Gradient>(obj);
context->state->fillGradient = grad->pattern();
} else if (Nan::New(Pattern::constructor)->HasInstance(obj)) {
context->_fillStyle.Reset(value);
Pattern *pattern = Nan::ObjectWrap::Unwrap<Pattern>(obj);
context->state->fillPattern = pattern->pattern();
}
}
}
/*
* Get current stroke style.
*/
NAN_GETTER(Context2d::GetStrokeStyle) {
CHECK_RECEIVER(Context2d.GetStrokeStyle);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Local<Value> style;
if (context->_strokeStyle.IsEmpty())
style = context->_getStrokeColor();
else
style = context->_strokeStyle.Get(Isolate::GetCurrent());
info.GetReturnValue().Set(style);
}
/*
* Set current stroke style.
*/
NAN_SETTER(Context2d::SetStrokeStyle) {
CHECK_RECEIVER(Context2d.SetStrokeStyle);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (value->IsString()) {
MaybeLocal<String> mstr = Nan::To<String>(value);
if (mstr.IsEmpty()) return;
Local<String> str = mstr.ToLocalChecked();
context->_strokeStyle.Reset();
context->_setStrokeColor(str);
} else if (value->IsObject()) {
Local<Object> obj = Nan::To<Object>(value).ToLocalChecked();
if (Nan::New(Gradient::constructor)->HasInstance(obj)) {
context->_strokeStyle.Reset(value);
Gradient *grad = Nan::ObjectWrap::Unwrap<Gradient>(obj);
context->state->strokeGradient = grad->pattern();
} else if (Nan::New(Pattern::constructor)->HasInstance(obj)) {
context->_strokeStyle.Reset(value);
Pattern *pattern = Nan::ObjectWrap::Unwrap<Pattern>(obj);
context->state->strokePattern = pattern->pattern();
}
}
}
/*
* Get miter limit.
*/
NAN_GETTER(Context2d::GetMiterLimit) {
CHECK_RECEIVER(Context2d.GetMiterLimit);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(cairo_get_miter_limit(context->context())));
}
/*
* Set miter limit.
*/
NAN_SETTER(Context2d::SetMiterLimit) {
CHECK_RECEIVER(Context2d.SetMiterLimit);
double n = Nan::To<double>(value).FromMaybe(0);
if (n > 0) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_set_miter_limit(context->context(), n);
}
}
/*
* Get line width.
*/
NAN_GETTER(Context2d::GetLineWidth) {
CHECK_RECEIVER(Context2d.GetLineWidth);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(cairo_get_line_width(context->context())));
}
/*
* Set line width.
*/
NAN_SETTER(Context2d::SetLineWidth) {
CHECK_RECEIVER(Context2d.SetLineWidth);
double n = Nan::To<double>(value).FromMaybe(0);
if (n > 0 && n != std::numeric_limits<double>::infinity()) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_set_line_width(context->context(), n);
}
}
/*
* Get line join.
*/
NAN_GETTER(Context2d::GetLineJoin) {
CHECK_RECEIVER(Context2d.GetLineJoin);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *join;
switch (cairo_get_line_join(context->context())) {
case CAIRO_LINE_JOIN_BEVEL: join = "bevel"; break;
case CAIRO_LINE_JOIN_ROUND: join = "round"; break;
default: join = "miter";
}
info.GetReturnValue().Set(Nan::New(join).ToLocalChecked());
}
/*
* Set line join.
*/
NAN_SETTER(Context2d::SetLineJoin) {
CHECK_RECEIVER(Context2d.SetLineJoin);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
Nan::Utf8String type(Nan::To<String>(value).ToLocalChecked());
if (0 == strcmp("round", *type)) {
cairo_set_line_join(ctx, CAIRO_LINE_JOIN_ROUND);
} else if (0 == strcmp("bevel", *type)) {
cairo_set_line_join(ctx, CAIRO_LINE_JOIN_BEVEL);
} else {
cairo_set_line_join(ctx, CAIRO_LINE_JOIN_MITER);
}
}
/*
* Get line cap.
*/
NAN_GETTER(Context2d::GetLineCap) {
CHECK_RECEIVER(Context2d.GetLineCap);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *cap;
switch (cairo_get_line_cap(context->context())) {
case CAIRO_LINE_CAP_ROUND: cap = "round"; break;
case CAIRO_LINE_CAP_SQUARE: cap = "square"; break;
default: cap = "butt";
}
info.GetReturnValue().Set(Nan::New(cap).ToLocalChecked());
}
/*
* Set line cap.
*/
NAN_SETTER(Context2d::SetLineCap) {
CHECK_RECEIVER(Context2d.SetLineCap);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
Nan::Utf8String type(Nan::To<String>(value).ToLocalChecked());
if (0 == strcmp("round", *type)) {
cairo_set_line_cap(ctx, CAIRO_LINE_CAP_ROUND);
} else if (0 == strcmp("square", *type)) {
cairo_set_line_cap(ctx, CAIRO_LINE_CAP_SQUARE);
} else {
cairo_set_line_cap(ctx, CAIRO_LINE_CAP_BUTT);
}
}
/*
* Check if the given point is within the current path.
*/
NAN_METHOD(Context2d::IsPointInPath) {
if (info[0]->IsNumber() && info[1]->IsNumber()) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double x = Nan::To<double>(info[0]).FromMaybe(0)
, y = Nan::To<double>(info[1]).FromMaybe(0);
context->setFillRule(info[2]);
info.GetReturnValue().Set(Nan::New<Boolean>(cairo_in_fill(ctx, x, y) || cairo_in_stroke(ctx, x, y)));
return;
}
info.GetReturnValue().Set(Nan::False());
}
/*
* Set shadow color.
