Canvas.h
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
#include "backend/Backend.h"
#include <cairo.h>
#include "dll_visibility.h"
#include <nan.h>
#include <pango/pangocairo.h>
#include <v8.h>
#include <vector>
/*
* Maxmimum states per context.
* TODO: remove/resize
*/
#ifndef CANVAS_MAX_STATES
#define CANVAS_MAX_STATES 64
#endif
/*
* FontFace describes a font file in terms of one PangoFontDescription that
* will resolve to it and one that the user describes it as (like @font-face)
*/
class FontFace {
public:
PangoFontDescription *sys_desc = nullptr;
PangoFontDescription *user_desc = nullptr;
};
/*
* Canvas.
*/
class Canvas: public Nan::ObjectWrap {
public:
static Nan::Persistent<v8::FunctionTemplate> constructor;
static void Initialize(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target);
static NAN_METHOD(New);
static NAN_METHOD(ToBuffer);
static NAN_GETTER(GetType);
static NAN_GETTER(GetStride);
static NAN_GETTER(GetWidth);
static NAN_GETTER(GetHeight);
static NAN_SETTER(SetWidth);
static NAN_SETTER(SetHeight);
static NAN_METHOD(StreamPNGSync);
static NAN_METHOD(StreamPDFSync);
static NAN_METHOD(StreamJPEGSync);
static NAN_METHOD(RegisterFont);
static v8::Local<v8::Value> Error(cairo_status_t status);
static void ToPngBufferAsync(uv_work_t *req);
static void ToJpegBufferAsync(uv_work_t *req);
static void ToBufferAsyncAfter(uv_work_t *req);
static PangoWeight GetWeightFromCSSString(const char *weight);
static PangoStyle GetStyleFromCSSString(const char *style);
static PangoFontDescription *ResolveFontDescription(const PangoFontDescription *desc);
DLL_PUBLIC inline Backend* backend() { return _backend; }
DLL_PUBLIC inline cairo_surface_t* surface(){ return backend()->getSurface(); }
cairo_t* createCairoContext();
DLL_PUBLIC inline uint8_t *data(){ return cairo_image_surface_get_data(surface()); }
DLL_PUBLIC inline int stride(){ return cairo_image_surface_get_stride(surface()); }
DLL_PUBLIC inline int nBytes(){ return getHeight() * stride(); }
DLL_PUBLIC inline int getWidth() { return backend()->getWidth(); }
DLL_PUBLIC inline int getHeight() { return backend()->getHeight(); }
Canvas(Backend* backend);
void resurface(v8::Local<v8::Object> canvas);
private:
~Canvas();
Backend* _backend;
};