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theoraplay: Removed some unnecessary variables in yuv->rgb conversion.

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Ryan C. Gordon 2023-04-10 16:28:21 -04:00
parent 5f20ea8fb4
commit 8591805c4d
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GPG key ID: FA148B892AB48044
1 changed files with 8 additions and 10 deletions
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18
thirdparty/theoraplay/theoraplay_cvtrgb.h vendored
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@ -21,10 +21,8 @@ static unsigned char *THEORAPLAY_CVT_FNNAME_420(const THEORAPLAY_Allocator *allo
// chapter 4.2 (Y'CbCr -> Y'PbPr -> R'G'B')
// These constants apparently work for NTSC _and_ PAL/SECAM.
const int yexcursion = 219;
const int cbexcursion = 224; // !!! FIXME: this is the same as the cr version, should we mush this into one crcbexcursion var?
const int crexcursion = 224;
const int cboffset = 128; // !!! FIXME: this is the same as the cr version, should we mush this into one crcboffset var?
const int croffset = 128;
const int cbcrexcursion = 224;
const int cbcroffset = 128;
const float kr = 0.299f;
const float kb = 0.114f;
@ -43,10 +41,10 @@ static unsigned char *THEORAPLAY_CVT_FNNAME_420(const THEORAPLAY_Allocator *allo
const int FIXED_POINT_BITS = 7;
const int yoffset = 16;
const int yfactor = (int) ((255.0f / yexcursion) * (1<<FIXED_POINT_BITS));
const int krfactor = (int) ((255.0f * (2.0f * (1.0f - kr)) / crexcursion) * (1<<FIXED_POINT_BITS));
const int kbfactor = (int) ((255.0f * (2.0f * (1.0f - kb)) / cbexcursion) * (1<<FIXED_POINT_BITS));
const int green_krfactor = (int) ((kr / ((1.0f - kb) - kr) * 255.0f * (2.0f * (1.0f - kr)) / crexcursion) * (1<<FIXED_POINT_BITS));
const int green_kbfactor = (int) ((kb / ((1.0f - kb) - kr) * 255.0f * (2.0f * (1.0f - kb)) / cbexcursion) * (1<<FIXED_POINT_BITS));
const int krfactor = (int) ((255.0f * (2.0f * (1.0f - kr)) / cbcrexcursion) * (1<<FIXED_POINT_BITS));
const int kbfactor = (int) ((255.0f * (2.0f * (1.0f - kb)) / cbcrexcursion) * (1<<FIXED_POINT_BITS));
const int green_krfactor = (int) ((kr / ((1.0f - kb) - kr) * 255.0f * (2.0f * (1.0f - kr)) / cbcrexcursion) * (1<<FIXED_POINT_BITS));
const int green_kbfactor = (int) ((kb / ((1.0f - kb) - kr) * 255.0f * (2.0f * (1.0f - kb)) / cbcrexcursion) * (1<<FIXED_POINT_BITS));
int posy;
for (posy = 0; posy < h; posy++)
@ -58,8 +56,8 @@ static unsigned char *THEORAPLAY_CVT_FNNAME_420(const THEORAPLAY_Allocator *allo
{
const int y1 = ((py[posx] - yoffset) * yfactor) >> FIXED_POINT_BITS;
const int y2 = ((py[posx+1] - yoffset) * yfactor) >> FIXED_POINT_BITS;
const int pb = pcb[poshalfx] - cboffset;
const int pr = pcr[poshalfx] - croffset;
const int pb = pcb[poshalfx] - cbcroffset;
const int pr = pcr[poshalfx] - cbcroffset;
const int r1 = y1 + ((pr * krfactor) >> FIXED_POINT_BITS);
const int g1 = y1 - (((green_krfactor * pr) + (green_kbfactor * pb)) >> FIXED_POINT_BITS);
const int b1 = y1 + ((pb * kbfactor) >> FIXED_POINT_BITS);