*/
NAN_SETTER(Context2d::SetShadowColor) {
CHECK_RECEIVER(Context2d.SetShadowColor);
short ok;
Nan::Utf8String str(Nan::To<String>(value).ToLocalChecked());
uint32_t rgba = rgba_from_string(*str, &ok);
if (ok) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadow = rgba_create(rgba);
}
}
/*
* Get shadow color.
*/
NAN_GETTER(Context2d::GetShadowColor) {
CHECK_RECEIVER(Context2d.GetShadowColor);
char buf[64];
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
rgba_to_string(context->state->shadow, buf, sizeof(buf));
info.GetReturnValue().Set(Nan::New<String>(buf).ToLocalChecked());
}
/*
* Set fill color, used internally for fillStyle=
*/
void Context2d::_setFillColor(Local<Value> arg) {
short ok;
Nan::Utf8String str(arg);
uint32_t rgba = rgba_from_string(*str, &ok);
if (!ok) return;
state->fillPattern = state->fillGradient = NULL;
state->fill = rgba_create(rgba);
}
/*
* Get fill color.
*/
Local<Value> Context2d::_getFillColor() {
char buf[64];
rgba_to_string(state->fill, buf, sizeof(buf));
return Nan::New<String>(buf).ToLocalChecked();
}
/*
* Set stroke color, used internally for strokeStyle=
*/
void Context2d::_setStrokeColor(Local<Value> arg) {
short ok;
Nan::Utf8String str(arg);
uint32_t rgba = rgba_from_string(*str, &ok);
if (!ok) return;
state->strokePattern = state->strokeGradient = NULL;
state->stroke = rgba_create(rgba);
}
/*
* Get stroke color.
*/
Local<Value> Context2d::_getStrokeColor() {
char buf[64];
rgba_to_string(state->stroke, buf, sizeof(buf));
return Nan::New<String>(buf).ToLocalChecked();
}
NAN_METHOD(Context2d::CreatePattern) {
Local<Value> image = info[0];
Local<Value> repetition = info[1];
if (!Nan::To<bool>(repetition).FromMaybe(false))
repetition = Nan::New("repeat").ToLocalChecked();
const int argc = 2;
Local<Value> argv[argc] = { image, repetition };
Local<Function> ctor = Nan::GetFunction(Nan::New(Pattern::constructor)).ToLocalChecked();
Local<Object> instance = Nan::NewInstance(ctor, argc, argv).ToLocalChecked();
info.GetReturnValue().Set(instance);
}
NAN_METHOD(Context2d::CreateLinearGradient) {
const int argc = 4;
Local<Value> argv[argc] = { info[0], info[1], info[2], info[3] };
Local<Function> ctor = Nan::GetFunction(Nan::New(Gradient::constructor)).ToLocalChecked();
Local<Object> instance = Nan::NewInstance(ctor, argc, argv).ToLocalChecked();
info.GetReturnValue().Set(instance);
}
NAN_METHOD(Context2d::CreateRadialGradient) {
const int argc = 6;
Local<Value> argv[argc] = { info[0], info[1], info[2], info[3], info[4], info[5] };
Local<Function> ctor = Nan::GetFunction(Nan::New(Gradient::constructor)).ToLocalChecked();
Local<Object> instance = Nan::NewInstance(ctor, argc, argv).ToLocalChecked();
info.GetReturnValue().Set(instance);
}
/*
* Bezier curve.
*/
NAN_METHOD(Context2d::BezierCurveTo) {
double args[6];
if(!checkArgs(info, args, 6))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_curve_to(context->context()
, args[0]
, args[1]
, args[2]
, args[3]
, args[4]
, args[5]);
}
/*
* Quadratic curve approximation from libsvg-cairo.
*/
NAN_METHOD(Context2d::QuadraticCurveTo) {
double args[4];
if(!checkArgs(info, args, 4))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double x, y
, x1 = args[0]
, y1 = args[1]
, x2 = args[2]
, y2 = args[3];
cairo_get_current_point(ctx, &x, &y);
if (0 == x && 0 == y) {
x = x1;
y = y1;
}
cairo_curve_to(ctx
, x + 2.0 / 3.0 * (x1 - x), y + 2.0 / 3.0 * (y1 - y)
, x2 + 2.0 / 3.0 * (x1 - x2), y2 + 2.0 / 3.0 * (y1 - y2)
, x2
, y2);
}
/*
* Save state.
*/
NAN_METHOD(Context2d::Save) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->save();
}
/*
* Restore state.
*/
NAN_METHOD(Context2d::Restore) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->restore();
}
/*
* Creates a new subpath.
*/
NAN_METHOD(Context2d::BeginPath) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_new_path(context->context());
}
/*
* Marks the subpath as closed.
*/
NAN_METHOD(Context2d::ClosePath) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_close_path(context->context());
}
/*
* Rotate transformation.
*/
NAN_METHOD(Context2d::Rotate) {
double args[1];
if(!checkArgs(info, args, 1))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_rotate(context->context(), args[0]);
}
/*
* Modify the CTM.
*/
NAN_METHOD(Context2d::Transform) {
double args[6];
if(!checkArgs(info, args, 6))
return;
cairo_matrix_t matrix;
cairo_matrix_init(&matrix
, args[0]
, args[1]
, args[2]
, args[3]
, args[4]
, args[5]);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_transform(context->context(), &matrix);
}
/*
* Get the CTM
*/
NAN_METHOD(Context2d::GetTransform) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Local<Object> instance = get_current_transform(context);
info.GetReturnValue().Set(instance);
}
/*
* Reset the CTM, used internally by setTransform().
*/
NAN_METHOD(Context2d::ResetTransform) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_identity_matrix(context->context());
}
/*
* Reset transform matrix to identity, then apply the given args.
