bitmap.h

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#ifndef YAZE_APP_GFX_BITMAP_H
#define YAZE_APP_GFX_BITMAP_H
 
#include <SDL.h>
 
#include <cstdint>
#include <span>
#include <unordered_map>
#include <vector>
 
#include "app/gfx/backend/irenderer.h"
#include "app/gfx/snes_palette.h"
 
namespace yaze {
 
namespace gfx {
 
// Pixel format constants
constexpr Uint32 SNES_PIXELFORMAT_INDEXED =
    SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX8, 0, 0, 8, 1);
 
constexpr Uint32 SNES_PIXELFORMAT_4BPP = SDL_DEFINE_PIXELFORMAT(
    /*type=*/SDL_PIXELTYPE_INDEX8, /*order=*/0,
    /*layouts=*/0, /*bits=*/4, /*bytes=*/1);
 
constexpr Uint32 SNES_PIXELFORMAT_8BPP = SDL_DEFINE_PIXELFORMAT(
    /*type=*/SDL_PIXELTYPE_INDEX8, /*order=*/0,
    /*layouts=*/0, /*bits=*/8, /*bytes=*/1);
 
enum BitmapFormat {
  kIndexed = 0,
  k4bpp = 1,
  k8bpp = 2,
};
 
 
class Bitmap {
 public:
  Bitmap() = default;
 
  Bitmap(int width, int height, int depth, const std::vector<uint8_t> &data);
 
  Bitmap(int width, int height, int depth, const std::vector<uint8_t> &data,
         const SnesPalette &palette);
 
  Bitmap(const Bitmap& other);
 
  Bitmap& operator=(const Bitmap& other);
 
  Bitmap(Bitmap&& other) noexcept;
 
  Bitmap& operator=(Bitmap&& other) noexcept;
 
  ~Bitmap() = default;
 
  void Create(int width, int height, int depth, std::span<uint8_t> data);
 
  void Create(int width, int height, int depth,
              const std::vector<uint8_t> &data);
 
  void Create(int width, int height, int depth, int format,
              const std::vector<uint8_t> &data);
 
  void Reformat(int format);
 
  void CreateTexture();
 
  void UpdateTexture();
 
  void QueueTextureUpdate(IRenderer *renderer);
 
  void UpdateTextureData();
 
  void SetPalette(const SnesPalette &palette);
 
  void SetPaletteWithTransparent(const SnesPalette &palette, size_t index,
                                 int length = 7);
 
  void ApplyStoredPalette();
 
  void SetPalette(const std::vector<SDL_Color> &palette);
 
  void WriteToPixel(int position, uint8_t value);
 
  void WriteColor(int position, const ImVec4 &color);
 
  void SetPixel(int x, int y, const SnesColor& color);
 
  void Resize(int new_width, int new_height);
 
  void InvalidatePaletteCache();
 
  uint8_t FindColorIndex(const SnesColor& color);
 
  bool ValidateDataSurfaceSync();
 
  void Get8x8Tile(int tile_index, int x, int y, std::vector<uint8_t> &tile_data,
                  int &tile_data_offset);
 
  void Get16x16Tile(int tile_x, int tile_y, std::vector<uint8_t> &tile_data,
                    int &tile_data_offset);
 
  const SnesPalette &palette() const { return palette_; }
  SnesPalette *mutable_palette() { return &palette_; }
  int width() const { return width_; }
  int height() const { return height_; }
  int depth() const { return depth_; }
  auto size() const { return data_.size(); }
  const uint8_t *data() const { return data_.data(); }
  std::vector<uint8_t> &mutable_data() { return data_; }
  SDL_Surface *surface() const { return surface_; }
  TextureHandle texture() const { return texture_; }
  const std::vector<uint8_t> &vector() const { return data_; }
  uint8_t at(int i) const { return data_[i]; }
  bool modified() const { return modified_; }
  bool is_active() const { return active_; }
  void set_active(bool active) { active_ = active; }
  void set_data(const std::vector<uint8_t> &data);
  void set_modified(bool modified) { modified_ = modified; }
  void set_texture(TextureHandle texture) { texture_ = texture; }
 
 
 private:
  int width_ = 0;
  int height_ = 0;
  int depth_ = 0;
 
  bool active_ = false;
  bool modified_ = false;
 
  // Pointer to the texture pixels
  void *texture_pixels = nullptr;
 
  // Pointer to the pixel data
  uint8_t *pixel_data_ = nullptr;
 
  // Palette for the bitmap
  gfx::SnesPalette palette_;
 
  // Data for the bitmap
  std::vector<uint8_t> data_;
 
  // Surface for the bitmap (managed by Arena)
  SDL_Surface *surface_ = nullptr;
 
  // Texture for the bitmap (managed by Arena)
  TextureHandle texture_ = nullptr;
 
  // Optimized palette lookup cache for O(1) color index lookups
  std::unordered_map<uint32_t, uint8_t> color_to_index_cache_;
 
  // Dirty region tracking for efficient texture updates
  struct DirtyRegion {
    int min_x = 0, min_y = 0, max_x = 0, max_y = 0;
    bool is_dirty = false;
    
    void Reset() {
      min_x = min_y = max_x = max_y = 0;
      is_dirty = false;
    }
    
    void AddPoint(int x, int y) {
      if (!is_dirty) {
        min_x = max_x = x;
        min_y = max_y = y;
        is_dirty = true;
      } else {
        min_x = std::min(min_x, x);
        min_y = std::min(min_y, y);
        max_x = std::max(max_x, x);
        max_y = std::max(max_y, y);
      }
    }
  } dirty_region_;
 
  static uint32_t HashColor(const ImVec4& color);
};
 
// Type alias for a table of bitmaps
using BitmapTable = std::unordered_map<int, gfx::Bitmap>;
 
Uint32 GetSnesPixelFormat(int format);
 
}  // namespace gfx
}  // namespace yaze
 
#endif  // YAZE_APP_GFX_BITMAP_H