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refactor bitmap

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scawful
2024-08-04 21:03:57 -04:00
parent b1119a0c35
commit 988f89a9cc
2 changed files with 76 additions and 67 deletions
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67
src/app/gfx/bitmap.cc
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@@ -422,6 +422,73 @@ void Bitmap::ApplyPalette(const std::vector<SDL_Color> &palette) {
SDL_LockSurface(surface_.get());
}
void Bitmap::Get8x8Tile(int tile_index, int x, int y,
std::vector<uint8_t> &tile_data,
int &tile_data_offset) {
int tile_offset = tile_index * (width_ * height_);
int tile_x = (x * 8) % width_;
int tile_y = (y * 8) % height_;
for (int i = 0; i < 8; i++) {
int row_offset = tile_offset + ((tile_y + i) * width_);
for (int j = 0; j < 8; j++) {
int pixel_offset = row_offset + (tile_x + j);
int pixel_value = data_[pixel_offset];
tile_data[tile_data_offset] = pixel_value;
tile_data_offset++;
}
}
}
void Bitmap::Get16x16Tile(int tile_index, int x, int y,
std::vector<uint8_t> &tile_data,
int &tile_data_offset) {
int tile_offset = tile_index * (width_ * height_);
for (int i = 0; i < 16; i++) {
int row_offset = tile_offset + ((i / 8) * (width_ * 8));
for (int j = 0; j < 16; j++) {
int pixel_offset =
row_offset + ((j / 8) * 8) + ((i % 8) * width_) + (j % 8);
int pixel_value = data_[pixel_offset];
tile_data[tile_data_offset] = pixel_value;
tile_data_offset++;
}
}
}
void Bitmap::Get16x16Tile(int tile_x, int tile_y,
std::vector<uint8_t> &tile_data,
int &tile_data_offset) {
for (int ty = 0; ty < 16; ty++) {
for (int tx = 0; tx < 16; tx++) {
// Calculate the pixel position in the bitmap
int pixel_x = tile_x + tx;
int pixel_y = tile_y + ty;
int pixel_offset = pixel_y * width_ + pixel_x;
int pixel_value = data_[pixel_offset];
// Store the pixel value in the tile data
tile_data[tile_data_offset++] = pixel_value;
}
}
}
void Bitmap::WriteColor(int position, const ImVec4 &color) {
// Convert ImVec4 (RGBA) to SDL_Color (RGBA)
SDL_Color sdl_color;
sdl_color.r = static_cast<Uint8>(color.x * 255);
sdl_color.g = static_cast<Uint8>(color.y * 255);
sdl_color.b = static_cast<Uint8>(color.z * 255);
sdl_color.a = static_cast<Uint8>(color.w * 255);
// Map SDL_Color to the nearest color index in the surface's palette
Uint8 index =
SDL_MapRGB(surface_->format, sdl_color.r, sdl_color.g, sdl_color.b);
// Write the color index to the pixel data
pixel_data_[position] = index;
modified_ = true;
}
} // namespace gfx
} // namespace app
} // namespace yaze