*/
NAN_METHOD(Context2d::SetTransform) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (info.Length() == 1) {
Local<Object> mat = Nan::To<Object>(info[0]).ToLocalChecked();
#if NODE_MAJOR_VERSION >= 8
Local<Context> ctx = Nan::GetCurrentContext();
if (!mat->InstanceOf(ctx, _DOMMatrix.Get(Isolate::GetCurrent())).ToChecked()) {
return Nan::ThrowTypeError("Expected DOMMatrix");
}
#endif
cairo_matrix_t matrix;
parse_matrix_from_object(matrix, mat);
cairo_set_matrix(context->context(), &matrix);
} else {
cairo_identity_matrix(context->context());
Context2d::Transform(info);
}
}
/*
* Translate transformation.
*/
NAN_METHOD(Context2d::Translate) {
double args[2];
if(!checkArgs(info, args, 2))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_translate(context->context(), args[0], args[1]);
}
/*
* Scale transformation.
*/
NAN_METHOD(Context2d::Scale) {
double args[2];
if(!checkArgs(info, args, 2))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_scale(context->context(), args[0], args[1]);
}
/*
* Use path as clipping region.
*/
NAN_METHOD(Context2d::Clip) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->setFillRule(info[0]);
cairo_t *ctx = context->context();
cairo_clip_preserve(ctx);
}
/*
* Fill the path.
*/
NAN_METHOD(Context2d::Fill) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->setFillRule(info[0]);
context->fill(true);
}
/*
* Stroke the path.
*/
NAN_METHOD(Context2d::Stroke) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->stroke(true);
}
/*
* Helper for fillText/strokeText
*/
double
get_text_scale(PangoLayout *layout, double maxWidth) {
PangoRectangle logical_rect;
pango_layout_get_pixel_extents(layout, NULL, &logical_rect);
if (logical_rect.width > maxWidth) {
return maxWidth / logical_rect.width;
} else {
return 1.0;
}
}
void
paintText(const Nan::FunctionCallbackInfo<Value> &info, bool stroke) {
int argsNum = info.Length() >= 4 ? 3 : 2;
if (argsNum == 3 && info[3]->IsUndefined())
argsNum = 2;
double args[3];
if(!checkArgs(info, args, argsNum, 1))
return;
Nan::Utf8String str(Nan::To<String>(info[0]).ToLocalChecked());
double x = args[0];
double y = args[1];
double scaled_by = 1;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
PangoLayout *layout = context->layout();
pango_layout_set_text(layout, *str, -1);
pango_cairo_update_layout(context->context(), layout);
if (argsNum == 3) {
scaled_by = get_text_scale(layout, args[2]);
cairo_save(context->context());
cairo_scale(context->context(), scaled_by, 1);
}
context->savePath();
if (context->state->textDrawingMode == TEXT_DRAW_GLYPHS) {
if (stroke == true) { context->stroke(); } else { context->fill(); }
context->setTextPath(x / scaled_by, y);
} else if (context->state->textDrawingMode == TEXT_DRAW_PATHS) {
context->setTextPath(x / scaled_by, y);
if (stroke == true) { context->stroke(); } else { context->fill(); }
}
context->restorePath();
if (argsNum == 3) {
cairo_restore(context->context());
}
}
/*
* Fill text at (x, y).
*/
NAN_METHOD(Context2d::FillText) {
paintText(info, false);
}
/*
* Stroke text at (x ,y).
*/
NAN_METHOD(Context2d::StrokeText) {
paintText(info, true);
}
/*
* Gets the baseline adjustment in device pixels
*/
inline double getBaselineAdjustment(PangoLayout* layout, short baseline) {
PangoRectangle logical_rect;
pango_layout_line_get_extents(pango_layout_get_line(layout, 0), NULL, &logical_rect);
double scale = 1.0 / PANGO_SCALE;
double ascent = scale * pango_layout_get_baseline(layout);
double descent = scale * logical_rect.height - ascent;
switch (baseline) {
case TEXT_BASELINE_ALPHABETIC:
return ascent;
case TEXT_BASELINE_MIDDLE:
return (ascent + descent) / 2.0;
case TEXT_BASELINE_BOTTOM:
return ascent + descent;
default:
return 0;
}
}
/*
* Set text path for the string in the layout at (x, y).
* This function is called by paintText and won't behave correctly
* if is not called from there.
* it needs pango_layout_set_text and pango_cairo_update_layout to be called before
*/
void
Context2d::setTextPath(double x, double y) {
PangoRectangle logical_rect;
switch (state->textAlignment) {
case TEXT_ALIGNMENT_CENTER:
pango_layout_get_pixel_extents(_layout, NULL, &logical_rect);
x -= logical_rect.width / 2;
break;
case TEXT_ALIGNMENT_END:
case TEXT_ALIGNMENT_RIGHT:
pango_layout_get_pixel_extents(_layout, NULL, &logical_rect);
x -= logical_rect.width;
break;
}
y -= getBaselineAdjustment(_layout, state->textBaseline);
cairo_move_to(_context, x, y);
if (state->textDrawingMode == TEXT_DRAW_PATHS) {
pango_cairo_layout_path(_context, _layout);
} else if (state->textDrawingMode == TEXT_DRAW_GLYPHS) {
pango_cairo_show_layout(_context, _layout);
}
}
/*
* Adds a point to the current subpath.
*/
NAN_METHOD(Context2d::LineTo) {
double args[2];
if(!checkArgs(info, args, 2))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_line_to(context->context(), args[0], args[1]);
}
/*
* Creates a new subpath at the given point.
*/
NAN_METHOD(Context2d::MoveTo) {
double args[2];
if(!checkArgs(info, args, 2))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_move_to(context->context(), args[0], args[1]);
}
/*
* Get font.
