src/video/SDL_blit.c
author Edgar Simo <bobbens@gmail.com>
Mon, 04 Aug 2008 11:30:16 +0000
branchgsoc2008_force_feedback
changeset 2582 9f0f0a532343
parent 2329 c1a390f6a819
child 2801 5eb95b8adc1a
permissions -rw-r--r--
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_blit_auto.h"
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#include "SDL_blit_copy.h"
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#include "SDL_RLEaccel_c.h"
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#include "SDL_pixels_c.h"
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/* The general purpose software blit routine */
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static int
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SDL_SoftBlit(SDL_Surface * src, SDL_Rect * srcrect,
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             SDL_Surface * dst, SDL_Rect * dstrect)
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{
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    int okay;
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    int src_locked;
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    int dst_locked;
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    /* Everything is okay at the beginning...  */
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    okay = 1;
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    /* Lock the destination if it's in hardware */
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    dst_locked = 0;
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    if (SDL_MUSTLOCK(dst)) {
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        if (SDL_LockSurface(dst) < 0) {
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            okay = 0;
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        } else {
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            dst_locked = 1;
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        }
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    }
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    /* Lock the source if it's in hardware */
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    src_locked = 0;
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    if (SDL_MUSTLOCK(src)) {
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        if (SDL_LockSurface(src) < 0) {
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            okay = 0;
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        } else {
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            src_locked = 1;
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        }
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    }
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    /* Set up source and destination buffer pointers, and BLIT! */
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    if (okay && srcrect->w && srcrect->h) {
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        SDL_BlitFunc RunBlit;
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        SDL_BlitInfo *info = &src->map->info;
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        /* Set up the blit information */
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        info->src = (Uint8 *) src->pixels +
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            (Uint16) srcrect->y * src->pitch +
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            (Uint16) srcrect->x * info->src_fmt->BytesPerPixel;
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        info->src_w = srcrect->w;
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        info->src_h = srcrect->h;
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        info->src_skip =
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            info->src_pitch - info->src_w * info->src_fmt->BytesPerPixel;
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        info->dst =
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            (Uint8 *) dst->pixels + (Uint16) dstrect->y * dst->pitch +
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            (Uint16) dstrect->x * info->dst_fmt->BytesPerPixel;
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        info->dst_w = dstrect->w;
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        info->dst_h = dstrect->h;
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        info->dst_skip =
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            info->dst_pitch - info->dst_w * info->dst_fmt->BytesPerPixel;
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        RunBlit = (SDL_BlitFunc) src->map->data;
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        /* Run the actual software blit */
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        RunBlit(info);
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    }
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    /* We need to unlock the surfaces if they're locked */
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    if (dst_locked) {
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        SDL_UnlockSurface(dst);
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    }
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    if (src_locked) {
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        SDL_UnlockSurface(src);
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    }
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    /* Blit is done! */
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    return (okay ? 0 : -1);
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}
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#ifdef __MACOSX__
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#include <sys/sysctl.h>
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static SDL_bool
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SDL_UseAltivecPrefetch()
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{
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    const char key[] = "hw.l3cachesize";
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    u_int64_t result = 0;
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    size_t typeSize = sizeof(result);
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    if (sysctlbyname(key, &result, &typeSize, NULL, 0) == 0 && result > 0) {
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        return SDL_TRUE;
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    } else {
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        return SDL_FALSE;
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    }
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}
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#else
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static SDL_bool
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SDL_UseAltivecPrefetch()
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{
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    /* Just guess G4 */
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    return SDL_TRUE;
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}
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#endif /* __MACOSX__ */
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static SDL_BlitFunc
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   126
SDL_ChooseBlitFunc(Uint32 src_format, Uint32 dst_format, int flags,
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   127
                   SDL_BlitFuncEntry * entries)
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diff changeset
   128
{
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   129
    int i, flagcheck;
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   130
    static Uint32 features = 0xffffffff;
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diff changeset
   131
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   132
    /* Get the available CPU features */
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   133
    if (features == 0xffffffff) {
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   134
        const char *override = SDL_getenv("SDL_BLIT_CPU_FEATURES");
2250
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diff changeset
   135
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   136
        features = SDL_CPU_ANY;
0
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diff changeset
   137
2250
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diff changeset
   138
        /* Allow an override for testing .. */
2247
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diff changeset
   139
        if (override) {
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   140
            SDL_sscanf(override, "%u", &features);
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diff changeset
   141
        } else {
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diff changeset
   142
            if (SDL_HasMMX()) {
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diff changeset
   143
                features |= SDL_CPU_MMX;
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diff changeset
   144
            }
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diff changeset
   145
            if (SDL_Has3DNow()) {
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diff changeset
   146
                features |= SDL_CPU_3DNOW;
2247
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diff changeset
   147
            }
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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diff changeset
   148
            if (SDL_HasSSE()) {
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   149
                features |= SDL_CPU_SSE;
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diff changeset
   150
            }
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diff changeset
   151
            if (SDL_HasSSE2()) {
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diff changeset
   152
                features |= SDL_CPU_SSE2;
2247
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diff changeset
   153
            }
2250
e1d228456537 Fixed a few compiler warnings.
