raster.hpp

[詳解]

#ifndef TYPESET_BACKEND_RASTER_HPP
#define TYPESET_BACKEND_RASTER_HPP
 
#include <cstdint>
#include <memory>
#include <vector>
 
#include "typeset/dl/display_list.hpp"
 
namespace typeset::backend {
 
struct Bitmap {
    int width = 0;
    int height = 0;
    std::vector<uint32_t> argb;
 
    uint32_t* row(int y) { return argb.data() + static_cast<size_t>(y) * width; }
    const uint32_t* row(int y) const { return argb.data() + static_cast<size_t>(y) * width; }
};
 
struct RasterOptions {
    float dpi = 72.0f;
    Color background{255, 255, 255, 255};   
    bool useCache = true;
    bool antialias = true;
    uint8_t alphaThreshold = 128;
};
 
class RasterRenderer {
public:
    RasterRenderer();
    ~RasterRenderer();
 
    RasterRenderer(const RasterRenderer&) = delete;
    RasterRenderer& operator=(const RasterRenderer&) = delete;
 
    Bitmap render(const dl::DisplayList& list, const RasterOptions& opts = {});
 
    void render(const dl::DisplayList& list,
                uint32_t* pixels, int width, int height, int stridePixels,
                const Matrix& toDevice, bool useCache = true, uint8_t alphaThreshold = 0);
 
    void clearCache();
    void setCacheMaxBytes(size_t bytes);
 
private:
    struct Impl;
    std::unique_ptr<Impl> impl_;
};
 
bool savePng(const Bitmap& bitmap, const std::string& path);
 
} // namespace typeset::backend
 
#endif // TYPESET_BACKEND_RASTER_HPP