*/
NAN_GETTER(Context2d::GetFont) {
CHECK_RECEIVER(Context2d.GetFont);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Isolate *iso = Isolate::GetCurrent();
Local<Value> font;
if (context->_font.IsEmpty())
font = Nan::New("10px sans-serif").ToLocalChecked();
else
font = context->_font.Get(iso);
info.GetReturnValue().Set(font);
}
/*
* Set font:
* - weight
* - style
* - size
* - unit
* - family
*/
NAN_SETTER(Context2d::SetFont) {
CHECK_RECEIVER(Context2d.SetFont);
if (!value->IsString()) return;
Isolate *iso = Isolate::GetCurrent();
Local<Context> ctx = Nan::GetCurrentContext();
Local<String> str = Nan::To<String>(value).ToLocalChecked();
if (!str->Length()) return;
const int argc = 1;
Local<Value> argv[argc] = { value };
Local<Value> mparsed = Nan::Call(_parseFont.Get(iso), ctx->Global(), argc, argv).ToLocalChecked();
// parseFont returns undefined for invalid CSS font strings
if (mparsed->IsUndefined()) return;
Local<Object> font = Nan::To<Object>(mparsed).ToLocalChecked();
Nan::Utf8String weight(Nan::Get(font, Nan::New("weight").ToLocalChecked()).ToLocalChecked());
Nan::Utf8String style(Nan::Get(font, Nan::New("style").ToLocalChecked()).ToLocalChecked());
double size = Nan::To<double>(Nan::Get(font, Nan::New("size").ToLocalChecked()).ToLocalChecked()).FromMaybe(0);
Nan::Utf8String unit(Nan::Get(font, Nan::New("unit").ToLocalChecked()).ToLocalChecked());
Nan::Utf8String family(Nan::Get(font, Nan::New("family").ToLocalChecked()).ToLocalChecked());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
PangoFontDescription *desc = pango_font_description_copy(context->state->fontDescription);
pango_font_description_free(context->state->fontDescription);
pango_font_description_set_style(desc, Canvas::GetStyleFromCSSString(*style));
pango_font_description_set_weight(desc, Canvas::GetWeightFromCSSString(*weight));
if (strlen(*family) > 0) {
// See #1643 - Pango understands "sans" whereas CSS uses "sans-serif"
std::string s1(*family);
std::string s2("sans-serif");
if (streq_casein(s1, s2)) {
pango_font_description_set_family(desc, "sans");
} else {
pango_font_description_set_family(desc, *family);
}
}
PangoFontDescription *sys_desc = Canvas::ResolveFontDescription(desc);
pango_font_description_free(desc);
if (size > 0) pango_font_description_set_absolute_size(sys_desc, size * PANGO_SCALE);
context->state->fontDescription = sys_desc;
pango_layout_set_font_description(context->_layout, sys_desc);
context->_font.Reset(value);
}
/*
* Get text baseline.
*/
NAN_GETTER(Context2d::GetTextBaseline) {
CHECK_RECEIVER(Context2d.GetTextBaseline);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char* baseline;
switch (context->state->textBaseline) {
default:
case TEXT_BASELINE_ALPHABETIC: baseline = "alphabetic"; break;
case TEXT_BASELINE_TOP: baseline = "top"; break;
case TEXT_BASELINE_BOTTOM: baseline = "bottom"; break;
case TEXT_BASELINE_MIDDLE: baseline = "middle"; break;
case TEXT_BASELINE_IDEOGRAPHIC: baseline = "ideographic"; break;
case TEXT_BASELINE_HANGING: baseline = "hanging"; break;
}
info.GetReturnValue().Set(Nan::New(baseline).ToLocalChecked());
}
/*
* Set text baseline.
*/
NAN_SETTER(Context2d::SetTextBaseline) {
CHECK_RECEIVER(Context2d.SetTextBaseline);
if (!value->IsString()) return;
Nan::Utf8String opStr(Nan::To<String>(value).ToLocalChecked());
const std::map<std::string, text_baseline_t> modes = {
{"alphabetic", TEXT_BASELINE_ALPHABETIC},
{"top", TEXT_BASELINE_TOP},
{"bottom", TEXT_BASELINE_BOTTOM},
{"middle", TEXT_BASELINE_MIDDLE},
{"ideographic", TEXT_BASELINE_IDEOGRAPHIC},
{"hanging", TEXT_BASELINE_HANGING}
};
auto op = modes.find(*opStr);
if (op == modes.end()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->textBaseline = op->second;
}
/*
* Get text align.
*/
NAN_GETTER(Context2d::GetTextAlign) {
CHECK_RECEIVER(Context2d.GetTextAlign);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char* align;
switch (context->state->textAlignment) {
default:
// TODO the default is supposed to be "start"
case TEXT_ALIGNMENT_LEFT: align = "left"; break;
case TEXT_ALIGNMENT_START: align = "start"; break;
case TEXT_ALIGNMENT_CENTER: align = "center"; break;
case TEXT_ALIGNMENT_RIGHT: align = "right"; break;
case TEXT_ALIGNMENT_END: align = "end"; break;
}
info.GetReturnValue().Set(Nan::New(align).ToLocalChecked());
}
/*
* Set text align.
*/
NAN_SETTER(Context2d::SetTextAlign) {
CHECK_RECEIVER(Context2d.SetTextAlign);
if (!value->IsString()) return;
Nan::Utf8String opStr(Nan::To<String>(value).ToLocalChecked());
const std::map<std::string, text_align_t> modes = {
{"center", TEXT_ALIGNMENT_CENTER},
{"left", TEXT_ALIGNMENT_LEFT},
{"start", TEXT_ALIGNMENT_START},
{"right", TEXT_ALIGNMENT_RIGHT},
{"end", TEXT_ALIGNMENT_END}
};
auto op = modes.find(*opStr);
if (op == modes.end()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->textAlignment = op->second;
}
/*
* Return the given text extents.
