Adding ability to modify the color palette of BMP images (untested)

src/gdisp/gdisp_image.c

@@ -33,6 +33,9 @@
 	extern gdispImageError gdispImageCache_BMP(gdispImage *img);
 	extern gdispImageError gdispGImageDraw_BMP(GDisplay *g, gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy);
 	extern delaytime_t gdispImageNext_BMP(gdispImage *img);
+	extern int gdispImageGetPaletteSize_BMP(gdispImage *img);
+	extern color_t gdispImageGetPalette_BMP(gdispImage *img, int index);
+	extern bool_t gdispImageAdjustPalette_BMP(gdispImage *img, int index, color_t newColor);
 #endif
 
 #if GDISP_NEED_IMAGE_JPG
@@ -62,32 +65,40 @@ typedef struct gdispImageHandlers {
 							coord_t cx, coord_t cy,
 							coord_t sx, coord_t sy);			/* The draw function */
 	delaytime_t		(*next)(gdispImage *img);					/* The next frame function */
+	int				(*getPaletteSize)(gdispImage *img);			/* Retrieve the size of the palette (number of entries) */
+	color_t			(*getPalette)(gdispImage *img, int index);	/* Retrieve a specific color value of the palette */
+	bool_t			(*adjustPalette)(gdispImage *img, int index, color_t newColor);		/* Replace a color value in the palette */
 } gdispImageHandlers;
 
 static gdispImageHandlers ImageHandlers[] = {
 	#if GDISP_NEED_IMAGE_NATIVE
 		{	gdispImageOpen_NATIVE,	gdispImageClose_NATIVE,
 			gdispImageCache_NATIVE,	gdispGImageDraw_NATIVE,	gdispImageNext_NATIVE,
+			0,						0,						0
 		},
 	#endif
 	#if GDISP_NEED_IMAGE_GIF
 		{	gdispImageOpen_GIF,		gdispImageClose_GIF,
 			gdispImageCache_GIF,	gdispGImageDraw_GIF,	gdispImageNext_GIF,
+			0,						0,						0
 		},
 	#endif
 	#if GDISP_NEED_IMAGE_BMP
 		{	gdispImageOpen_BMP,				gdispImageClose_BMP,
 			gdispImageCache_BMP,			gdispGImageDraw_BMP,		gdispImageNext_BMP,
+			gdispImageGetPaletteSize_BMP,	gdispImageGetPalette_BMP,	gdispImageAdjustPalette_BMP
 		},
 	#endif
 	#if GDISP_NEED_IMAGE_JPG
 		{	gdispImageOpen_JPG,		gdispImageClose_JPG,
 			gdispImageCache_JPG,	gdispGImageDraw_JPG,	gdispImageNext_JPG,
+			0,						0,						0
 		},
 	#endif
 	#if GDISP_NEED_IMAGE_PNG
 		{	gdispImageOpen_PNG,		gdispImageClose_PNG,
 			gdispImageCache_PNG,	gdispGImageDraw_PNG,	gdispImageNext_PNG,
+			0,						0,						0
 		},
 	#endif
 };

src/gdisp/gdisp_image.h

@@ -248,6 +248,10 @@ extern "C" {
 	 */
 	delaytime_t gdispImageNext(gdispImage *img);
 	
+	int gdispImageGetPaletteSize(gdispImage *img);
+	color_t gdispImageGetPalette(gdispImage *img, int index);
+	bool_t gdispImageAdjustPalette(gdispImage *img, int index, color_t newColor);
+	
 #ifdef __cplusplus
 }
 #endif

src/gdisp/gdisp_image_bmp.c

@@ -829,4 +829,73 @@ delaytime_t gdispImageNext_BMP(gdispImage *img) {
 	return TIME_INFINITE;
 }
 
+int gdispImageGetPaletteSize_BMP(gdispImage *img) {
+	#if GDISP_NEED_IMAGE_BMP_1 || GDISP_NEED_IMAGE_BMP_4 || GDISP_NEED_IMAGE_BMP_8
+		gdispImagePrivate_BMP *priv;
+	
+		priv = (gdispImagePrivate_BMP *)img->priv;
+		if (!priv) {
+			return 0;
+		}
+	
+		if (!(priv->bmpflags & BMP_PALETTE)) {
+			return 0;
+		}
+	
+		return priv->palsize;
+	#else
+		return 0;
+	#endif
+}
+
+color_t gdispImageGetPalette_BMP(gdispImage *img, int index) {
+	#if GDISP_NEED_IMAGE_BMP_1 || GDISP_NEED_IMAGE_BMP_4 || GDISP_NEED_IMAGE_BMP_8
+		gdispImagePrivate_BMP *priv;
+	
+		priv = (gdispImagePrivate_BMP *)img->priv;
+		if (!priv) {
+			return 0;
+		}
+	
+		if (!(priv->bmpflags & BMP_PALETTE)) {
+			return 0;
+		}
+	
+		if (index < 0 || index >= priv->palsize) {
+			return 0;
+		}
+	
+		return priv->palette[index];
+	
+	#else
+		return 0;
+	#endif
+}
+
+bool_t gdispImageAdjustPalette_BMP(gdispImage *img, int index, color_t newColor) {
+	#if GDISP_NEED_IMAGE_BMP_1 || GDISP_NEED_IMAGE_BMP_4 || GDISP_NEED_IMAGE_BMP_8
+		gdispImagePrivate_BMP *priv;
+	
+		priv = (gdispImagePrivate_BMP *)img->priv;
+		if (!priv) {
+			return FALSE;
+		}
+	
+		if (!(priv->bmpflags & BMP_PALETTE)) {
+			return FALSE;
+		}
+	
+		if (index < 0 || index >= priv->palsize) {
+			return FALSE;
+		}
+
+		priv->palette[index] = newColor;
+
+		return TRUE;
+	
+	#else
+		return 0;
+	#endif
+}
+
 #endif /* GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_BMP */