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Diffstat (limited to 'distrib/sdl-1.2.12/src/video/SDL_stretch.c')
-rw-r--r--distrib/sdl-1.2.12/src/video/SDL_stretch.c334
1 files changed, 0 insertions, 334 deletions
diff --git a/distrib/sdl-1.2.12/src/video/SDL_stretch.c b/distrib/sdl-1.2.12/src/video/SDL_stretch.c
deleted file mode 100644
index 2e08c10..0000000
--- a/distrib/sdl-1.2.12/src/video/SDL_stretch.c
+++ /dev/null
@@ -1,334 +0,0 @@
-/*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997-2006 Sam Lantinga
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
- Sam Lantinga
- slouken@libsdl.org
-*/
-#include "SDL_config.h"
-
-/* This a stretch blit implementation based on ideas given to me by
- Tomasz Cejner - thanks! :)
-
- April 27, 2000 - Sam Lantinga
-*/
-
-#include "SDL_video.h"
-#include "SDL_blit.h"
-
-/* This isn't ready for general consumption yet - it should be folded
- into the general blitting mechanism.
-*/
-
-#if ((defined(_MFC_VER) && defined(_M_IX86)/* && !defined(_WIN32_WCE) still needed? */) || \
- defined(__WATCOMC__) || \
- (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES
-#define USE_ASM_STRETCH
-#endif
-
-#ifdef USE_ASM_STRETCH
-
-#if defined(_M_IX86) || defined(i386)
-#define PREFIX16 0x66
-#define STORE_BYTE 0xAA
-#define STORE_WORD 0xAB
-#define LOAD_BYTE 0xAC
-#define LOAD_WORD 0xAD
-#define RETURN 0xC3
-#else
-#error Need assembly opcodes for this architecture
-#endif
-
-static unsigned char copy_row[4096];
-
-static int generate_rowbytes(int src_w, int dst_w, int bpp)
-{
- static struct {
- int bpp;
- int src_w;
- int dst_w;
- } last;
-
- int i;
- int pos, inc;
- unsigned char *eip;
- unsigned char load, store;
-
- /* See if we need to regenerate the copy buffer */
- if ( (src_w == last.src_w) &&
- (dst_w == last.dst_w) && (bpp == last.bpp) ) {
- return(0);
- }
- last.bpp = bpp;
- last.src_w = src_w;
- last.dst_w = dst_w;
-
- switch (bpp) {
- case 1:
- load = LOAD_BYTE;
- store = STORE_BYTE;
- break;
- case 2:
- case 4:
- load = LOAD_WORD;
- store = STORE_WORD;
- break;
- default:
- SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
- return(-1);
- }
- pos = 0x10000;
- inc = (src_w << 16) / dst_w;
- eip = copy_row;
- for ( i=0; i<dst_w; ++i ) {
- while ( pos >= 0x10000L ) {
- if ( bpp == 2 ) {
- *eip++ = PREFIX16;
- }
- *eip++ = load;
- pos -= 0x10000L;
- }
- if ( bpp == 2 ) {
- *eip++ = PREFIX16;
- }
- *eip++ = store;
- pos += inc;
- }
- *eip++ = RETURN;
-
- /* Verify that we didn't overflow (too late) */
- if ( eip > (copy_row+sizeof(copy_row)) ) {
- SDL_SetError("Copy buffer overflow");
- return(-1);
- }
- return(0);
-}
-
-#else
-
-#define DEFINE_COPY_ROW(name, type) \
-void name(type *src, int src_w, type *dst, int dst_w) \
-{ \
- int i; \
- int pos, inc; \
- type pixel = 0; \
- \
- pos = 0x10000; \
- inc = (src_w << 16) / dst_w; \
- for ( i=dst_w; i>0; --i ) { \
- while ( pos >= 0x10000L ) { \
- pixel = *src++; \
- pos -= 0x10000L; \
- } \
- *dst++ = pixel; \
- pos += inc; \
- } \
-}
-DEFINE_COPY_ROW(copy_row1, Uint8)
-DEFINE_COPY_ROW(copy_row2, Uint16)
-DEFINE_COPY_ROW(copy_row4, Uint32)
-
-#endif /* USE_ASM_STRETCH */
-
-/* The ASM code doesn't handle 24-bpp stretch blits */
-void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
-{
- int i;
- int pos, inc;
- Uint8 pixel[3] = { 0, 0, 0 };
-
- pos = 0x10000;
- inc = (src_w << 16) / dst_w;
- for ( i=dst_w; i>0; --i ) {
- while ( pos >= 0x10000L ) {
- pixel[0] = *src++;
- pixel[1] = *src++;
- pixel[2] = *src++;
- pos -= 0x10000L;
- }
- *dst++ = pixel[0];
- *dst++ = pixel[1];
- *dst++ = pixel[2];
- pos += inc;
- }
-}
-
-/* Perform a stretch blit between two surfaces of the same format.