* TODO: Support for:
* hangingBaseline, ideographicBaseline,
* fontBoundingBoxAscent, fontBoundingBoxDescent
*/
NAN_METHOD(Context2d::MeasureText) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
Nan::Utf8String str(Nan::To<String>(info[0]).ToLocalChecked());
Local<Object> obj = Nan::New<Object>();
PangoRectangle _ink_rect, _logical_rect;
float_rectangle ink_rect, logical_rect;
PangoFontMetrics *metrics;
PangoLayout *layout = context->layout();
pango_layout_set_text(layout, *str, -1);
pango_cairo_update_layout(ctx, layout);
// Normally you could use pango_layout_get_pixel_extents and be done, or use
// pango_extents_to_pixels, but both of those round the pixels, so we have to
// divide by PANGO_SCALE manually
pango_layout_get_extents(layout, &_ink_rect, &_logical_rect);
float inverse_pango_scale = 1. / PANGO_SCALE;
logical_rect.x = _logical_rect.x * inverse_pango_scale;
logical_rect.y = _logical_rect.y * inverse_pango_scale;
logical_rect.width = _logical_rect.width * inverse_pango_scale;
logical_rect.height = _logical_rect.height * inverse_pango_scale;
ink_rect.x = _ink_rect.x * inverse_pango_scale;
ink_rect.y = _ink_rect.y * inverse_pango_scale;
ink_rect.width = _ink_rect.width * inverse_pango_scale;
ink_rect.height = _ink_rect.height * inverse_pango_scale;
metrics = PANGO_LAYOUT_GET_METRICS(layout);
double x_offset;
switch (context->state->textAlignment) {
case TEXT_ALIGNMENT_CENTER:
x_offset = logical_rect.width / 2.;
break;
case TEXT_ALIGNMENT_END:
case TEXT_ALIGNMENT_RIGHT:
x_offset = logical_rect.width;
break;
case TEXT_ALIGNMENT_START:
case TEXT_ALIGNMENT_LEFT:
default:
x_offset = 0.0;
}
cairo_matrix_t matrix;
cairo_get_matrix(ctx, &matrix);
double y_offset = getBaselineAdjustment(layout, context->state->textBaseline);
Nan::Set(obj,
Nan::New<String>("width").ToLocalChecked(),
Nan::New<Number>(logical_rect.width)).Check();
Nan::Set(obj,
Nan::New<String>("actualBoundingBoxLeft").ToLocalChecked(),
Nan::New<Number>(PANGO_LBEARING(ink_rect) + x_offset)).Check();
Nan::Set(obj,
Nan::New<String>("actualBoundingBoxRight").ToLocalChecked(),
Nan::New<Number>(PANGO_RBEARING(ink_rect) - x_offset)).Check();
Nan::Set(obj,
Nan::New<String>("actualBoundingBoxAscent").ToLocalChecked(),
Nan::New<Number>(y_offset + PANGO_ASCENT(ink_rect))).Check();
Nan::Set(obj,
Nan::New<String>("actualBoundingBoxDescent").ToLocalChecked(),
Nan::New<Number>(PANGO_DESCENT(ink_rect) - y_offset)).Check();
Nan::Set(obj,
Nan::New<String>("emHeightAscent").ToLocalChecked(),
Nan::New<Number>(-(PANGO_ASCENT(logical_rect) - y_offset))).Check();
Nan::Set(obj,
Nan::New<String>("emHeightDescent").ToLocalChecked(),
Nan::New<Number>(PANGO_DESCENT(logical_rect) - y_offset)).Check();
Nan::Set(obj,
Nan::New<String>("alphabeticBaseline").ToLocalChecked(),
Nan::New<Number>(-(pango_font_metrics_get_ascent(metrics) * inverse_pango_scale - y_offset))).Check();
pango_font_metrics_unref(metrics);
info.GetReturnValue().Set(obj);
}
/*
* Set line dash
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_METHOD(Context2d::SetLineDash) {
if (!info[0]->IsArray()) return;
Local<Array> dash = Local<Array>::Cast(info[0]);
uint32_t dashes = dash->Length() & 1 ? dash->Length() * 2 : dash->Length();
uint32_t zero_dashes = 0;
std::vector<double> a(dashes);
for (uint32_t i=0; i<dashes; i++) {
Local<Value> d = Nan::Get(dash, i % dash->Length()).ToLocalChecked();
if (!d->IsNumber()) return;
a[i] = Nan::To<double>(d).FromMaybe(0);
if (a[i] == 0) zero_dashes++;
if (a[i] < 0 || !std::isfinite(a[i])) return;
}
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double offset;
cairo_get_dash(ctx, NULL, &offset);
if (zero_dashes == dashes) {
std::vector<double> b(0);
cairo_set_dash(ctx, b.data(), 0, offset);
} else {
cairo_set_dash(ctx, a.data(), dashes, offset);
}
}
/*
* Get line dash
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_METHOD(Context2d::GetLineDash) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
int dashes = cairo_get_dash_count(ctx);
std::vector<double> a(dashes);
cairo_get_dash(ctx, a.data(), NULL);
Local<Array> dash = Nan::New<Array>(dashes);
for (int i=0; i<dashes; i++) {
Nan::Set(dash, Nan::New<Number>(i), Nan::New<Number>(a[i])).Check();
}
info.GetReturnValue().Set(dash);
}
/*
* Set line dash offset
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_SETTER(Context2d::SetLineDashOffset) {
CHECK_RECEIVER(Context2d.SetLineDashOffset);
double offset = Nan::To<double>(value).FromMaybe(0);
if (!std::isfinite(offset)) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
int dashes = cairo_get_dash_count(ctx);
std::vector<double> a(dashes);
cairo_get_dash(ctx, a.data(), NULL);
cairo_set_dash(ctx, a.data(), dashes, offset);
}
/*
* Get line dash offset
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_GETTER(Context2d::GetLineDashOffset) {
CHECK_RECEIVER(Context2d.GetLineDashOffset);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double offset;
cairo_get_dash(ctx, NULL, &offset);
info.GetReturnValue().Set(Nan::New<Number>(offset));
}
/*
* Fill the rectangle defined by x, y, width and height.
