68 lines
1.4 KiB
Plaintext
68 lines
1.4 KiB
Plaintext
#pragma once
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#include <cairo.h>
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#include "../dll_visibility.h"
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#include <exception>
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#include <napi.h>
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#include <string>
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class Canvas;
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class Backend
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{
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private:
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const std::string name;
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const char* error = NULL;
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protected:
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int width;
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int height;
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cairo_surface_t* surface = nullptr;
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Canvas* canvas = nullptr;
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Backend(std::string name, Napi::CallbackInfo& info);
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public:
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Napi::Env env;
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virtual ~Backend();
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void setCanvas(Canvas* canvas);
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virtual cairo_surface_t* createSurface() = 0;
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virtual cairo_surface_t* recreateSurface();
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DLL_PUBLIC cairo_surface_t* getSurface();
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virtual void destroySurface();
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DLL_PUBLIC std::string getName();
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DLL_PUBLIC int getWidth();
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virtual void setWidth(int width);
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DLL_PUBLIC int getHeight();
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virtual void setHeight(int height);
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// Overridden by ImageBackend. SVG and PDF thus always return INVALID.
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virtual cairo_format_t getFormat() {
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return CAIRO_FORMAT_INVALID;
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}
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bool isSurfaceValid();
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inline const char* getError(){ return error; }
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};
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class BackendOperationNotAvailable: public std::exception
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{
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private:
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std::string operation_name;
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std::string msg;
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public:
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BackendOperationNotAvailable(Backend* backend, std::string operation_name);
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~BackendOperationNotAvailable() throw();
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const char* what() const throw();
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};
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