ReceiveTempSMS
/
Sweden-Number
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

gdi32: Use a reduced precision for RGB to palette mapping in DIB conversions.

This commit is contained in:
Alexandre Julliard 2011-10-14 00:47:05 +02:00
parent 8f8e86eaa3
commit a9be526a9c
1 changed files with 38 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
dlls/gdi32/dibdrv/primitives.c
View File

@ -2404,6 +2404,12 @@ static inline BOOL color_tables_match(const dib_info *d1, const dib_info *d2)
return !memcmp(d1->color_table, d2->color_table, d1->color_table_size * sizeof(d1->color_table[0]));
}
static inline DWORD rgb_lookup_colortable(const dib_info *dst, BYTE r, BYTE g, BYTE b)
{
/* Windows reduces precision to 5 bits, probably in order to build some sort of lookup cache */
return rgb_to_pixel_colortable( dst, (r & ~7) + 4, (g & ~7) + 4, (b & ~7) + 4 );
}
static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rect)
{
BYTE *dst_start = get_pixel_ptr_8(dst, 0, 0), *dst_pixel;
@ -2425,7 +2431,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst, src_val >> 16, src_val >> 8, src_val );
*dst_pixel++ = rgb_lookup_colortable(dst, src_val >> 16, src_val >> 8, src_val );
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2441,10 +2447,10 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst,
src_val >> src->red_shift,
src_val >> src->green_shift,
src_val >> src->blue_shift );
*dst_pixel++ = rgb_lookup_colortable(dst,
src_val >> src->red_shift,
src_val >> src->green_shift,
src_val >> src->blue_shift );
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2460,10 +2466,10 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst,
get_field(src_val, src->red_shift, src->red_len),
get_field(src_val, src->green_shift, src->green_len),
get_field(src_val, src->blue_shift, src->blue_len));
*dst_pixel++ = rgb_lookup_colortable(dst,
get_field(src_val, src->red_shift, src->red_len),
get_field(src_val, src->green_shift, src->green_len),
get_field(src_val, src->blue_shift, src->blue_len));
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2483,7 +2489,7 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
src_pixel = src_start;
for(x = src_rect->left; x < src_rect->right; x++, src_pixel += 3)
{
*dst_pixel++ = rgb_to_pixel_colortable(dst, src_pixel[2], src_pixel[1], src_pixel[0] );
*dst_pixel++ = rgb_lookup_colortable(dst, src_pixel[2], src_pixel[1], src_pixel[0] );
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2504,10 +2510,10 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst,
((src_val >> 7) & 0xf8) | ((src_val >> 12) & 0x07),
((src_val >> 2) & 0xf8) | ((src_val >> 7) & 0x07),
((src_val << 3) & 0xf8) | ((src_val >> 2) & 0x07) );
*dst_pixel++ = rgb_lookup_colortable(dst,
((src_val >> 7) & 0xf8) | ((src_val >> 12) & 0x07),
((src_val >> 2) & 0xf8) | ((src_val >> 7) & 0x07),
((src_val << 3) & 0xf8) | ((src_val >> 2) & 0x07) );
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2523,13 +2529,13 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst,
(((src_val >> src->red_shift) << 3) & 0xf8) |
(((src_val >> src->red_shift) >> 2) & 0x07),
(((src_val >> src->green_shift) << 3) & 0xf8) |
(((src_val >> src->green_shift) >> 2) & 0x07),
(((src_val >> src->blue_shift) << 3) & 0xf8) |
(((src_val >> src->blue_shift) >> 2) & 0x07) );
*dst_pixel++ = rgb_lookup_colortable(dst,
(((src_val >> src->red_shift) << 3) & 0xf8) |
(((src_val >> src->red_shift) >> 2) & 0x07),
(((src_val >> src->green_shift) << 3) & 0xf8) |
(((src_val >> src->green_shift) >> 2) & 0x07),
(((src_val >> src->blue_shift) << 3) & 0xf8) |
(((src_val >> src->blue_shift) >> 2) & 0x07) );
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2545,13 +2551,13 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst,
(((src_val >> src->red_shift) << 3) & 0xf8) |
(((src_val >> src->red_shift) >> 2) & 0x07),
(((src_val >> src->green_shift) << 2) & 0xfc) |
(((src_val >> src->green_shift) >> 4) & 0x03),
(((src_val >> src->blue_shift) << 3) & 0xf8) |
(((src_val >> src->blue_shift) >> 2) & 0x07) );
*dst_pixel++ = rgb_lookup_colortable(dst,
(((src_val >> src->red_shift) << 3) & 0xf8) |
(((src_val >> src->red_shift) >> 2) & 0x07),
(((src_val >> src->green_shift) << 2) & 0xfc) |
(((src_val >> src->green_shift) >> 4) & 0x03),
(((src_val >> src->blue_shift) << 3) & 0xf8) |
(((src_val >> src->blue_shift) >> 2) & 0x07) );
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;
@ -2567,10 +2573,10 @@ static void convert_to_8(dib_info *dst, const dib_info *src, const RECT *src_rec
for(x = src_rect->left; x < src_rect->right; x++)
{
src_val = *src_pixel++;
*dst_pixel++ = rgb_to_pixel_colortable(dst,
get_field(src_val, src->red_shift, src->red_len),
get_field(src_val, src->green_shift, src->green_len),
get_field(src_val, src->blue_shift, src->blue_len));
*dst_pixel++ = rgb_lookup_colortable(dst,
get_field(src_val, src->red_shift, src->red_len),
get_field(src_val, src->green_shift, src->green_len),
get_field(src_val, src->blue_shift, src->blue_len));
}
if(pad_size) memset(dst_pixel, 0, pad_size);
dst_start += dst->stride;