*/
NAN_METHOD(Context2d::FillRect) {
RECT_ARGS;
if (0 == width || 0 == height) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
context->savePath();
cairo_rectangle(ctx, x, y, width, height);
context->fill();
context->restorePath();
}
/*
* Stroke the rectangle defined by x, y, width and height.
*/
NAN_METHOD(Context2d::StrokeRect) {
RECT_ARGS;
if (0 == width && 0 == height) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
context->savePath();
cairo_rectangle(ctx, x, y, width, height);
context->stroke();
context->restorePath();
}
/*
* Clears all pixels defined by x, y, width and height.
*/
NAN_METHOD(Context2d::ClearRect) {
RECT_ARGS;
if (0 == width || 0 == height) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
cairo_save(ctx);
context->savePath();
cairo_rectangle(ctx, x, y, width, height);
cairo_set_operator(ctx, CAIRO_OPERATOR_CLEAR);
cairo_fill(ctx);
context->restorePath();
cairo_restore(ctx);
}
/*
* Adds a rectangle subpath.
*/
NAN_METHOD(Context2d::Rect) {
RECT_ARGS;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
if (width == 0) {
cairo_move_to(ctx, x, y);
cairo_line_to(ctx, x, y + height);
} else if (height == 0) {
cairo_move_to(ctx, x, y);
cairo_line_to(ctx, x + width, y);
} else {
cairo_rectangle(ctx, x, y, width, height);
}
}
// Draws an arc with two potentially different radii.
inline static
void elli_arc(cairo_t* ctx, double xc, double yc, double rx, double ry, double a1, double a2, bool clockwise=true) {
if (rx == 0. || ry == 0.) {
cairo_line_to(ctx, xc + rx, yc + ry);
} else {
cairo_save(ctx);
cairo_translate(ctx, xc, yc);
cairo_scale(ctx, rx, ry);
if (clockwise)
cairo_arc(ctx, 0., 0., 1., a1, a2);
else
cairo_arc_negative(ctx, 0., 0., 1., a2, a1);
cairo_restore(ctx);
}
}
inline static
bool getRadius(Point<double>& p, const Local<Value>& v) {
if (v->IsObject()) { // 5.1 DOMPointInit
auto rx = Nan::Get(v.As<Object>(), Nan::New("x").ToLocalChecked()).ToLocalChecked();
auto ry = Nan::Get(v.As<Object>(), Nan::New("y").ToLocalChecked()).ToLocalChecked();
if (rx->IsNumber() && ry->IsNumber()) {
auto rxv = Nan::To<double>(rx).FromJust();
auto ryv = Nan::To<double>(ry).FromJust();
if (!std::isfinite(rxv) || !std::isfinite(ryv))
return true;
if (rxv < 0 || ryv < 0) {
Nan::ThrowRangeError("radii must be positive.");
return true;
}
p.x = rxv;
p.y = ryv;
return false;
}
} else if (v->IsNumber()) { // 5.2 unrestricted double
auto rv = Nan::To<double>(v).FromJust();
if (!std::isfinite(rv))
return true;
if (rv < 0) {
Nan::ThrowRangeError("radii must be positive.");
return true;
}
p.x = p.y = rv;
return false;
}
return true;
}
/**
* https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-roundrect
* x, y, w, h, [radius|[radii]]
*/
NAN_METHOD(Context2d::RoundRect) {
RECT_ARGS;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
// 4. Let normalizedRadii be an empty list
Point<double> normalizedRadii[4];
size_t nRadii = 4;
if (info[4]->IsUndefined()) {
for (size_t i = 0; i < 4; i++)
normalizedRadii[i].x = normalizedRadii[i].y = 0.;
} else if (info[4]->IsArray()) {
auto radiiList = info[4].As<v8::Array>();
nRadii = radiiList->Length();
if (!(nRadii >= 1 && nRadii <= 4)) {
Nan::ThrowRangeError("radii must be a list of one, two, three or four radii.");
return;
}
// 5. For each radius of radii
for (size_t i = 0; i < nRadii; i++) {
auto r = Nan::Get(radiiList, i).ToLocalChecked();
if (getRadius(normalizedRadii[i], r))
return;
}
} else {
// 2. If radii is a double, then set radii to <<radii>>
if (getRadius(normalizedRadii[0], info[4]))
return;
for (size_t i = 1; i < 4; i++) {
normalizedRadii[i].x = normalizedRadii[0].x;
normalizedRadii[i].y = normalizedRadii[0].y;
}
}
Point<double> upperLeft, upperRight, lowerRight, lowerLeft;
if (nRadii == 4) {
upperLeft = normalizedRadii[0];
upperRight = normalizedRadii[1];
lowerRight = normalizedRadii[2];
lowerLeft = normalizedRadii[3];
} else if (nRadii == 3) {
upperLeft = normalizedRadii[0];
upperRight = normalizedRadii[1];
lowerLeft = normalizedRadii[1];
lowerRight = normalizedRadii[2];
} else if (nRadii == 2) {
upperLeft = normalizedRadii[0];
lowerRight = normalizedRadii[0];
upperRight = normalizedRadii[1];
lowerLeft = normalizedRadii[1];
} else {
upperLeft = normalizedRadii[0];
upperRight = normalizedRadii[0];
lowerRight = normalizedRadii[0];
lowerLeft = normalizedRadii[0];
}
bool clockwise = true;
if (width < 0) {
clockwise = false;
x += width;
width = -width;
std::swap(upperLeft, upperRight);
std::swap(lowerLeft, lowerRight);
}
if (height < 0) {
clockwise = !clockwise;
y += height;
height = -height;
std::swap(upperLeft, lowerLeft);
std::swap(upperRight, lowerRight);
}
// 11. Corner curves must not overlap. Scale radii to prevent this.
