Sweden-Number/dlls/ddraw/convert.c

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7.4 KiB
C
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#include "ddraw_private.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(ddraw);
/* *************************************
16 / 15 bpp to palettized 8 bpp
************************************* */
static void pixel_convert_16_to_8(void *src, void *dst, DWORD width, DWORD height, LONG pitch, IDirectDrawPaletteImpl* palette) {
unsigned char *c_src = (unsigned char *) src;
unsigned short *c_dst = (unsigned short *) dst;
int y;
if (palette != NULL) {
const unsigned int * pal = (unsigned int *) palette->screen_palents;
for (y = height; y--; ) {
#if defined(__i386__) && defined(__GNUC__)
/* gcc generates slightly inefficient code for the the copy/lookup,
* it generates one excess memory access (to pal) per pixel. Since
* we know that pal is not modified by the memory write we can
* put it into a register and reduce the number of memory accesses
* from 4 to 3 pp. There are two xor eax,eax to avoid pipeline
* stalls. (This is not guaranteed to be the fastest method.)
*/
__asm__ __volatile__(
"xor %%eax,%%eax\n"
"1:\n"
" lodsb\n"
" movw (%%edx,%%eax,4),%%ax\n"
" stosw\n"
" xor %%eax,%%eax\n"
" loop 1b\n"
: "=S" (c_src), "=D" (c_dst)
: "S" (c_src), "D" (c_dst) , "c" (width), "d" (pal)
: "eax", "cc", "memory"
);
c_src+=(pitch-width);
#else
unsigned char * srclineend = c_src+width;
while (c_src < srclineend)
*c_dst++ = pal[*c_src++];
c_src+=(pitch-width);
#endif
}
} else {
FIXME("No palette set...\n");
memset(dst, 0, width * height * 2);
}
}
static void palette_convert_16_to_8(
LPPALETTEENTRY palent, void *screen_palette, DWORD start, DWORD count
) {
int i;
unsigned int *pal = (unsigned int *) screen_palette;
for (i = 0; i < count; i++)
pal[start + i] = (((((unsigned short) palent[i].peRed) & 0xF8) << 8) |
((((unsigned short) palent[i].peBlue) & 0xF8) >> 3) |
((((unsigned short) palent[i].peGreen) & 0xFC) << 3));
}
static void palette_convert_15_to_8(
LPPALETTEENTRY palent, void *screen_palette, DWORD start, DWORD count
) {
int i;
unsigned int *pal = (unsigned int *) screen_palette;
for (i = 0; i < count; i++)
pal[start + i] = (((((unsigned short) palent[i].peRed) & 0xF8) << 7) |
((((unsigned short) palent[i].peBlue) & 0xF8) >> 3) |
((((unsigned short) palent[i].peGreen) & 0xF8) << 2));
}
/* *************************************
24 to palettized 8 bpp
************************************* */
static void pixel_convert_24_to_8(
void *src, void *dst, DWORD width, DWORD height, LONG pitch,
IDirectDrawPaletteImpl* palette
) {
unsigned char *c_src = (unsigned char *) src;
unsigned char *c_dst = (unsigned char *) dst;
int y;
if (palette != NULL) {
const unsigned int *pal = (unsigned int *) palette->screen_palents;
for (y = height; y--; ) {
unsigned char * srclineend = c_src+width;
while (c_src < srclineend ) {
register long pixel = pal[*c_src++];
*c_dst++ = pixel;
*c_dst++ = pixel>>8;
*c_dst++ = pixel>>16;
}
c_src+=(pitch-width);
}
} else {
FIXME("No palette set...\n");
memset(dst, 0, width * height * 3);
}
}
/* *************************************
32 bpp to palettized 8 bpp
************************************* */
static void pixel_convert_32_to_8(
void *src, void *dst, DWORD width, DWORD height, LONG pitch,
IDirectDrawPaletteImpl* palette
) {
unsigned char *c_src = (unsigned char *) src;
unsigned int *c_dst = (unsigned int *) dst;
int y;
if (palette != NULL) {
