Add dithering algorithms

2026-04-06 13:00:27 +02:00
parent f45b780900
commit eb95cacad4
10 changed files with 335 additions and 59 deletions
@@ -11,11 +11,44 @@ struct ImageDimensions {
  int16_t height;
 };

+enum class ImageDitherMode : uint8_t {
+  Bayer = 0,
+  Atkinson = 1,
+  DiffusedBayer = 2,
+  COUNT,
+};
+
+inline ImageDitherMode imageDitherModeFromSetting(uint8_t value) {
+  switch (static_cast<ImageDitherMode>(value)) {
+    case ImageDitherMode::Bayer:
+    case ImageDitherMode::Atkinson:
+    case ImageDitherMode::DiffusedBayer:
+      return static_cast<ImageDitherMode>(value);
+    case ImageDitherMode::COUNT:
+    default:
+      return ImageDitherMode::Bayer;
+  }
+}
+
+inline const char* getImageDitherCacheSuffix(ImageDitherMode mode) {
+  switch (mode) {
+    case ImageDitherMode::Atkinson:
+      return ".atkinson";
+    case ImageDitherMode::DiffusedBayer:
+      return ".diffused-bayer";
+    case ImageDitherMode::Bayer:
+    case ImageDitherMode::COUNT:
+    default:
+      return ".bayer";
+  }
+}
+
 struct RenderConfig {
  int x, y;
  int maxWidth, maxHeight;
  bool useGrayscale = true;
  bool useDithering = true;
+  ImageDitherMode ditherMode = ImageDitherMode::Bayer;
  bool performanceMode = false;
  bool useExactDimensions = false;  // If true, use maxWidth/maxHeight as exact output size (no recalculation)
  std::string cachePath;            // If non-empty, decoder will write pixel cache to this path