{
auto top = upperLeft.x + upperRight.x;
auto right = upperRight.y + lowerRight.y;
auto bottom = lowerRight.x + lowerLeft.x;
auto left = upperLeft.y + lowerLeft.y;
auto scale = std::min({ width / top, height / right, width / bottom, height / left });
if (scale < 1.) {
upperLeft.x *= scale;
upperLeft.y *= scale;
upperRight.x *= scale;
upperRight.x *= scale;
lowerLeft.y *= scale;
lowerLeft.y *= scale;
lowerRight.y *= scale;
lowerRight.y *= scale;
}
}
// 12. Draw
cairo_move_to(ctx, x + upperLeft.x, y);
if (clockwise) {
cairo_line_to(ctx, x + width - upperRight.x, y);
elli_arc(ctx, x + width - upperRight.x, y + upperRight.y, upperRight.x, upperRight.y, 3. * M_PI / 2., 0.);
cairo_line_to(ctx, x + width, y + height - lowerRight.y);
elli_arc(ctx, x + width - lowerRight.x, y + height - lowerRight.y, lowerRight.x, lowerRight.y, 0, M_PI / 2.);
cairo_line_to(ctx, x + lowerLeft.x, y + height);
elli_arc(ctx, x + lowerLeft.x, y + height - lowerLeft.y, lowerLeft.x, lowerLeft.y, M_PI / 2., M_PI);
cairo_line_to(ctx, x, y + upperLeft.y);
elli_arc(ctx, x + upperLeft.x, y + upperLeft.y, upperLeft.x, upperLeft.y, M_PI, 3. * M_PI / 2.);
} else {
elli_arc(ctx, x + upperLeft.x, y + upperLeft.y, upperLeft.x, upperLeft.y, M_PI, 3. * M_PI / 2., false);
cairo_line_to(ctx, x, y + upperLeft.y);
elli_arc(ctx, x + lowerLeft.x, y + height - lowerLeft.y, lowerLeft.x, lowerLeft.y, M_PI / 2., M_PI, false);
cairo_line_to(ctx, x + lowerLeft.x, y + height);
elli_arc(ctx, x + width - lowerRight.x, y + height - lowerRight.y, lowerRight.x, lowerRight.y, 0, M_PI / 2., false);
cairo_line_to(ctx, x + width, y + height - lowerRight.y);
elli_arc(ctx, x + width - upperRight.x, y + upperRight.y, upperRight.x, upperRight.y, 3. * M_PI / 2., 0., false);
cairo_line_to(ctx, x + width - upperRight.x, y);
}
cairo_close_path(ctx);
}
// Adapted from https://chromium.googlesource.com/chromium/blink/+/refs/heads/main/Source/modules/canvas2d/CanvasPathMethods.cpp
static void canonicalizeAngle(double& startAngle, double& endAngle) {
// Make 0 <= startAngle < 2*PI
double newStartAngle = std::fmod(startAngle, twoPi);
if (newStartAngle < 0) {
newStartAngle += twoPi;
// Check for possible catastrophic cancellation in cases where
// newStartAngle was a tiny negative number (c.f. crbug.com/503422)
if (newStartAngle >= twoPi)
newStartAngle -= twoPi;
}
double delta = newStartAngle - startAngle;
startAngle = newStartAngle;
endAngle = endAngle + delta;
}
// Adapted from https://chromium.googlesource.com/chromium/blink/+/refs/heads/main/Source/modules/canvas2d/CanvasPathMethods.cpp
static double adjustEndAngle(double startAngle, double endAngle, bool counterclockwise) {
double newEndAngle = endAngle;
/* http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-context-2d-arc
* If the counterclockwise argument is false and endAngle-startAngle is equal to or greater than 2pi, or,
* if the counterclockwise argument is true and startAngle-endAngle is equal to or greater than 2pi,
* then the arc is the whole circumference of this ellipse, and the point at startAngle along this circle's circumference,
* measured in radians clockwise from the ellipse's semi-major axis, acts as both the start point and the end point.
*/
if (!counterclockwise && endAngle - startAngle >= twoPi)
newEndAngle = startAngle + twoPi;
else if (counterclockwise && startAngle - endAngle >= twoPi)
newEndAngle = startAngle - twoPi;
/*
* Otherwise, the arc is the path along the circumference of this ellipse from the start point to the end point,
* going anti-clockwise if the counterclockwise argument is true, and clockwise otherwise.
* Since the points are on the ellipse, as opposed to being simply angles from zero,
* the arc can never cover an angle greater than 2pi radians.
*/
/* NOTE: When startAngle = 0, endAngle = 2Pi and counterclockwise = true, the spec does not indicate clearly.
* We draw the entire circle, because some web sites use arc(x, y, r, 0, 2*Math.PI, true) to draw circle.
* We preserve backward-compatibility.
*/
else if (!counterclockwise && startAngle > endAngle)
newEndAngle = startAngle + (twoPi - std::fmod(startAngle - endAngle, twoPi));
else if (counterclockwise && startAngle < endAngle)
newEndAngle = startAngle - (twoPi - std::fmod(endAngle - startAngle, twoPi));
return newEndAngle;
}
/*
* Adds an arc at x, y with the given radii and start/end angles.
*/
NAN_METHOD(Context2d::Arc) {
double args[5];
if(!checkArgs(info, args, 5))
return;
auto x = args[0];
auto y = args[1];
auto radius = args[2];
auto startAngle = args[3];
auto endAngle = args[4];
if (radius < 0) {
Nan::ThrowRangeError("The radius provided is negative.");
return;
}
bool counterclockwise = Nan::To<bool>(info[5]).FromMaybe(false);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
canonicalizeAngle(startAngle, endAngle);
endAngle = adjustEndAngle(startAngle, endAngle, counterclockwise);
if (counterclockwise) {
cairo_arc_negative(ctx, x, y, radius, startAngle, endAngle);
} else {
cairo_arc(ctx, x, y, radius, startAngle, endAngle);
}
}
/*
* Adds an arcTo point (x0,y0) to (x1,y1) with the given radius.
