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https://gitee.com/onvia/ccc-tnt-psd2ui
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225 lines
7.5 KiB
C++
225 lines
7.5 KiB
C++
// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
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#pragma once
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#include "cairo.h"
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#include "Canvas.h"
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#include "color.h"
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#include "nan.h"
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#include <pango/pangocairo.h>
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#include <stack>
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/*
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* State struct.
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*
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* Used in conjunction with Save() / Restore() since
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* cairo's gstate maintains only a single source pattern at a time.
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*/
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struct canvas_state_t {
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rgba_t fill = { 0, 0, 0, 1 };
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rgba_t stroke = { 0, 0, 0, 1 };
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rgba_t shadow = { 0, 0, 0, 0 };
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double shadowOffsetX = 0.;
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double shadowOffsetY = 0.;
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cairo_pattern_t* fillPattern = nullptr;
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cairo_pattern_t* strokePattern = nullptr;
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cairo_pattern_t* fillGradient = nullptr;
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cairo_pattern_t* strokeGradient = nullptr;
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PangoFontDescription* fontDescription = nullptr;
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cairo_filter_t patternQuality = CAIRO_FILTER_GOOD;
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float globalAlpha = 1.f;
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int shadowBlur = 0;
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text_align_t textAlignment = TEXT_ALIGNMENT_LEFT; // TODO default is supposed to be START
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text_baseline_t textBaseline = TEXT_BASELINE_ALPHABETIC;
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canvas_draw_mode_t textDrawingMode = TEXT_DRAW_PATHS;
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bool imageSmoothingEnabled = true;
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canvas_state_t() {
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fontDescription = pango_font_description_from_string("sans");
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pango_font_description_set_absolute_size(fontDescription, 10 * PANGO_SCALE);
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}
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canvas_state_t(const canvas_state_t& other) {
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fill = other.fill;
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stroke = other.stroke;
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patternQuality = other.patternQuality;
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fillPattern = other.fillPattern;
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strokePattern = other.strokePattern;
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fillGradient = other.fillGradient;
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strokeGradient = other.strokeGradient;
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globalAlpha = other.globalAlpha;
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textAlignment = other.textAlignment;
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textBaseline = other.textBaseline;
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shadow = other.shadow;
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shadowBlur = other.shadowBlur;
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shadowOffsetX = other.shadowOffsetX;
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shadowOffsetY = other.shadowOffsetY;
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textDrawingMode = other.textDrawingMode;
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fontDescription = pango_font_description_copy(other.fontDescription);
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imageSmoothingEnabled = other.imageSmoothingEnabled;
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}
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~canvas_state_t() {
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pango_font_description_free(fontDescription);
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}
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};
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/*
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* Equivalent to a PangoRectangle but holds floats instead of ints
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* (software pixels are stored here instead of pango units)
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*
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* Should be compatible with PANGO_ASCENT, PANGO_LBEARING, etc.
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*/
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typedef struct {
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float x;
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float y;
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float width;
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float height;
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} float_rectangle;
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class Context2d : public Nan::ObjectWrap {
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public:
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std::stack<canvas_state_t> states;
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canvas_state_t *state;
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Context2d(Canvas *canvas);
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static Nan::Persistent<v8::Function> _DOMMatrix;
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static Nan::Persistent<v8::Function> _parseFont;
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static Nan::Persistent<v8::FunctionTemplate> constructor;
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static void Initialize(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target);
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static NAN_METHOD(New);
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static NAN_METHOD(SaveExternalModules);
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static NAN_METHOD(DrawImage);
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static NAN_METHOD(PutImageData);
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static NAN_METHOD(Save);
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static NAN_METHOD(Restore);
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static NAN_METHOD(Rotate);
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static NAN_METHOD(Translate);
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static NAN_METHOD(Scale);
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static NAN_METHOD(Transform);
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static NAN_METHOD(GetTransform);
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static NAN_METHOD(ResetTransform);
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static NAN_METHOD(SetTransform);
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static NAN_METHOD(IsPointInPath);
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static NAN_METHOD(BeginPath);
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static NAN_METHOD(ClosePath);
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static NAN_METHOD(AddPage);
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static NAN_METHOD(Clip);
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static NAN_METHOD(Fill);
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static NAN_METHOD(Stroke);
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static NAN_METHOD(FillText);
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static NAN_METHOD(StrokeText);
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static NAN_METHOD(SetFont);
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static NAN_METHOD(SetFillColor);
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static NAN_METHOD(SetStrokeColor);
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static NAN_METHOD(SetStrokePattern);
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static NAN_METHOD(SetTextAlignment);
