// 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 "napi.h"
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#include "uv.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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std::string font = "10px sans-serif";
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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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font = other.font;
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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 Napi::ObjectWrap<Context2d> {
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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 Napi::FunctionReference _DOMMatrix;
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static Napi::FunctionReference _parseFont;
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static Napi::FunctionReference constructor;
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static void Initialize(Napi::Env& env, Napi::Object& target);
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static Napi::Value New(const Napi::CallbackInfo& info);
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static Napi::Value SaveExternalModules(const Napi::CallbackInfo& info);
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static Napi::Value DrawImage(const Napi::CallbackInfo& info);
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static Napi::Value PutImageData(const Napi::CallbackInfo& info);
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static Napi::Value Save(const Napi::CallbackInfo& info);
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static Napi::Value Restore(const Napi::CallbackInfo& info);
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static Napi::Value Rotate(const Napi::CallbackInfo& info);
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static Napi::Value Translate(const Napi::CallbackInfo& info);
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static Napi::Value Scale(const Napi::CallbackInfo& info);
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static Napi::Value Transform(const Napi::CallbackInfo& info);
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static Napi::Value GetTransform(const Napi::CallbackInfo& info);
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static Napi::Value ResetTransform(const Napi::CallbackInfo& info);
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static Napi::Value SetTransform(const Napi::CallbackInfo& info);
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static Napi::Value IsPointInPath(const Napi::CallbackInfo& info);
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static Napi::Value BeginPath(const Napi::CallbackInfo& info);
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static Napi::Value ClosePath(const Napi::CallbackInfo& info);
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static Napi::Value AddPage(const Napi::CallbackInfo& info);
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static Napi::Value Clip(const Napi::CallbackInfo& info);
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static Napi::Value Fill(const Napi::CallbackInfo& info);
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static Napi::Value Stroke(const Napi::CallbackInfo& info);
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static Napi::Value FillText(const Napi::CallbackInfo& info);
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static Napi::Value StrokeText(const Napi::CallbackInfo& info);
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static Napi::Value SetFont(const Napi::CallbackInfo& info);
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static Napi::Value SetFillColor(const Napi::CallbackInfo& info);
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static Napi::Value SetStrokeColor(const Napi::CallbackInfo& info);
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static Napi::Value SetStrokePattern(const Napi::CallbackInfo& info);
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static Napi::Value SetTextAlignment(const Napi::CallbackInfo& info);
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static Napi::Value SetLineDash(const Napi::CallbackInfo& info);
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static Napi::Value GetLineDash(const Napi::CallbackInfo& info);
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static Napi::Value MeasureText(const Napi::CallbackInfo& info);
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static Napi::Value BezierCurveTo(const Napi::CallbackInfo& info);
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static Napi::Value QuadraticCurveTo(const Napi::CallbackInfo& info);
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static Napi::Value LineTo(const Napi::CallbackInfo& info);
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static Napi::Value MoveTo(const Napi::CallbackInfo& info);
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static Napi::Value FillRect(const Napi::CallbackInfo& info);
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static Napi::Value StrokeRect(const Napi::CallbackInfo& info);
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static Napi::Value ClearRect(const Napi::CallbackInfo& info);
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static Napi::Value Rect(const Napi::CallbackInfo& info);
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static Napi::Value RoundRect(const Napi::CallbackInfo& info);
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static Napi::Value Arc(const Napi::CallbackInfo& info);
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static Napi::Value ArcTo(const Napi::CallbackInfo& info);
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static Napi::Value Ellipse(const Napi::CallbackInfo& info);
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static Napi::Value GetImageData(const Napi::CallbackInfo& info);
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static Napi::Value CreateImageData(const Napi::CallbackInfo& info);
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static Napi::Value GetStrokeColor(const Napi::CallbackInfo& info);
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static Napi::Value CreatePattern(const Napi::CallbackInfo& info);
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static Napi::Value CreateLinearGradient(const Napi::CallbackInfo& info);
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static Napi::Value CreateRadialGradient(const Napi::CallbackInfo& info);
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Napi::Value GetFormat(const Napi::CallbackInfo& info);
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Napi::Value GetPatternQuality(const Napi::CallbackInfo& info);
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Napi::Value GetImageSmoothingEnabled(const Napi::CallbackInfo& info);
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Napi::Value GetGlobalCompositeOperation(const Napi::CallbackInfo& info);
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Napi::Value GetGlobalAlpha(const Napi::CallbackInfo& info);
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Napi::Value GetShadowColor(const Napi::CallbackInfo& info);
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Napi::Value GetMiterLimit(const Napi::CallbackInfo& info);
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Napi::Value GetLineCap(const Napi::CallbackInfo& info);
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Napi::Value GetLineJoin(const Napi::CallbackInfo& info);
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Napi::Value GetLineWidth(const Napi::CallbackInfo& info);
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Napi::Value GetLineDashOffset(const Napi::CallbackInfo& info);
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Napi::Value GetShadowOffsetX(const Napi::CallbackInfo& info);
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Napi::Value GetShadowOffsetY(const Napi::CallbackInfo& info);
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Napi::Value GetShadowBlur(const Napi::CallbackInfo& info);
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Napi::Value GetAntiAlias(const Napi::CallbackInfo& info);
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Napi::Value GetTextDrawingMode(const Napi::CallbackInfo& info);
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Napi::Value GetQuality(const Napi::CallbackInfo& info);
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Napi::Value GetCurrentTransform(const Napi::CallbackInfo& info);
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Napi::Value GetFillStyle(const Napi::CallbackInfo& info);
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Napi::Value GetStrokeStyle(const Napi::CallbackInfo& info);
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Napi::Value GetFont(const Napi::CallbackInfo& info);
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Napi::Value GetTextBaseline(const Napi::CallbackInfo& info);
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Napi::Value GetTextAlign(const Napi::CallbackInfo& info);
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void SetPatternQuality(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetImageSmoothingEnabled(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetGlobalCompositeOperation(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetGlobalAlpha(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetShadowColor(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetMiterLimit(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetLineCap(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetLineJoin(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetLineWidth(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetLineDashOffset(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetShadowOffsetX(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetShadowOffsetY(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetShadowBlur(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetAntiAlias(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetTextDrawingMode(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetQuality(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetCurrentTransform(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetFillStyle(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetStrokeStyle(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetFont(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetTextBaseline(const Napi::CallbackInfo& info, const Napi::Value& value);
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void SetTextAlign(const Napi::CallbackInfo& info, const Napi::Value& value);
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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(Napi::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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Napi::Value _getFillColor();
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Napi::Value _getStrokeColor();
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void _setFillColor(Napi::Value arg);
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void _setFillPattern(Napi::Value arg);
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void _setStrokeColor(Napi::Value arg);
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void _setStrokePattern(Napi::Value arg);
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Napi::Persistent<v8::Value> _fillStyle;
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Napi::Persistent<v8::Value> _strokeStyle;
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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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