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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| /** | ||
| Balance filter an image v1.1 | ||
| By zvezdochiot <[email protected]> | ||
| This is free and unencumbered software released into the public domain. | ||
| QUICK START | ||
| #include ... | ||
| #include ... | ||
| #define FILTER_BALANCE_IMPLEMENTATION | ||
| #include "filter_balance.h" | ||
| ... | ||
| unsigned int width = 0, height = 0; | ||
| unsigned int widthb1 = 0, heightb1 = 0; | ||
| unsigned int widthb2 = 0, heightb2 = 0; | ||
| unsigned char components = 1; | ||
| unsigned char componentsb1 = 1, componentsb2 = 1; | ||
| float mix = 1.0f; | ||
| unsigned char* image = stbi_load("foo.png", &width, &height, &components, 0); | ||
| unsigned char* blur1r = stbi_load("foo_blur1r.png", &widthb1, &heightb1, &componentsb1, 0); | ||
| unsigned char* blur2r = stbi_load("foo_blur2r.png", &widthb2, &heightb2, &componentsb2, 0); | ||
| if ((width == widthb1) && (height == heightb1) && (components == componentsb1) && (width == widthb2) && (height == heightb2) && (components == componentsb2)) | ||
| { | ||
| image_filter_balance(width, height, components, mix, image, blur1r, blur2r); | ||
| stbi_write_png("foo.thresgrad.png", width, height, components, image, 0); | ||
| } | ||
| VERSION HISTORY | ||
| 1.1 2024-12-25 "head" Header release. | ||
| 1.0 2024-12-16 "init" Initial release. | ||
| **/ | ||
|
|
||
| #ifndef FILTER_BALANCE_H | ||
| #define FILTER_BALANCE_H | ||
| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
|
|
||
| void image_overlay_blur(unsigned int width, unsigned int height, unsigned char components, unsigned char* blur1r, unsigned char* blur2r); | ||
| void image_overlay(unsigned int width, unsigned int height, unsigned char components, unsigned char* image, unsigned char* blur); | ||
| void image_mix(unsigned int width, unsigned int height, unsigned char components, float coef, unsigned char* image1, unsigned char* image2); | ||
| void image_filter_balance(unsigned int width, unsigned int height, unsigned char components, float mix, unsigned char* image, unsigned char* blur1r, unsigned char* blur2r); | ||
|
|
||
| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
| #endif /* FILTER_BALANCE_H */ | ||
|
|
||
| #ifdef FILTER_BALANCE_IMPLEMENTATION | ||
| #include <stdlib.h> | ||
| #include <math.h> | ||
|
|
||
| void image_overlay_blur(unsigned int width, unsigned int height, unsigned char components, unsigned char* blur1r, unsigned char* blur2r) | ||
| { | ||
| size_t image_size = height * width * components; | ||
| if ((blur1r != NULL) && (blur2r != NULL)) | ||
| { | ||
| for (size_t i = 0; i < image_size; i++) | ||
| { | ||
| float b1r = blur1r[i]; | ||
| float b2r = blur2r[i]; | ||
|
|
||
| /* overlay 1 */ | ||
| float base = 255.0f - b1r; | ||
| float overlay = b2r; | ||
| float retval1 = base; | ||
| if (base > 127.5f) | ||
| { | ||
| retval1 = 255.0f - retval1; | ||
| overlay = 255.0f - overlay; | ||
| } | ||
| retval1 *= overlay; | ||
| retval1 += retval1; | ||
| retval1 /= 255.0f; | ||
| if (base > 127.5f) | ||
| { | ||
| retval1 = 255.0f - retval1; | ||
| } | ||
|
|
||
| /* overlay 2 */ | ||
| base = 255.0f - b2r; | ||
| overlay = b1r; | ||
| float retval2 = base; | ||
| if (base > 127.5f) | ||
| { | ||
| retval2 = 255.0f - retval2; | ||
| overlay = 255.0f - overlay; | ||
| } | ||
| retval2 *= overlay; | ||
| retval2 += retval2; | ||
| retval2 /= 255.0f; | ||
| if (base > 127.5f) | ||
| { | ||
| retval2 = 255.0f - retval2; | ||
| } | ||
|
|
||
| blur1r[i] = (retval1 < 0.0f) ? 0 : ((retval1 < 255.0f) ? (uint8_t)(retval1 + 0.5f) : 255); | ||
| blur2r[i] = (retval2 < 0.0f) ? 0 : ((retval2 < 255.0f) ? (uint8_t)(retval2 + 0.5f) : 255); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void image_overlay(unsigned int width, unsigned int height, unsigned char components, unsigned char* image, unsigned char* blur) | ||
| { | ||
| size_t image_size = height * width * components; | ||
| if ((image != NULL) && (blur != NULL)) | ||
| { | ||
| for (size_t i = 0; i < image_size; i++) | ||
| { | ||
| float im = image[i]; | ||
| float bl = blur[i]; | ||
|
|
||
| /* overlay*/ | ||
| float base = im; | ||
| float overlay = bl; | ||
| float retval = base; | ||
| if (base > 127.5f) | ||
| { | ||
| retval = 255.0f - retval; | ||
| overlay = 255.0f - overlay; | ||
| } | ||
| retval *= overlay; | ||
| retval += retval; | ||
| retval /= 255.0f; | ||
| if (base > 127.5f) | ||
| { | ||
| retval = 255.0f - retval; | ||
| } | ||
|
|
||
| blur[i] = (retval < 0.0f) ? 0 : ((retval < 255.0f) ? (uint8_t)(retval + 0.5f) : 255); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void image_mix(unsigned int width, unsigned int height, unsigned char components, float coef, unsigned char* image1, unsigned char* image2) | ||
| { | ||
| size_t image_size = height * width * components; | ||
| if ((image1 != NULL) && (image2 != NULL)) | ||
| { | ||
| for (size_t i = 0; i < image_size; i++) | ||
| { | ||
| float im1 = image1[i]; | ||
| float im2 = image2[i]; | ||
|
|
||
| /* overlay*/ | ||
| float retval = coef * im1 + (1.0 - coef) * im2; | ||
|
|
||
| image2[i] = (retval < 0.0f) ? 0 : ((retval < 255.0f) ? (uint8_t)(retval + 0.5f) : 255); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void image_filter_balance(unsigned int width, unsigned int height, unsigned char components, float mix, unsigned char* image, unsigned char* blur1r, unsigned char* blur2r) | ||
| { | ||
| image_overlay_blur(width, height, components, blur1r, blur2r); | ||
| image_overlay(width, height, components, image, blur1r); | ||
| image_overlay(width, height, components, blur1r, blur2r); | ||
| image_mix(width, height, components, mix, blur2r, image); | ||
| } | ||
|
|
||
| #endif /* FILTER_BALANCE_IMPLEMENTATION */ |