diff options
Diffstat (limited to 'source/3rd-party/SDL2/src/video/SDL_surface.c')
| -rw-r--r-- | source/3rd-party/SDL2/src/video/SDL_surface.c | 1246 |
1 files changed, 1246 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/video/SDL_surface.c b/source/3rd-party/SDL2/src/video/SDL_surface.c new file mode 100644 index 0000000..1b2ee6c --- /dev/null +++ b/source/3rd-party/SDL2/src/video/SDL_surface.c @@ -0,0 +1,1246 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ +#include "../SDL_internal.h" + +#include "SDL_video.h" +#include "SDL_sysvideo.h" +#include "SDL_blit.h" +#include "SDL_RLEaccel_c.h" +#include "SDL_pixels_c.h" +#include "SDL_yuv_c.h" + + +/* Check to make sure we can safely check multiplication of surface w and pitch and it won't overflow size_t */ +SDL_COMPILE_TIME_ASSERT(surface_size_assumptions, + sizeof(int) == sizeof(Sint32) && sizeof(size_t) >= sizeof(Sint32)); + +/* Public routines */ + +/* + * Calculate the pad-aligned scanline width of a surface + */ +static int +SDL_CalculatePitch(Uint32 format, int width) +{ + int pitch; + + /* Surface should be 4-byte aligned for speed */ + pitch = width * SDL_BYTESPERPIXEL(format); + switch (SDL_BITSPERPIXEL(format)) { + case 1: + pitch = (pitch + 7) / 8; + break; + case 4: + pitch = (pitch + 1) / 2; + break; + default: + break; + } + pitch = (pitch + 3) & ~3; /* 4-byte aligning */ + return pitch; +} + +/* + * Create an empty RGB surface of the appropriate depth using the given + * enum SDL_PIXELFORMAT_* format + */ +SDL_Surface * +SDL_CreateRGBSurfaceWithFormat(Uint32 flags, int width, int height, int depth, + Uint32 format) +{ + SDL_Surface *surface; + + /* The flags are no longer used, make the compiler happy */ + (void)flags; + + /* Allocate the surface */ + surface = (SDL_Surface *) SDL_calloc(1, sizeof(*surface)); + if (surface == NULL) { + SDL_OutOfMemory(); + return NULL; + } + + surface->format = SDL_AllocFormat(format); + if (!surface->format) { + SDL_FreeSurface(surface); + return NULL; + } + surface->w = width; + surface->h = height; + surface->pitch = SDL_CalculatePitch(format, width); + SDL_SetClipRect(surface, NULL); + + if (SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) { + SDL_Palette *palette = + SDL_AllocPalette((1 << surface->format->BitsPerPixel)); + if (!palette) { + SDL_FreeSurface(surface); + return NULL; + } + if (palette->ncolors == 2) { + /* Create a black and white bitmap palette */ + palette->colors[0].r = 0xFF; + palette->colors[0].g = 0xFF; + palette->colors[0].b = 0xFF; + palette->colors[1].r = 0x00; + palette->colors[1].g = 0x00; + palette->colors[1].b = 0x00; + } + SDL_SetSurfacePalette(surface, palette); + SDL_FreePalette(palette); + } + + /* Get the pixels */ + if (surface->w && surface->h) { + /* Assumptions checked in surface_size_assumptions assert above */ + Sint64 size = ((Sint64)surface->h * surface->pitch); + if (size < 0 || size > SDL_MAX_SINT32) { + /* Overflow... */ + SDL_FreeSurface(surface); + SDL_OutOfMemory(); + return NULL; + } + + surface->pixels = SDL_malloc((size_t)size); + if (!surface->pixels) { + SDL_FreeSurface(surface); + SDL_OutOfMemory(); + return NULL; + } + /* This is important for bitmaps */ + SDL_memset(surface->pixels, 0, surface->h * surface->pitch); + } + + /* Allocate an empty mapping */ + surface->map = SDL_AllocBlitMap(); + if (!surface->map) { + SDL_FreeSurface(surface); + return NULL; + } + + /* By default surface with an alpha mask are set up for blending */ + if (surface->format->Amask) { + SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND); + } + + /* The surface is ready to go */ + surface->refcount = 1; + return surface; +} + +/* + * Create an empty RGB surface of the