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diff changeset
   154
            if (SDL_HasAltiVec()) {
2247
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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parents: 1895
diff changeset
   155
                if (SDL_UseAltivecPrefetch()) {
2262
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diff changeset
   156
                    features |= SDL_CPU_ALTIVEC_PREFETCH;
2247
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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diff changeset
   157
                } else {
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diff changeset
   158
                    features |= SDL_CPU_ALTIVEC_NOPREFETCH;
2247
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parents: 1895
diff changeset
   159
                }
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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diff changeset
   160
            }
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   161
        }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
   162
    }
2247
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parents: 1895
diff changeset
   163
2263
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diff changeset
   164
    for (i = 0; entries[i].func; ++i) {
2265
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parents: 2263
diff changeset
   165
        /* Check for matching pixel formats */
2262
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parents: 2260
diff changeset
   166
        if (src_format != entries[i].src_format) {
bee005ace1bf Work in progress: merging new texture features into SDL blit system
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diff changeset
   167
            continue;
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parents: 2260
diff changeset
   168
        }
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diff changeset
   169
        if (dst_format != entries[i].dst_format) {
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diff changeset
   170
            continue;
2247
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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diff changeset
   171
        }
2265
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diff changeset
   172
265bb136af92 More work in progress...
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diff changeset
   173
        /* Check modulation flags */
2267
c785543d1843 Okay, still some bugs, but everything builds again...
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diff changeset
   174
        flagcheck =
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diff changeset
   175
            (flags & (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_COLOR));
2265
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diff changeset
   176
        if ((flagcheck & entries[i].flags) != flagcheck) {
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diff changeset
   177
            continue;
265bb136af92 More work in progress...
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diff changeset
   178
        }
265bb136af92 More work in progress...
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diff changeset
   179
265bb136af92 More work in progress...
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diff changeset
   180
        /* Check blend flags */
2267
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diff changeset
   181
        flagcheck =
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
diff changeset
   182
            (flags &
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
diff changeset
   183
             (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD));
2265
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parents: 2263
diff changeset
   184
        if ((flagcheck & entries[i].flags) != flagcheck) {
2262
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diff changeset
   185
            continue;
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parents: 2260
diff changeset
   186
        }
2265
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diff changeset
   187
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   188
        /* Check colorkey flag */
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   189
        flagcheck = (flags & SDL_COPY_COLORKEY);
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   190
        if ((flagcheck & entries[i].flags) != flagcheck) {
2262
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parents: 2260
diff changeset
   191
            continue;
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parents: 2260
diff changeset
   192
        }
2265
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   193
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   194
        /* Check scaling flags */
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   195
        flagcheck = (flags & SDL_COPY_NEAREST);
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   196
        if ((flagcheck & entries[i].flags) != flagcheck) {
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   197
            continue;
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   198
        }
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   199
265bb136af92 More work in progress...
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diff changeset
   200
        /* Check CPU features */
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   201
        flagcheck = entries[i].cpu;
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   202
        if ((flagcheck & features) != flagcheck) {
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   203
            continue;
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   204
        }
265bb136af92 More work in progress...
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parents: 2263
diff changeset
   205
265bb136af92 More work in progress...
Sam Lantinga <slouken@libsdl.org>
parents: 2263
diff changeset
   206
        /* We found the best one! */
2262
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parents: 2260
diff changeset
   207
        return entries[i].func;
2247
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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parents: 1895
diff changeset
   208
    }
2262
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diff changeset
   209
    return NULL;
0
74212992fb08 Initial revision
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parents:
diff changeset
   210
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   211
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   212
/* Figure out which of many blit routines to set up on a surface */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
   213
int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
   214
SDL_CalculateBlit(SDL_Surface * surface)
0
74212992fb08 Initial revision
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parents:
diff changeset
   215
{
2262
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diff changeset
   216
    SDL_BlitFunc blit = NULL;
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   217
    SDL_BlitMap *map = surface->map;
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
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parents: 2265
diff changeset
   218
    SDL_Surface *dst = map->dst;
0
74212992fb08 Initial revision
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parents:
diff changeset
   219
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   220
    /* Clean everything out to start */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   221
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   222
        SDL_UnRLESurface(surface, 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   223
    }
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   224
    map->blit = SDL_SoftBlit;
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   225
    map->info.src_fmt = surface->format;
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   226
    map->info.src_pitch = surface->pitch;
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   227
    map->info.dst_fmt = dst->format;
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   228
    map->info.dst_pitch = dst->pitch;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   229
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
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parents: 2265
diff changeset
   230
    /* See if we can do RLE acceleration */
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   231
    if (surface->map->info.flags & SDL_COPY_RLE_DESIRED) {
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   232
        if (SDL_RLESurface(surface) == 0) {
2329
c1a390f6a819 ran make indent
Bob Pendleton <bob@pendleton.com>
parents: 2328
diff changeset
   233
            surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   234
            return 0;
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   235
        }
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   236
    }
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   237
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   238
    /* Choose a standard blit function */
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   239
    if (map->identity && !map->info.flags) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   240
        /* Handle overlapping blits on the same surface */
2263
900c35d8e8fd More work in progress, still doesn't compile...