- NOTE: This function is not safe to call from multiple threads!
-*/
-int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
- SDL_Surface *dst, SDL_Rect *dstrect)
-{
- int src_locked;
- int dst_locked;
- int pos, inc;
- int dst_width;
- int dst_maxrow;
- int src_row, dst_row;
- Uint8 *srcp = NULL;
- Uint8 *dstp;
- SDL_Rect full_src;
- SDL_Rect full_dst;
-#if defined(USE_ASM_STRETCH) && defined(__GNUC__)
- int u1, u2;
-#endif
- const int bpp = dst->format->BytesPerPixel;
-
- if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) {
- SDL_SetError("Only works with same format surfaces");
- return(-1);
- }
-
- /* Verify the blit rectangles */
- if ( srcrect ) {
- if ( (srcrect->x < 0) || (srcrect->y < 0) ||
- ((srcrect->x+srcrect->w) > src->w) ||
- ((srcrect->y+srcrect->h) > src->h) ) {
- SDL_SetError("Invalid source blit rectangle");
- return(-1);
- }
- } else {
- full_src.x = 0;
- full_src.y = 0;
- full_src.w = src->w;
- full_src.h = src->h;
- srcrect = &full_src;
- }
- if ( dstrect ) {
- if ( (dstrect->x < 0) || (dstrect->y < 0) ||
- ((dstrect->x+dstrect->w) > dst->w) ||
- ((dstrect->y+dstrect->h) > dst->h) ) {
- SDL_SetError("Invalid destination blit rectangle");
- return(-1);
- }
- } else {
- full_dst.x = 0;
- full_dst.y = 0;
- full_dst.w = dst->w;
- full_dst.h = dst->h;
- dstrect = &full_dst;
- }
-
- /* Lock the destination if it's in hardware */
- dst_locked = 0;
- if ( SDL_MUSTLOCK(dst) ) {
- if ( SDL_LockSurface(dst) < 0 ) {
- SDL_SetError("Unable to lock destination surface");
- return(-1);
- }
- dst_locked = 1;
- }
- /* Lock the source if it's in hardware */
- src_locked = 0;
- if ( SDL_MUSTLOCK(src) ) {
- if ( SDL_LockSurface(src) < 0 ) {
- if ( dst_locked ) {
- SDL_UnlockSurface(dst);
- }
- SDL_SetError("Unable to lock source surface");
- return(-1);
- }
- src_locked = 1;
- }
-
- /* Set up the data... */
- pos = 0x10000;
- inc = (srcrect->h << 16) / dstrect->h;
- src_row = srcrect->y;
- dst_row = dstrect->y;
- dst_width = dstrect->w*bpp;
-
-#ifdef USE_ASM_STRETCH
- /* Write the opcodes for this stretch */
- if ( (bpp != 3) &&
- (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) {
- return(-1);
- }
-#endif
-
- /* Perform the stretch blit */
- for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) {
- dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch)
- + (dstrect->x*bpp);
- while ( pos >= 0x10000L ) {
- srcp = (Uint8 *)src->pixels + (src_row*src->pitch)
- + (srcrect->x*bpp);
- ++src_row;
- pos -= 0x10000L;
- }
-#ifdef USE_ASM_STRETCH
- switch (bpp) {
- case 3:
- copy_row3(srcp, srcrect->w, dstp, dstrect->w);
- break;
- default:
-#ifdef __GNUC__
- __asm__ __volatile__ (
- "call *%4"
- : "=&D" (u1), "=&S" (u2)
- : "0" (dstp), "1" (srcp), "r" (copy_row)
- : "memory" );
-#elif defined(_MSC_VER) || defined(__WATCOMC__)
- { void *code = copy_row;
- __asm {
- push edi
- push esi
-
- mov edi, dstp
- mov esi, srcp
- call dword ptr code
-
- pop esi
- pop edi
- }
- }
-#else
-#error Need inline assembly for this compiler
-#endif
- break;
- }
-#else
- switch (bpp) {
- case 1:
- copy_row1(srcp, srcrect->w, dstp, dstrect->w);
- break;
- case 2:
- copy_row2((Uint16 *)srcp, srcrect->w,
- (Uint16 *)dstp, dstrect->w);
- break;
- case 3:
- copy_row3(srcp, srcrect->w, dstp, dstrect->w);
- break;
- case 4:
- copy_row4((Uint32 *)srcp, srcrect->w,
- (Uint32 *)dstp, dstrect->w);
- break;
- }
-#endif
- pos += inc;
- }
-
- /* We need to unlock the surfaces if they're locked */
- if ( dst_locked ) {
- SDL_UnlockSurface(dst);
- }
- if ( src_locked ) {
- SDL_UnlockSurface(src);
- }
- return(0);
-}
-
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