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ADDED: ImageExtractPalette()

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Ray 2018-10-08 18:57:33 +02:00
parent 4f5937e89b
commit 2320c2febf
2 changed files with 52 additions and 0 deletions
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1
src/raylib.h
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@ -1024,6 +1024,7 @@ RLAPI void ImageResizeNN(Image *image, int newWidth,int newHeight);
RLAPI void ImageResizeCanvas(Image *image, int newWidth, int newHeight, int offsetX, int offsetY, Color color); // Resize canvas and fill with color
RLAPI void ImageMipmaps(Image *image); // Generate all mipmap levels for a provided image
RLAPI void ImageDither(Image *image, int rBpp, int gBpp, int bBpp, int aBpp); // Dither image data to 16bpp or lower (Floyd-Steinberg dithering)
RLAPI Color *ImageExtractPalette(Image image, int maxPaletteSize, int *extractCount); // Extract color palette from image to maximum size (memory should be freed)
RLAPI Image ImageText(const char *text, int fontSize, Color color); // Create an image from text (default font)
RLAPI Image ImageTextEx(Font font, const char *text, float fontSize, float spacing, Color tint); // Create an image from text (custom sprite font)
RLAPI void ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dstRec); // Draw a source image within a destination image

51
src/textures.c
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@ -1445,6 +1445,57 @@ void ImageDither(Image *image, int rBpp, int gBpp, int bBpp, int aBpp)
}
}
// Extract color palette from image to maximum size
// NOTE: Memory allocated should be freed manually!
Color *ImageExtractPalette(Image image, int maxPaletteSize, int *extractCount)
{
#define COLOR_EQUAL(col1, col2) ((col1.r == col2.r)&&(col1.g == col2.g)&&(col1.b == col2.b)&&(col1.a == col2.a))
Color *pixels = GetImageData(image);
Color *palette = (Color *)malloc(maxPaletteSize*sizeof(Color));
int palCount = 0;
for (int i = 0; i < maxPaletteSize; i++) palette[i] = BLANK; // Set all colors to BLANK
for (int i = 0; i < image.width*image.height; i++)
{
if (pixels[i].a > 0)
{
bool colorInPalette = false;
// Check if the color is already on palette
for (int j = 0; j < maxPaletteSize; j++)
{
if (COLOR_EQUAL(pixels[i], palette[j]))
{
colorInPalette = true;
break;
}
}
// Store color if not on the palette
if (!colorInPalette)
{
palette[palCount] = pixels[i]; // Add pixels[i] to palette
palCount++;
// We reached the limit of colors supported by palette
if (palCount >= maxPaletteSize)
{
i = image.width*image.height; // Finish palette get
printf("WARNING: Image palette is greater than %i colors!\n", maxPaletteSize);
}
}
}
}
free(pixels);
*extractCount = palCount;
return palette;
}
// Draw an image (source) within an image (destination)
// TODO: Feel this function could be simplified...
void ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dstRec)