*
* Implementation influenced by WebKit.
*/
NAN_METHOD(Context2d::ArcTo) {
double args[5];
if(!checkArgs(info, args, 5))
return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
// Current path point
double x, y;
cairo_get_current_point(ctx, &x, &y);
Point<float> p0(x, y);
// Point (x0,y0)
Point<float> p1(args[0], args[1]);
// Point (x1,y1)
Point<float> p2(args[2], args[3]);
float radius = args[4];
if ((p1.x == p0.x && p1.y == p0.y)
|| (p1.x == p2.x && p1.y == p2.y)
|| radius == 0.f) {
cairo_line_to(ctx, p1.x, p1.y);
return;
}
Point<float> p1p0((p0.x - p1.x),(p0.y - p1.y));
Point<float> p1p2((p2.x - p1.x),(p2.y - p1.y));
float p1p0_length = sqrtf(p1p0.x * p1p0.x + p1p0.y * p1p0.y);
float p1p2_length = sqrtf(p1p2.x * p1p2.x + p1p2.y * p1p2.y);
double cos_phi = (p1p0.x * p1p2.x + p1p0.y * p1p2.y) / (p1p0_length * p1p2_length);
// all points on a line logic
if (-1 == cos_phi) {
cairo_line_to(ctx, p1.x, p1.y);
return;
}
if (1 == cos_phi) {
// add infinite far away point
unsigned int max_length = 65535;
double factor_max = max_length / p1p0_length;
Point<float> ep((p0.x + factor_max * p1p0.x), (p0.y + factor_max * p1p0.y));
cairo_line_to(ctx, ep.x, ep.y);
return;
}
float tangent = radius / tan(acos(cos_phi) / 2);
float factor_p1p0 = tangent / p1p0_length;
Point<float> t_p1p0((p1.x + factor_p1p0 * p1p0.x), (p1.y + factor_p1p0 * p1p0.y));
Point<float> orth_p1p0(p1p0.y, -p1p0.x);
float orth_p1p0_length = sqrt(orth_p1p0.x * orth_p1p0.x + orth_p1p0.y * orth_p1p0.y);
float factor_ra = radius / orth_p1p0_length;
double cos_alpha = (orth_p1p0.x * p1p2.x + orth_p1p0.y * p1p2.y) / (orth_p1p0_length * p1p2_length);
if (cos_alpha < 0.f)
orth_p1p0 = Point<float>(-orth_p1p0.x, -orth_p1p0.y);
Point<float> p((t_p1p0.x + factor_ra * orth_p1p0.x), (t_p1p0.y + factor_ra * orth_p1p0.y));
orth_p1p0 = Point<float>(-orth_p1p0.x, -orth_p1p0.y);
float sa = acos(orth_p1p0.x / orth_p1p0_length);
if (orth_p1p0.y < 0.f)
sa = 2 * M_PI - sa;
bool anticlockwise = false;
float factor_p1p2 = tangent / p1p2_length;
Point<float> t_p1p2((p1.x + factor_p1p2 * p1p2.x), (p1.y + factor_p1p2 * p1p2.y));
Point<float> orth_p1p2((t_p1p2.x - p.x),(t_p1p2.y - p.y));
float orth_p1p2_length = sqrtf(orth_p1p2.x * orth_p1p2.x + orth_p1p2.y * orth_p1p2.y);
float ea = acos(orth_p1p2.x / orth_p1p2_length);
if (orth_p1p2.y < 0) ea = 2 * M_PI - ea;
if ((sa > ea) && ((sa - ea) < M_PI)) anticlockwise = true;
if ((sa < ea) && ((ea - sa) > M_PI)) anticlockwise = true;
cairo_line_to(ctx, t_p1p0.x, t_p1p0.y);
if (anticlockwise && M_PI * 2 != radius) {
cairo_arc_negative(ctx
, p.x
, p.y
, radius
, sa
, ea);
} else {
cairo_arc(ctx
, p.x
, p.y
, radius
, sa
, ea);
}
}
/*
* Adds an ellipse to the path which is centered at (x, y) position with the
* radii radiusX and radiusY starting at startAngle and ending at endAngle
* going in the given direction by anticlockwise (defaulting to clockwise).
*/
NAN_METHOD(Context2d::Ellipse) {
double args[7];
if(!checkArgs(info, args, 7))
return;
double radiusX = args[2];
double radiusY = args[3];
if (radiusX == 0 || radiusY == 0) return;
double x = args[0];
double y = args[1];
double rotation = args[4];
double startAngle = args[5];
double endAngle = args[6];
bool anticlockwise = Nan::To<bool>(info[7]).FromMaybe(false);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
// See https://www.cairographics.org/cookbook/ellipses/
double xRatio = radiusX / radiusY;
cairo_matrix_t save_matrix;
cairo_get_matrix(ctx, &save_matrix);
cairo_translate(ctx, x, y);
cairo_rotate(ctx, rotation);
cairo_scale(ctx, xRatio, 1.0);
cairo_translate(ctx, -x, -y);
if (anticlockwise && M_PI * 2 != args[4]) {
cairo_arc_negative(ctx,
x,
y,
radiusY,
startAngle,
endAngle);
} else {
cairo_arc(ctx,
x,
y,
radiusY,
startAngle,
endAngle);
}
cairo_set_matrix(ctx, &save_matrix);
}
#undef CHECK_RECEIVER
Reference in New Issue View Git Blame Copy Permalink