diff options
Diffstat (limited to 'source/blender/blenlib/intern/math_color.c')
| -rw-r--r-- | source/blender/blenlib/intern/math_color.c | 77 |
1 files changed, 52 insertions, 25 deletions
diff --git a/source/blender/blenlib/intern/math_color.c b/source/blender/blenlib/intern/math_color.c index fc6e722afeb..6637d74dbb1 100644 --- a/source/blender/blenlib/intern/math_color.c +++ b/source/blender/blenlib/intern/math_color.c @@ -25,10 +25,6 @@ * ***** END GPL LICENSE BLOCK ***** * */ -#include <float.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> #include "BLI_math.h" @@ -113,7 +109,9 @@ void yuv_to_rgb(float y, float u, float v, float *lr, float *lg, float *lb) *lb=b; } -void rgb_to_ycc(float r, float g, float b, float *ly, float *lcb, float *lcr) +/* The RGB inputs are supposed gamma corrected and in the range 0 - 1.0f */ +/* Output YCC have a range of 16-235 and 16-240 except with JFIF_0_255 where the range is 0-255 */ +void rgb_to_ycc(float r, float g, float b, float *ly, float *lcb, float *lcr, int colorspace) { float sr,sg, sb; float y, cr, cb; @@ -122,24 +120,53 @@ void rgb_to_ycc(float r, float g, float b, float *ly, float *lcb, float *lcr) sg=255.0f*g; sb=255.0f*b; - - y=(0.257f*sr)+(0.504f*sg)+(0.098f*sb)+16.0f; - cb=(-0.148f*sr)-(0.291f*sg)+(0.439f*sb)+128.0f; - cr=(0.439f*sr)-(0.368f*sg)-(0.071f*sb)+128.0f; + switch (colorspace) { + case BLI_YCC_ITU_BT601 : + y=(0.257f*sr)+(0.504f*sg)+(0.098f*sb)+16.0f; + cb=(-0.148f*sr)-(0.291f*sg)+(0.439f*sb)+128.0f; + cr=(0.439f*sr)-(0.368f*sg)-(0.071f*sb)+128.0f; + break; + case BLI_YCC_ITU_BT709 : + y=(0.183f*sr)+(0.614f*sg)+(0.062f*sb)+16.0f; + cb=(-0.101f*sr)-(0.338f*sg)+(0.439f*sb)+128.0f; + cr=(0.439f*sr)-(0.399f*sg)-(0.040f*sb)+128.0f; + break; + case BLI_YCC_JFIF_0_255 : + y=(0.299f*sr)+(0.587f*sg)+(0.114f*sb); + cb=(-0.16874f*sr)-(0.33126f*sg)+(0.5f*sb)+128.0f; + cr=(0.5f*sr)-(0.41869f*sg)-(0.08131f*sb)+128.0f; + break; + } *ly=y; *lcb=cb; *lcr=cr; } -void ycc_to_rgb(float y, float cb, float cr, float *lr, float *lg, float *lb) + +/* YCC input have a range of 16-235 and 16-240 exepect with JFIF_0_255 where the range is 0-255 */ +/* RGB outputs are in the range 0 - 1.0f */ +void ycc_to_rgb(float y, float cb, float cr, float *lr, float *lg, float *lb, int colorspace) { float r,g,b; - r=1.164f*(y-16.0f)+1.596f*(cr-128.0f); - g=1.164f*(y-16.0f)-0.813f*(cr-128.0f)-0.392f*(cb-128.0f); - b=1.164f*(y-16.0f)+2.017f*(cb-128.0f); - + switch (colorspace) { + case BLI_YCC_ITU_BT601 : + r=1.164f*(y-16.0f)+1.596f*(cr-128.0f); + g=1.164f*(y-16.0f)-0.813f*(cr-128.0f)-0.392f*(cb-128.0f); + b=1.164f*(y-16.0f)+2.017f*(cb-128.0f); + break; + case BLI_YCC_ITU_BT709 : + r=1.164f*(y-16.0f)+1.793f*(cr-128.0f); + g=1.164f*(y-16.0f)-0.534f*(cr-128.0f)-0.213f*(cb-128.0f); + b=1.164f*(y-16.0f)+2.115f*(cb-128.0f); + break; + case BLI_YCC_JFIF_0_255 : + r=y+1.402f*cr - 179.456f; + g=y-0.34414f*cb - 0.71414f*cr + 135.45984f; + b=y+1.772f*cb - 226.816f; + break; + } *lr=r/255.0f; *lg=g/255.0f; *lb=b/255.0f; @@ -369,21 +396,21 @@ int constrain_rgb(float *r, float *g, float *b) { float w; - /* Amount of white needed is w = - min(0, *r, *g, *b) */ + /* Amount of white needed is w = - min(0, *r, *g, *b) */ - w = (0 < *r) ? 0 : *r; - w = (w < *g) ? w : *g; - w = (w < *b) ? w : *b; - w = -w; + w = (0 < *r) ? 0 : *r; + w = (w < *g) ? w : *g; + w = (w < *b) ? w : *b; + w = -w; - /* Add just enough white to make r, g, b all positive. */ + /* Add just enough white to make r, g, b all positive. */ - if (w > 0) { - *r += w; *g += w; *b += w; - return 1; /* Color modified to fit RGB gamut */ - } + if (w > 0) { + *r += w; *g += w; *b += w; + return 1; /* Color modified to fit RGB gamut */ + } - return 0; /* Color within RGB gamut */ + return 0; /* Color within RGB gamut */ } float rgb_to_grayscale(float rgb[3]) |