appropriate depth + */ +SDL_Surface * +SDL_CreateRGBSurface(Uint32 flags, + int width, int height, int depth, + Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) +{ + Uint32 format; + + /* Get the pixel format */ + format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask); + if (format == SDL_PIXELFORMAT_UNKNOWN) { + SDL_SetError("Unknown pixel format"); + return NULL; + } + + return SDL_CreateRGBSurfaceWithFormat(flags, width, height, depth, format); +} + +/* + * Create an RGB surface from an existing memory buffer + */ +SDL_Surface * +SDL_CreateRGBSurfaceFrom(void *pixels, + int width, int height, int depth, int pitch, + Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, + Uint32 Amask) +{ + SDL_Surface *surface; + + surface = SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask); + if (surface != NULL) { + surface->flags |= SDL_PREALLOC; + surface->pixels = pixels; + surface->w = width; + surface->h = height; + surface->pitch = pitch; + SDL_SetClipRect(surface, NULL); + } + return surface; +} + +/* + * Create an RGB surface from an existing memory buffer using the given given + * enum SDL_PIXELFORMAT_* format + */ +SDL_Surface * +SDL_CreateRGBSurfaceWithFormatFrom(void *pixels, + int width, int height, int depth, int pitch, + Uint32 format) +{ + SDL_Surface *surface; + + surface = SDL_CreateRGBSurfaceWithFormat(0, 0, 0, depth, format); + if (surface != NULL) { + surface->flags |= SDL_PREALLOC; + surface->pixels = pixels; + surface->w = width; + surface->h = height; + surface->pitch = pitch; + SDL_SetClipRect(surface, NULL); + } + return surface; +} + +int +SDL_SetSurfacePalette(SDL_Surface * surface, SDL_Palette * palette) +{ + if (!surface) { + return SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface"); + } + if (SDL_SetPixelFormatPalette(surface->format, palette) < 0) { + return -1; + } + SDL_InvalidateMap(surface->map); + + return 0; +} + +int +SDL_SetSurfaceRLE(SDL_Surface * surface, int flag) +{ + int flags; + + if (!surface) { + return -1; + } + + flags = surface->map->info.flags; + if (flag) { + surface->map->info.flags |= SDL_COPY_RLE_DESIRED; + } else { + surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED; + } + if (surface->map->info.flags != flags) { + SDL_InvalidateMap(surface->map); + } + return 0; +} + +int +SDL_SetColorKey(SDL_Surface * surface, int flag, Uint32 key) +{ + int flags; + + if (!surface) { + return SDL_InvalidParamError("surface"); + } + + if (surface->format->palette && key >= ((Uint32) surface->format->palette->ncolors)) { + return SDL_InvalidParamError("key"); + } + + if (flag & SDL_RLEACCEL) { + SDL_SetSurfaceRLE(surface, 1); + } + + flags = surface->map->info.flags; + if (flag) { + surface->map->info.flags |= SDL_COPY_COLORKEY; + surface->map->info.colorkey = key; + if (surface->format->palette) { + surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT; + ++surface->format->palette->version; + if (!surface->format->palette->version) { + surface->format->palette->version = 1; + } + } + } else { + if (surface->format->palette) { + surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_OPAQUE; + ++surface->format->palette->version; + if (!surface->format->palette->version) { + surface->format->palette->version = 1; + } + } + surface->map->info.flags &= ~SDL_COPY_COLORKEY; + } + if (surface->map->info.flags != flags) { + SDL_InvalidateMap(surface->map); + } + + return 0; +} + +SDL_bool +SDL_HasColorKey(SDL_Surface * surface) +{ + if (!surface) { + return SDL_FALSE; + } + + if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) { + return SDL_FALSE; + } + + return SDL_TRUE; +} + +int +SDL_GetColorKey(SDL_Surface * surface, Uint32 * key) +{ + if (!surface) { + return SDL_InvalidParamError("surface"); + } + + if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) { + return SDL_SetError("Surface doesn't have a colorkey"); + } + + if (key) { + *key = surface->map->info.colorkey; + } + return 0; +} + +/* This is a fairly slow function to switch from colorkey to alpha */ +static void +SDL_ConvertColorkeyToAlpha(SDL_Surface * surface) +{ + int x, y; + + if (!surface) { + return; + } + + if (!