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REDESIGNED: ImageAlphaClear(), optimized #1218

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raysan5 2020-06-10 23:10:16 +02:00
parent 4745ebeed5
commit a6e6a99cb6
1 changed files with 81 additions and 11 deletions
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86
src/textures.c
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@ -1122,18 +1122,88 @@ void ImageAlphaClear(Image *image, Color color, float threshold)
// Security check to avoid program crash
if ((image->data == NULL) || (image->width == 0) || (image->height == 0)) return;
Color *pixels = GetImageData(*image);
unsigned char thresholdValue = (unsigned char)(threshold*255.0f);
if (image->mipmaps > 1) TRACELOG(LOG_WARNING, "Image manipulation only applied to base mipmap level");
if (image->format >= COMPRESSED_DXT1_RGB) TRACELOG(LOG_WARNING, "Image manipulation not supported for compressed formats");
else
{
switch (image->format)
{
case UNCOMPRESSED_GRAY_ALPHA:
{
unsigned char thresholdValue = (unsigned char)(threshold*255.0f);
for (int i = 1; i < image->width*image->height*2; i += 2)
{
if (((unsigned char *)image->data)[i] <= thresholdValue)
{
((unsigned char *)image->data)[i - 1] = color.r;
((unsigned char *)image->data)[i] = color.a;
}
}
} break;
case UNCOMPRESSED_R5G5B5A1:
{
unsigned char thresholdValue = ((threshold < 0.5f)? 0 : 1);
for (int i = 0; i < image->width*image->height; i++) if (pixels[i].a <= thresholdValue) pixels[i] = color;
unsigned char r = (unsigned char)(round((float)color.r*31.0f));
unsigned char g = (unsigned char)(round((float)color.g*31.0f));
unsigned char b = (unsigned char)(round((float)color.b*31.0f));
unsigned char a = (color.a < 128)? 0 : 1;
RL_FREE(image->data);
int format = image->format;
for (int i = 0; i < image->width*image->height; i++)
{
if ((((unsigned short *)image->data)[i] & 0b0000000000000001) <= thresholdValue)
{
((unsigned short *)image->data)[i] = (unsigned short)r << 11 | (unsigned short)g << 6 | (unsigned short)b << 1 | (unsigned short)a;
}
}
} break;
case UNCOMPRESSED_R4G4B4A4:
{
unsigned char thresholdValue = (unsigned char)(threshold*15.0f);
image->data = pixels;
image->format = UNCOMPRESSED_R8G8B8A8;
unsigned char r = (unsigned char)(round((float)color.r*15.0f));
unsigned char g = (unsigned char)(round((float)color.g*15.0f));
unsigned char b = (unsigned char)(round((float)color.b*15.0f));
unsigned char a = (unsigned char)(round((float)color.a*15.0f));
ImageFormat(image, format);
for (int i = 0; i < image->width*image->height; i++)
{
if ((((unsigned short *)image->data)[i] & 0x000f) <= thresholdValue)
{
((unsigned short *)image->data)[i] = (unsigned short)r << 12 | (unsigned short)g << 8 | (unsigned short)b << 4 | (unsigned short)a;
}
}
} break;
case UNCOMPRESSED_R8G8B8A8:
{
unsigned char thresholdValue = (unsigned char)(threshold*255.0f);
for (int i = 3; i < image->width*image->height*4; i += 4)
{
if (((unsigned char *)image->data)[i] <= thresholdValue)
{
((unsigned char *)image->data)[i - 3] = color.r;
((unsigned char *)image->data)[i - 2] = color.g;
((unsigned char *)image->data)[i - 1] = color.b;
((unsigned char *)image->data)[i] = color.a;
}
}
} break;
case UNCOMPRESSED_R32G32B32A32:
{
for (int i = 3; i < image->width*image->height*4; i += 4)
{
if (((float *)image->data)[i] <= threshold)
{
((float *)image->data)[i - 3] = (float)color.r/255.0f;
((float *)image->data)[i - 2] = (float)color.g/255.0f;
((float *)image->data)[i - 1] = (float)color.b/255.0f;
((float *)image->data)[i] = (float)color.a/255.0f;
}
}
} break;
default: break;
}
}
}
// Apply alpha mask to image