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Added new function: ImageAlphaCrop()

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Ray
2018-01-11 10:22:32 +01:00
parent c37d2d448d
commit 278d8575bd
2 changed files with 48 additions and 0 deletions
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1
src/raylib.h
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@@ -881,6 +881,7 @@ RLAPI void ImageToPOT(Image *image, Color fillColor);
RLAPI void ImageFormat(Image *image, int newFormat); // Convert image data to desired format RLAPI void ImageFormat(Image *image, int newFormat); // Convert image data to desired format
RLAPI void ImageAlphaMask(Image *image, Image alphaMask); // Apply alpha mask to image RLAPI void ImageAlphaMask(Image *image, Image alphaMask); // Apply alpha mask to image
RLAPI void ImageAlphaClear(Image *image, Color color, float threshold); // Clear alpha channel to desired color RLAPI void ImageAlphaClear(Image *image, Color color, float threshold); // Clear alpha channel to desired color
RLAPI void ImageAlphaCrop(Image *image, float threshold); // Crop image depending on alpha value
RLAPI void ImageAlphaPremultiply(Image *image); // Premultiply alpha channel RLAPI void ImageAlphaPremultiply(Image *image); // Premultiply alpha channel
RLAPI void ImageCrop(Image *image, Rectangle crop); // Crop an image to a defined rectangle RLAPI void ImageCrop(Image *image, Rectangle crop); // Crop an image to a defined rectangle
RLAPI void ImageResize(Image *image, int newWidth, int newHeight); // Resize and image (bilinear filtering) RLAPI void ImageResize(Image *image, int newWidth, int newHeight); // Resize and image (bilinear filtering)

47
src/textures.c
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@@ -890,6 +890,51 @@ void ImageAlphaClear(Image *image, Color color, float threshold)
ImageFormat(image, prevFormat); ImageFormat(image, prevFormat);
} }
// Crop image depending on alpha value
void ImageAlphaCrop(Image *image, float threshold)
{
Rectangle crop = { 0 };
Color *pixels = GetImageData(*image);
int minx = 0;
int miny = 0;
for (int i = 0; i < image->width*image->height; i++)
{
if (pixels[i].a > (unsigned char)(threshold*255.0f))
{
minx = i%image->width;
miny = -(-((i/image->width) + 1) + 1);
if (crop.y == 0) crop.y = miny;
if (crop.x == 0) crop.x = minx;
else if (minx < crop.x) crop.x = minx;
if (crop.width == 0) crop.width = minx;
else if (crop.width < minx) crop.width = minx;
if (crop.height == 0) crop.height = miny;
else if (crop.height < miny) crop.height = miny;
}
}
crop.width -= (crop.x - 1);
crop.height -= (crop.y - 1);
TraceLog(LOG_INFO, "Crop rectangle: (%i, %i, %i, %i)", crop.x, crop.y, crop.width, crop.height);
free(pixels);
// NOTE: Added this weird check to avoid additional 1px crop to
// image data that has already been cropped...
if ((crop.x != 1) &&
(crop.y != 1) &&
(crop.width != image->width - 1) &&
(crop.height != image->height - 1)) ImageCrop(image, crop);
}
// Premultiply alpha channel // Premultiply alpha channel
void ImageAlphaPremultiply(Image *image) void ImageAlphaPremultiply(Image *image)
{ {
@@ -912,6 +957,8 @@ void ImageAlphaPremultiply(Image *image)
ImageFormat(image, prevFormat); ImageFormat(image, prevFormat);
} }
#if defined(SUPPORT_IMAGE_MANIPULATION) #if defined(SUPPORT_IMAGE_MANIPULATION)
// Crop an image to area defined by a rectangle // Crop an image to area defined by a rectangle
// NOTE: Security checks are performed in case rectangle goes out of bounds // NOTE: Security checks are performed in case rectangle goes out of bounds