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Use macro instead of literal constant for readability.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8716 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2006-02-17 17:21:42 +00:00
parent 41f1ab2710
commit e179291190
1 changed files with 16 additions and 14 deletions
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30
apps/plugins/jpeg.c
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@ -1785,6 +1785,8 @@ int root_size;
#define BUFAC 14118 /* 31 * 257 * 1.772 */ #define BUFAC 14118 /* 31 * 257 * 1.772 */
#endif #endif
#define ROUNDOFFS (127*257)
/* Draw a partial YUV colour bitmap */ /* Draw a partial YUV colour bitmap */
void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y, void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
int src_x, int src_y, int stride, int src_x, int src_y, int stride,
@ -1839,9 +1841,9 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
u = *usrc++ - 128; u = *usrc++ - 128;
v = *vsrc++ - 128; v = *vsrc++ - 128;
rc = RVFAC * v + 32639; rc = RVFAC * v + ROUNDOFFS;
gc = GVFAC * v + GUFAC * u + 32639; gc = GVFAC * v + GUFAC * u + ROUNDOFFS;
bc = BUFAC * u + 32639; bc = BUFAC * u + ROUNDOFFS;
do do
{ {
@ -1850,26 +1852,26 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
green = GYFAC * y + gc; green = GYFAC * y + gc;
blue = BYFAC * y + bc; blue = BYFAC * y + bc;
if ((unsigned)red > (RYFAC*255+32639)) if ((unsigned)red > (RYFAC*255+ROUNDOFFS))
{ {
if (red < 0) if (red < 0)
red = 0; red = 0;
else else
red = (RYFAC*255+32639); red = (RYFAC*255+ROUNDOFFS);
} }
if ((unsigned)green > (GYFAC*255+32639)) if ((unsigned)green > (GYFAC*255+ROUNDOFFS))
{ {
if (green < 0) if (green < 0)
green = 0; green = 0;
else else
green = (GYFAC*255+32639); green = (GYFAC*255+ROUNDOFFS);
} }
if ((unsigned)blue > (BYFAC*255+32639)) if ((unsigned)blue > (BYFAC*255+ROUNDOFFS))
{ {
if (blue < 0) if (blue < 0)
blue = 0; blue = 0;
else else
blue = (BYFAC*255+32639); blue = (BYFAC*255+ROUNDOFFS);
} }
rbits = ((unsigned)red) >> 16 ; rbits = ((unsigned)red) >> 16 ;
gbits = ((unsigned)green) >> 16 ; gbits = ((unsigned)green) >> 16 ;
@ -1884,9 +1886,9 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
{ {
u = *usrc++ - 128; u = *usrc++ - 128;
v = *vsrc++ - 128; v = *vsrc++ - 128;
rc = RVFAC * v + 32639; rc = RVFAC * v + ROUNDOFFS;
gc = GVFAC * v + GUFAC * u + 32639; gc = GVFAC * v + GUFAC * u + ROUNDOFFS;
bc = BUFAC * u + 32639; bc = BUFAC * u + ROUNDOFFS;
xphase = 0; xphase = 0;
} }
} }
@ -1897,8 +1899,8 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
do do
{ {
y = *ysrc++; y = *ysrc++;
red = RYFAC * y + 32639; /* blue == red */ red = RYFAC * y + ROUNDOFFS; /* blue == red */
green = GYFAC * y + 32639; green = GYFAC * y + ROUNDOFFS;
rbits = ((unsigned)red) >> 16; rbits = ((unsigned)red) >> 16;
gbits = ((unsigned)green) >> 16; gbits = ((unsigned)green) >> 16;
#if LCD_PIXELFORMAT == RGB565 #if LCD_PIXELFORMAT == RGB565