Sam Lantinga <slouken@libsdl.org>
parents: 2262
diff changeset
   241
        if (surface == dst) {
2257
340942cfda48 Moved the colorkey and per-surface alpha into the blit info,
Sam Lantinga <slouken@libsdl.org>
parents: 2255
diff changeset
   242
            blit = SDL_BlitCopyOverlap;
2247
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
   243
        } else {
2257
340942cfda48 Moved the colorkey and per-surface alpha into the blit info,
Sam Lantinga <slouken@libsdl.org>
parents: 2255
diff changeset
   244
            blit = SDL_BlitCopy;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   245
        }
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   246
    } else if (surface->format->BitsPerPixel < 8) {
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   247
        blit = SDL_CalculateBlit0(surface);
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
Sam Lantinga <slouken@libsdl.org>
parents: 2265
diff changeset
   248
    } else if (surface->format->BytesPerPixel == 1) {
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   249
        blit = SDL_CalculateBlit1(surface);
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   250
    } else if (map->info.flags & SDL_COPY_BLEND) {
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   251
        blit = SDL_CalculateBlitA(surface);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   252
    } else {
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   253
        blit = SDL_CalculateBlitN(surface);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   254
    }
2262
bee005ace1bf Work in progress: merging new texture features into SDL blit system
Sam Lantinga <slouken@libsdl.org>
parents: 2260
diff changeset
   255
    if (blit == NULL) {
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2266
diff changeset
   256
        Uint32 src_format =
c785543d1843 Okay, still some bugs, but everything builds again...
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            SDL_MasksToPixelFormatEnum(surface->format->BitsPerPixel,
c785543d1843 Okay, still some bugs, but everything builds again...
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                                       surface->format->Rmask,
c785543d1843 Okay, still some bugs, but everything builds again...
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   259
                                       surface->format->Gmask,
c785543d1843 Okay, still some bugs, but everything builds again...
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                                       surface->format->Bmask,
c785543d1843 Okay, still some bugs, but everything builds again...
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                                       surface->format->Amask);
c785543d1843 Okay, still some bugs, but everything builds again...
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   262
        Uint32 dst_format =
c785543d1843 Okay, still some bugs, but everything builds again...
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   263
            SDL_MasksToPixelFormatEnum(dst->format->BitsPerPixel,
2329
c1a390f6a819 ran make indent
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                                       dst->format->Rmask,
2328
91e601d9df8b re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being
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parents: 2267
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                                       dst->format->Gmask,
2267
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
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   266
                                       dst->format->Bmask,
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
diff changeset
   267
                                       dst->format->Amask);
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
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   268
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
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        blit =
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
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   270
            SDL_ChooseBlitFunc(src_format, dst_format, map->info.flags,
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
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   271
                               SDL_GeneratedBlitFuncTable);
2262
bee005ace1bf Work in progress: merging new texture features into SDL blit system
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parents: 2260
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    }
2267
c785543d1843 Okay, still some bugs, but everything builds again...
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parents: 2266
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    map->data = blit;
2262
bee005ace1bf Work in progress: merging new texture features into SDL blit system
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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    /* Make sure we have a blit function */
2257
340942cfda48 Moved the colorkey and per-surface alpha into the blit info,
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    if (blit == NULL) {
2266
e61ad15a205f More work in progress integrating SDL_Surface and the new SDL_Texture API
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        SDL_InvalidateMap(map);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
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        SDL_SetError("Blit combination not supported");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
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        return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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    }
0
74212992fb08 Initial revision
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parents:
diff changeset
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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    return (0);
0
74212992fb08 Initial revision
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parents:
diff changeset
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}
74212992fb08 Initial revision
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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/* vi: set ts=4 sw=4 expandtab: */