const unsigned int *pal = (unsigned int *) palette->screen_palents;
for (y = height; y--; ) {
#if defined(__i386__) && defined(__GNUC__)
/* See comment in pixel_convert_16_to_8 */
__asm__ __volatile__(
"xor %%eax,%%eax\n"
"1:\n"
" lodsb\n"
" movl (%%edx,%%eax,4),%%eax\n"
" stosl\n"
" xor %%eax,%%eax\n"
" loop 1b\n"
: "=S" (c_src), "=D" (c_dst)
: "S" (c_src), "D" (c_dst) , "c" (width), "d" (pal)
: "eax", "cc", "memory"
);
c_src+=(pitch-width);
#else
unsigned char * srclineend = c_src+width;
while (c_src < srclineend )
*c_dst++ = pal[*c_src++];
c_src+=(pitch-width);
#endif
}
} else {
FIXME("No palette set...\n");
memset(dst, 0, width * height * 4);
}
}
static void palette_convert_24_to_8(
LPPALETTEENTRY palent, void *screen_palette, DWORD start, DWORD count
) {
int i;
unsigned int *pal = (unsigned int *) screen_palette;
for (i = 0; i < count; i++)
pal[start + i] = ((((unsigned int) palent[i].peRed) << 16) |
(((unsigned int) palent[i].peGreen) << 8) |
((unsigned int) palent[i].peBlue));
}
/* *************************************
16 bpp to 15 bpp
************************************* */
static void pixel_convert_15_to_16(
void *src, void *dst, DWORD width, DWORD height, LONG pitch,
IDirectDrawPaletteImpl* palette
) {
unsigned short *c_src = (unsigned short *) src;
unsigned short *c_dst = (unsigned short *) dst;
int y;
for (y = height; y--; ) {
unsigned short * srclineend = c_src+width;
while (c_src < srclineend ) {
unsigned short val = *c_src++;
*c_dst++=((val&0xFFC0)>>1)|(val&0x001f);
}
c_src+=((pitch/2)-width);
}
}
/* *************************************
32 bpp to 16 bpp
************************************* */
static void pixel_convert_32_to_16(
void *src, void *dst, DWORD width, DWORD height, LONG pitch,
IDirectDrawPaletteImpl* palette
) {
unsigned short *c_src = (unsigned short *) src;
unsigned int *c_dst = (unsigned int *) dst;
int y;
for (y = height; y--; ) {
unsigned short * srclineend = c_src+width;
while (c_src < srclineend ) {
*c_dst++ = (((*c_src & 0xF800) << 8) |
((*c_src & 0x07E0) << 5) |
((*c_src & 0x001F) << 3));
c_src++;
}
c_src+=((pitch/2)-width);
}
}
/* *************************************
32 bpp to 24 bpp
************************************* */
static void pixel_convert_32_to_24(
void *src, void *dst, DWORD width, DWORD height, LONG pitch,
IDirectDrawPaletteImpl* palette
) {
unsigned char *c_src = (unsigned char *) src;
unsigned int *c_dst = (unsigned int *) dst;
int y;
for (y = height; y--; ) {
unsigned char * srclineend = c_src+width*3;
while (c_src < srclineend ) {
/* FIXME: wrong for big endian */
memcpy(c_dst,c_src,3);
c_src+=3;
c_dst++;
}
c_src+=pitch-width*3;
}
}
Convert ModeEmulations[7] = {
{ { 32, 24, 0x00FF0000, 0x0000FF00, 0x000000FF }, { 24, 24, 0xFF0000, 0x0000FF00, 0x00FF }, { pixel_convert_32_to_24, NULL } },
{ { 32, 24, 0x00FF0000, 0x0000FF00, 0x000000FF }, { 8, 8, 0x00, 0x00, 0x00 }, { pixel_convert_32_to_8, palette_convert_24_to_8 } },
{ { 32, 24, 0x00FF0000, 0x0000FF00, 0x000000FF }, { 16, 16, 0xF800, 0x07E0, 0x001F }, { pixel_convert_32_to_16, NULL } },
{ { 24, 24, 0xFF0000, 0x00FF00, 0x0000FF }, { 8, 8, 0x00, 0x00, 0x00 }, { pixel_convert_24_to_8, palette_convert_24_to_8 } },
{ { 16, 15, 0x7C00, 0x03E0, 0x001F }, { 16,16, 0xf800, 0x07e0, 0x001f }, { pixel_convert_15_to_16, NULL } },
{ { 16, 16, 0xF800, 0x07E0, 0x001F }, { 8, 8, 0x00, 0x00, 0x00 }, { pixel_convert_16_to_8, palette_convert_16_to_8 } },
{ { 16, 15, 0x7C00, 0x03E0, 0x001F }, { 8, 8, 0x00, 0x00, 0x00 }, { pixel_convert_16_to_8, palette_convert_15_to_8 } },
};