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static NAN_METHOD(SetLineDash);
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static NAN_METHOD(GetLineDash);
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static NAN_METHOD(MeasureText);
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static NAN_METHOD(BezierCurveTo);
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static NAN_METHOD(QuadraticCurveTo);
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static NAN_METHOD(LineTo);
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static NAN_METHOD(MoveTo);
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static NAN_METHOD(FillRect);
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static NAN_METHOD(StrokeRect);
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static NAN_METHOD(ClearRect);
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static NAN_METHOD(Rect);
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static NAN_METHOD(RoundRect);
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static NAN_METHOD(Arc);
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static NAN_METHOD(ArcTo);
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static NAN_METHOD(Ellipse);
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static NAN_METHOD(GetImageData);
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static NAN_METHOD(CreateImageData);
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static NAN_METHOD(GetStrokeColor);
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static NAN_METHOD(CreatePattern);
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static NAN_METHOD(CreateLinearGradient);
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static NAN_METHOD(CreateRadialGradient);
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static NAN_GETTER(GetFormat);
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static NAN_GETTER(GetPatternQuality);
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static NAN_GETTER(GetImageSmoothingEnabled);
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static NAN_GETTER(GetGlobalCompositeOperation);
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static NAN_GETTER(GetGlobalAlpha);
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static NAN_GETTER(GetShadowColor);
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static NAN_GETTER(GetMiterLimit);
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static NAN_GETTER(GetLineCap);
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static NAN_GETTER(GetLineJoin);
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static NAN_GETTER(GetLineWidth);
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static NAN_GETTER(GetLineDashOffset);
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static NAN_GETTER(GetShadowOffsetX);
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static NAN_GETTER(GetShadowOffsetY);
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static NAN_GETTER(GetShadowBlur);
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static NAN_GETTER(GetAntiAlias);
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static NAN_GETTER(GetTextDrawingMode);
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static NAN_GETTER(GetQuality);
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static NAN_GETTER(GetCurrentTransform);
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static NAN_GETTER(GetFillStyle);
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static NAN_GETTER(GetStrokeStyle);
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static NAN_GETTER(GetFont);
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static NAN_GETTER(GetTextBaseline);
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static NAN_GETTER(GetTextAlign);
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static NAN_SETTER(SetPatternQuality);
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static NAN_SETTER(SetImageSmoothingEnabled);
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static NAN_SETTER(SetGlobalCompositeOperation);
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static NAN_SETTER(SetGlobalAlpha);
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static NAN_SETTER(SetShadowColor);
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static NAN_SETTER(SetMiterLimit);
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static NAN_SETTER(SetLineCap);
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static NAN_SETTER(SetLineJoin);
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static NAN_SETTER(SetLineWidth);
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static NAN_SETTER(SetLineDashOffset);
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static NAN_SETTER(SetShadowOffsetX);
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static NAN_SETTER(SetShadowOffsetY);
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static NAN_SETTER(SetShadowBlur);
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static NAN_SETTER(SetAntiAlias);
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static NAN_SETTER(SetTextDrawingMode);
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static NAN_SETTER(SetQuality);
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static NAN_SETTER(SetCurrentTransform);
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static NAN_SETTER(SetFillStyle);
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static NAN_SETTER(SetStrokeStyle);
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static NAN_SETTER(SetFont);
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static NAN_SETTER(SetTextBaseline);
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static NAN_SETTER(SetTextAlign);
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inline void setContext(cairo_t *ctx) { _context = ctx; }
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inline cairo_t *context(){ return _context; }
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inline Canvas *canvas(){ return _canvas; }
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inline bool hasShadow();
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void inline setSourceRGBA(rgba_t color);
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void inline setSourceRGBA(cairo_t *ctx, rgba_t color);
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void setTextPath(double x, double y);
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void blur(cairo_surface_t *surface, int radius);
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void shadow(void (fn)(cairo_t *cr));
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void shadowStart();
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void shadowApply();
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void savePath();
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void restorePath();
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void saveState();
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void restoreState();
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void inline setFillRule(v8::Local<v8::Value> value);
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void fill(bool preserve = false);
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void stroke(bool preserve = false);
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void save();
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void restore();
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void setFontFromState();
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void resetState();
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inline PangoLayout *layout(){ return _layout; }
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private:
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~Context2d();
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void _resetPersistentHandles();
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v8::Local<v8::Value> _getFillColor();
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v8::Local<v8::Value> _getStrokeColor();
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void _setFillColor(v8::Local<v8::Value> arg);
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void _setFillPattern(v8::Local<v8::Value> arg);
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void _setStrokeColor(v8::Local<v8::Value> arg);
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void _setStrokePattern(v8::Local<v8::Value> arg);
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Nan::Persistent<v8::Value> _fillStyle;
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Nan::Persistent<v8::Value> _strokeStyle;
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Nan::Persistent<v8::Value> _font;
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Canvas *_canvas;
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cairo_t *_context;
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cairo_path_t *_path;
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PangoLayout *_layout;
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};
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