(surface->map->info.flags & SDL_COPY_COLORKEY) || + !surface->format->Amask) { + return; + } + + SDL_LockSurface(surface); + + switch (surface->format->BytesPerPixel) { + case 2: + { + Uint16 *row, *spot; + Uint16 ckey = (Uint16) surface->map->info.colorkey; + Uint16 mask = (Uint16) (~surface->format->Amask); + + /* Ignore alpha in colorkey comparison */ + ckey &= mask; + row = (Uint16 *) surface->pixels; + for (y = surface->h; y--;) { + spot = row; + for (x = surface->w; x--;) { + if ((*spot & mask) == ckey) { + *spot &= mask; + } + ++spot; + } + row += surface->pitch / 2; + } + } + break; + case 3: + /* FIXME */ + break; + case 4: + { + Uint32 *row, *spot; + Uint32 ckey = surface->map->info.colorkey; + Uint32 mask = ~surface->format->Amask; + + /* Ignore alpha in colorkey comparison */ + ckey &= mask; + row = (Uint32 *) surface->pixels; + for (y = surface->h; y--;) { + spot = row; + for (x = surface->w; x--;) { + if ((*spot & mask) == ckey) { + *spot &= mask; + } + ++spot; + } + row += surface->pitch / 4; + } + } + break; + } + + SDL_UnlockSurface(surface); + + SDL_SetColorKey(surface, 0, 0); + SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND); +} + +int +SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b) +{ + int flags; + + if (!surface) { + return -1; + } + + surface->map->info.r = r; + surface->map->info.g = g; + surface->map->info.b = b; + + flags = surface->map->info.flags; + if (r != 0xFF || g != 0xFF || b != 0xFF) { + surface->map->info.flags |= SDL_COPY_MODULATE_COLOR; + } else { + surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR; + } + if (surface->map->info.flags != flags) { + SDL_InvalidateMap(surface->map); + } + return 0; +} + + +int +SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b) +{ + if (!surface) { + return -1; + } + + if (r) { + *r = surface->map->info.r; + } + if (g) { + *g = surface->map->info.g; + } + if (b) { + *b = surface->map->info.b; + } + return 0; +} + +int +SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha) +{ + int flags; + + if (!surface) { + return -1; + } + + surface->map->info.a = alpha; + + flags = surface->map->info.flags; + if (alpha != 0xFF) { + surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA; + } else { + surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA; + } + if (surface->map->info.flags != flags) { + SDL_InvalidateMap(surface->map); + } + return 0; +} + +int +SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha) +{ + if (!surface) { + return -1; + } + + if (alpha) { + *alpha = surface->map->info.a; + } + return 0; +} + +int +SDL_SetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode blendMode) +{ + int flags, status; + + if (!surface) { + return -1; + } + + status = 0; + flags = surface->map->info.flags; + surface->map->info.flags &= + ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD); + switch (blendMode) { + case SDL_BLENDMODE_NONE: + break; + case SDL_BLENDMODE_BLEND: + surface->map->info.flags |= SDL_COPY_BLEND; + break; + case SDL_BLENDMODE_ADD: + surface->map->info.flags |= SDL_COPY_ADD; + break; + case SDL_BLENDMODE_MOD: + surface->map->info.flags |= SDL_COPY_MOD; + break; + default: + status = SDL_Unsupported(); + break; + } + + if (surface->map->info.flags != flags) { + SDL_InvalidateMap(surface->map); + } + + return status; +} + +int +SDL_GetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode *blendMode) +{ + if (!surface) { + return -1; + } + + if (!blendMode) { + return 0; + } + + switch (surface->map-> + info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) { + case SDL_COPY_BLEND: + *blendMode = SDL_BLENDMODE_BLEND; + break; + case SDL_COPY_ADD: + *blendMode = SDL_BLENDMODE_ADD; + break; + case SDL_COPY_MOD: + *blendMode = SDL_BLENDMODE_MOD; + break; + default: + *blendMode = SDL_BLENDMODE_NONE; + break; + } + return 0; +} + +SDL_bool +SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect) +{ + SDL_Rect full_rect; + + /* Don't do anything if there's no surface to act on */ + if (!surface) { + return SDL_FALSE; + } + + /* Set up the full surface rectangle */ + full_rect.x = 0; + full_rect.y = 0; + full_rect.w = surface->w; + full_rect.h = surface->h; + + /* Set the clipping rectangle */ + if (!rect) { + surface->clip_rect = full_rect; + return SDL_TRUE; + } + return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); +} + +void +SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect) +{ + if (surface && rect) { + *rect = surface->clip_rect; + } +} + +/* + * Set up a blit between two surfaces -- split into three parts: + * The upper part, SDL_UpperBlit(), performs clipping and rectangle + * verification. The lower part is a pointer to a low level + * accelerated blitting function. + * + * These parts are separated out and each used internally by this + * library in the optimimum places. They are exported so that if + * you know exactly what you are doing, you can optimize your code + * by calling the one(s) you need. + */ +int +SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect, + SDL_Surface * dst, SDL_Rect * dstrect) +{ + /* Check to make sure the blit mapping is valid */ + if ((src->map->dst != dst) || + (dst->format->palette && + src->map->dst_palette_version != dst->format->palette->version) || + (src->format->palette && + src->map->src_palette_version != src->format->palette->version)) { + if (SDL_MapSurface(src, dst) < 0) { + return (-1); + } + /* just here for debugging */ +/* printf */ +/* ("src = 0x%08X src->flags = %08X src->map->info.flags = %08x\ndst = 0x%08X dst->flags = %08X dst->map->info.flags = %08X\nsrc->map->blit = 0x%08x\n", */ +/* src, dst->flags, src->map->info.flags, dst, dst->flags, */ +/* dst->map->info.flags, src->map->blit); */ + } + return (src->map->blit(src, srcrect, dst, dstrect)); +} + + +int +SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect, + SDL_Surface * dst, SDL_Rect * dstrect) +{ + SDL_Rect fulldst; + int srcx, srcy, w, h; + + /* Make sure the surfaces aren't locked */ + if (!src || !dst) { + return SDL_SetError("SDL_UpperBlit: passed a NULL surface"); + } + if (src->locked || dst->locked) { + return SDL_SetError("Surfaces must not be locked during blit"); + } + + /* If the destination rectangle is NULL, use the entire dest surface */ + if (dstrect == NULL) { + fulldst.x = fulldst.y = 0; + fulldst.w = dst->w; + fulldst.h = dst->h; + dstrect = &fulldst; + } + + /* clip the source rectangle to the source surface */ + if (srcrect) { + int maxw, maxh; + + srcx = srcrect->x; + w = srcrect->w; + if (srcx < 0) { + w += srcx; + dstrect->x -= srcx; + srcx = 0; + } + maxw = src->w - srcx; + if (maxw < w) + w = maxw; + + srcy = srcrect->y; + h = srcrect->h; + if (srcy < 0) { + h += srcy; + dstrect->y -= srcy; + srcy = 0; + } + maxh = src->h - srcy; + if (maxh < h) + h = maxh; + + } else { + srcx = srcy = 0; + w = src->w; + h = src->h; + } + + /* clip the destination rectangle against the clip rectangle */ + { + SDL_Rect *clip = &dst->clip_rect; + int dx, dy; + + dx = clip->x - dstrect->x; + if (dx > 0) { + w -= dx; + dstrect->x += dx; + srcx += dx; + } + dx = dstrect->x + w - clip->x - clip->w; + if (dx > 0) + w -= dx; + + dy = clip->y - dstrect->y; + if (dy > 0) { + h -= dy; + dstrect->y += dy; + srcy += dy; + } + dy = dstrect->y + h - clip->y - clip->h; + if (dy > 0) + h -= dy; + } + + /* Switch back to a fast blit if we were previously stretching */ + if (src->map->info.flags & SDL_COPY_NEAREST) { + src->map->info.flags &= ~SDL_COPY_NEAREST; + SDL_InvalidateMap(src->map); + } + + if (w > 0 && h > 0) { + SDL_Rect sr; + sr.x = srcx; + sr.y = srcy; + sr.w = dstrect->w = w; + sr.h = dstrect->h = h; + return SDL_LowerBlit(src, &sr, dst, dstrect); + } + dstrect->w = dstrect->h = 0; + return 0; +} + +int +SDL_UpperBlitScaled(SDL_Surface * src, const SDL_Rect * srcrect, + SDL_Surface * dst, SDL_Rect * dstrect) +{ + double src_x0, src_y0, src_x1, src_y1; + double dst_x0, dst_y0, dst_x1, dst_y1; + SDL_Rect final_src, final_dst; + double scaling_w, scaling_h; + int src_w, src_h; + int dst_w, dst_h; + + /* Make sure the surfaces aren't locked */ + if (!src || !dst) { + return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface"); + } + if (src->locked || dst->locked) { + return SDL_SetError("Surfaces must not be locked during blit"); + } + + if (NULL == srcrect) { + src_w = src->w; + src_h = src->h; + } else { + src_w = srcrect->w; + src_h = srcrect->h; + } + + if (NULL == dstrect) { + dst_w = dst->w; + dst_h = dst->h; + } else { + dst_w = dstrect->w; + dst_h = dstrect->h; + } + + if (dst_w == src_w && dst_h == src_h) { + /* No scaling, defer to regular blit */ + return SDL_BlitSurface(src, srcrect, dst, dstrect); + } + + scaling_w = (double)dst_w / src_w; + scaling_h = (double)dst_h / src_h; + + if (NULL == dstrect) { + dst_x0 = 0; + dst_y0 = 0; + dst_x1 = dst_w - 1; + dst_y1 = dst_h - 1; + } else { + dst_x0 = dstrect->x; + dst_y0 = dstrect->y; + dst_x1 = dst_x0 + dst_w - 1; + dst_y1 = dst_y0 + dst_h - 1; + } + + if (NULL == srcrect) { + src_x0 = 0; + src_y0 = 0; + src_x1 = src_w - 1; + src_y1 = src_h - 1; + } else { + src_x0 = srcrect->x; + src_y0 = srcrect->y; + src_x1 = src_x0 + src_w - 1; + src_y1 = src_y0 + src_h - 1; + + /* Clip source rectangle to the source surface */ + + if (src_x0 < 0) { + dst_x0 -= src_x0 * scaling_w; + src_x0 = 0; + } + + if (src_x1 >= src->w) { + dst_x1 -= (src_x1 - src->w + 1) * scaling_w; + src_x1 = src->w - 1; + } + + if (src_y0 < 0) { + dst_y0 -= src_y0 * scaling_h; + src_y0 = 0; + } + + if (src_y1 >= src->h) { + dst_y1 -= (src_y1 - src->h + 1) * scaling_h; + src_y1 = src->h - 1; + } + } + + /* Clip destination rectangle to the clip rectangle */ + + /* Translate to clip space for easier calculations */ + dst_x0 -= dst->clip_rect.x; + dst_x1 -= dst->clip_rect.x; + dst_y0 -= dst->clip_rect.y; + dst_y1 -= dst->clip_rect.y; + + if (dst_x0 < 0) { + src_x0 -= dst_x0 / scaling_w; + dst_x0 = 0; + } + + if (dst_x1 >= dst->clip_rect.w) { + src_x1 -= (dst_x1 - dst->clip_rect.w + 1) / scaling_w; + dst_x1 = dst->clip_rect.w - 1; + } + + if (dst_y0 < 0) { + src_y0 -= dst_y0 / scaling_h; + dst_y0 = 0; + } + + if (dst_y1 >= dst->clip_rect.h) { + src_y1 -= (dst_y1 - dst->clip_rect.h + 1) / scaling_h; + dst_y1 = dst->clip_rect.h - 1; + } + + /* Translate back to surface coordinates */ + dst_x0 += dst->clip_rect.x; + dst_x1 += dst->clip_rect.x; + dst_y0 += dst->clip_rect.y; + dst_y1 += dst->clip_rect.y; + + final_src.x = (int)SDL_floor(src_x0 + 0.5); + final_src.y = (int)SDL_floor(src_y0 + 0.5); + final_src.w = (int)SDL_floor(src_x1 + 1 + 0.5) - (int)SDL_floor(src_x0 + 0.5); + final_src.h = (int)SDL_floor(src_y1 + 1 + 0.5) - (int)SDL_floor(src_y0 + 0.5); + + final_dst.x = (int)SDL_floor(dst_x0 + 0.5); + final_dst.y = (int)SDL_floor(dst_y0 + 0.5); + final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5); + final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5); + + if (final_dst.w < 0) + final_dst.w = 0; + if (final_dst.h < 0) + final_dst.h = 0; + + if (dstrect) + *dstrect = final_dst; + + if (final_dst.w == 0 || final_dst.h == 0 || + final_src.w <= 0 || final_src.h <= 0) { + /* No-op. */ + return 0; + } + + return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst); +} + +/** + * This is a semi-private blit function and it performs low-level surface + * scaled blitting only. + */ +int +SDL_LowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect, + SDL_Surface * dst, SDL_Rect * dstrect) +{ + static const Uint32 complex_copy_flags = ( + SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA | + SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | + SDL_COPY_COLORKEY + ); + + if (!(src->map->info.flags & SDL_COPY_NEAREST)) { + src->map->info.flags |= SDL_COPY_NEAREST; + SDL_InvalidateMap(src->map); + } + + if ( !(src->map->info.flags & complex_copy_flags) && + src->format->format == dst->format->format && + !SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) { + return SDL_SoftStretch( src, srcrect, dst, dstrect ); + } else { + return SDL_LowerBlit( src, srcrect, dst, dstrect ); + } +} + +/* + * Lock a surface to directly access the pixels + */ +int +SDL_LockSurface(SDL_Surface * surface) +{ + if (!surface->locked) { + /* Perform the lock */ + if (surface->flags & SDL_RLEACCEL) { + SDL_UnRLESurface(surface, 1); + surface->flags |= SDL_RLEACCEL; /* save accel'd state */ + } + } + + /* Increment the surface lock count, for recursive locks */ + ++surface->locked; + + /* Ready to go.. */ + return (0); +} + +/* + * Unlock a previously locked surface + */ +void +SDL_UnlockSurface(SDL_Surface * surface) +{ + /* Only perform an unlock if we are locked */ + if (!surface->locked || (--surface->locked > 0)) { + return; + } + + /* Update RLE encoded surface with new data */ + if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { + surface->flags &= ~SDL_RLEACCEL; /* stop lying */ + SDL_RLESurface(surface); + } +} + +/* + * Creates a new surface identical to the existing surface + */ +SDL_Surface * +SDL_DuplicateSurface(SDL_Surface * surface) +{ + return SDL_ConvertSurface(surface, surface->format, surface->flags); +} + +/* + * Convert a surface into the specified pixel format. + */ +SDL_Surface * +SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format, + Uint32 flags) +{ + SDL_Surface *convert; + Uint32 copy_flags; + SDL_Color copy_color; + SDL_Rect bounds; + + if (!surface) { + SDL_InvalidParamError("surface"); + return NULL; + } + if (!format) { + SDL_InvalidParamError("format"); + return NULL; + } + + /* Check for empty destination palette! (results in empty image) */ + if (format->palette != NULL) { + int i; + for (i = 0; i < format->palette->ncolors; ++i) { + if ((format->palette->colors[i].r != 0xFF) || + (format->palette->colors[i].g != 0xFF) || + (format->palette->colors[i].b != 0xFF)) + break; + } + if (i == format->palette->ncolors) { + SDL_SetError("Empty destination palette"); + return (NULL); + } + } + + /* Create a new surface with the desired format */ + convert = SDL_CreateRGBSurface(flags, surface->w, surface->h, + format->BitsPerPixel, format->Rmask, + format->Gmask, format->Bmask, + format->Amask); + if (convert == NULL) { + return (NULL); + } + + /* Copy the palette if any */ + if (format->palette && convert->format->palette) { + SDL_memcpy(convert->format->palette->colors, + format->palette->colors, + format->palette->ncolors * sizeof(SDL_Color)); + convert->format->palette->ncolors = format->palette->ncolors; + } + + /* Save the original copy flags */ + copy_flags = surface->map->info.flags; + copy_color.r = surface->map->info.r; + copy_color.g = surface->map->info.g; + copy_color.b = surface->map->info.b; + copy_color.a = surface->map->info.a; + surface->map->info.r = 0xFF; + surface->map->info.g = 0xFF; + surface->map->info.b = 0xFF; + surface->map->info.a = 0xFF; + surface->map->info.flags = 0; + SDL_InvalidateMap(surface->map); + + /* Copy over the image data */ + bounds.x = 0; + bounds.y = 0; + bounds.w = surface->w; + bounds.h = surface->h; + SDL_LowerBlit(surface, &bounds, convert, &bounds); + + /* Clean up the original surface, and update converted surface */ + convert->map->info.r = copy_color.r; + convert->map->info.g = copy_color.g; + convert->map->info.b = copy_color.b; + convert->map->info.a = copy_color.a; + convert->map->info.flags = + (copy_flags & + ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND + | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY | + SDL_COPY_RLE_ALPHAKEY)); + surface->map->info.r = copy_color.r; + surface->map->info.g = copy_color.g; + surface->map->info.b = copy_color.b; + surface->map->info.a = copy_color.a; + surface->map->info.flags = copy_flags; + SDL_InvalidateMap(surface->map); + if (copy_flags & SDL_COPY_COLORKEY) { + SDL_bool set_colorkey_by_color = SDL_FALSE; + + if (surface->format->palette) { + if (format->palette && + surface->format->palette->ncolors <= format->palette->ncolors && + (SDL_memcmp(surface->format->palette->colors, format->palette->colors, + surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) { + /* The palette is identical, just set the same colorkey */ + SDL_SetColorKey(convert, 1, surface->map->info.colorkey); + } else if (format->Amask) { + /* The alpha was set in the destination from the palette */ + } else { + set_colorkey_by_color = SDL_TRUE; + } + } else { + set_colorkey_by_color = SDL_TRUE; + } + + if (set_colorkey_by_color) { + SDL_Surface *tmp; + SDL_Surface *tmp2; + int converted_colorkey = 0; + + /* Create a dummy surface to get the colorkey converted */ + tmp = SDL_CreateRGBSurface(0, 1, 1, + surface->format->BitsPerPixel, surface->format->Rmask, + surface->format->Gmask, surface->format->Bmask, + surface->format->Amask); + + /* Share the palette, if any */ + if (surface->format->palette) { + SDL_SetSurfacePalette(tmp, surface->format->palette); + } + + SDL_FillRect(tmp, NULL, surface->map->info.colorkey); + + tmp->map->info.flags &= ~SDL_COPY_COLORKEY; + + /* Convertion of the colorkey */ + tmp2 = SDL_ConvertSurface(tmp, format, 0); + + /* Get the converted colorkey */ + SDL_memcpy(&converted_colorkey, tmp2->pixels, tmp2->format->BytesPerPixel); + + SDL_FreeSurface(tmp); + SDL_FreeSurface(tmp2); + + /* Set the converted colorkey on the new surface */ + SDL_SetColorKey(convert, 1, converted_colorkey); + + /* This is needed when converting for 3D texture upload */ + SDL_ConvertColorkeyToAlpha(convert); + } + } + SDL_SetClipRect(convert, &surface->clip_rect); + + /* Enable alpha blending by default if the new surface has an + * alpha channel or alpha modulation */ + if ((surface->format->Amask && format->Amask) || + (copy_flags & SDL_COPY_MODULATE_ALPHA)) { + SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND); + } + if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) { + SDL_SetSurfaceRLE(convert, SDL_RLEACCEL); + } + + /* We're ready to go! */ + return (convert); +} + +SDL_Surface * +SDL_ConvertSurfaceFormat(SDL_Surface * surface, Uint32 pixel_format, + Uint32 flags) +{ + SDL_PixelFormat *fmt; + SDL_Surface *convert = NULL; + + fmt = SDL_AllocFormat(pixel_format); + if (fmt) { + convert = SDL_ConvertSurface(surface, fmt, flags); + SDL_FreeFormat(fmt); + } + return convert; +} + +/* + * Create a surface on the stack for quick blit operations + */ +static SDL_INLINE SDL_bool +SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format, + void * pixels, int pitch, SDL_Surface * surface, + SDL_PixelFormat * format, SDL_BlitMap * blitmap) +{ + if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) { + SDL_SetError("Indexed pixel formats not supported"); + return SDL_FALSE; + } + if (SDL_InitFormat(format, pixel_format) < 0) { + return SDL_FALSE; + } + + SDL_zerop(surface); + surface->flags = SDL_PREALLOC; + surface->format = format; + surface->pixels = pixels; + surface->w = width; + surface->h = height; + surface->pitch = pitch; + /* We don't actually need to set up the clip rect for our purposes */ + /* SDL_SetClipRect(surface, NULL); */ + + /* Allocate an empty mapping */ + SDL_zerop(blitmap); + blitmap->info.r = 0xFF; + blitmap->info.g = 0xFF; + blitmap->info.b = 0xFF; + blitmap->info.a = 0xFF; + surface->map = blitmap; + + /* The surface is ready to go */ + surface->refcount = 1; + return SDL_TRUE; +} + +/* + * Copy a block of pixels of one format to another format + */ +int SDL_ConvertPixels(int width, int height, + Uint32 src_format, const void * src, int src_pitch, + Uint32 dst_format, void * dst, int dst_pitch) +{ + SDL_Surface src_surface, dst_surface; + SDL_PixelFormat src_fmt, dst_fmt; + SDL_BlitMap src_blitmap, dst_blitmap; + SDL_Rect rect; + void *nonconst_src = (void *) src; + + /* Check to make sure we are blitting somewhere, so we don't crash */ + if (!dst) { + return SDL_InvalidParamError("dst"); + } + if (!dst_pitch) { + return SDL_InvalidParamError("dst_pitch"); + } + + if (SDL_ISPIXELFORMAT_FOURCC(src_format) && SDL_ISPIXELFORMAT_FOURCC(dst_format)) { + return SDL_ConvertPixels_YUV_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch); + } else if (SDL_ISPIXELFORMAT_FOURCC(src_format)) { + return SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch); + } else if (SDL_ISPIXELFORMAT_FOURCC(dst_format)) { + return SDL_ConvertPixels_RGB_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch); + } + + /* Fast path for same format copy */ + if (src_format == dst_format) { + int i; + const int bpp = SDL_BYTESPERPIXEL(src_format); + width *= bpp; + for (i = height; i--;) { + SDL_memcpy(dst, src, width); + src = (const Uint8*)src + src_pitch; + dst = (Uint8*)dst + dst_pitch; + } + return 0; + } + + if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src, + src_pitch, + &src_surface, &src_fmt, &src_blitmap)) { + return -1; + } + if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch, + &dst_surface, &dst_fmt, &dst_blitmap)) { + return -1; + } + + /* Set up the rect and go! */ + rect.x = 0; + rect.y = 0; + rect.w = width; + rect.h = height; + return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect); +} + +/* + * Free a surface created by the above function. + */ +void +SDL_FreeSurface(SDL_Surface * surface) +{ + if (surface == NULL) { + return; + } + if (surface->flags & SDL_DONTFREE) { + return; + } + SDL_InvalidateMap(surface->map); + + if (--surface->refcount > 0) { + return; + } + while (surface->locked > 0) { + SDL_UnlockSurface(surface); + } + if (surface->flags & SDL_RLEACCEL) { + SDL_UnRLESurface(surface, 0); + } + if (surface->format) { + SDL_SetSurfacePalette(surface, NULL); + SDL_FreeFormat(surface->format); + surface->format = NULL; + } + if (!(surface->flags & SDL_PREALLOC)) { + SDL_free(surface->pixels); + } + if (surface->map) { + SDL_FreeBlitMap(surface->map); + } + SDL_free(surface); +} + +/* vi: set ts=4 sw=4 expandtab: */ |