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Diffstat (limited to 'src/resources/sdlrescalefacility.cpp')
| -rw-r--r-- | src/resources/sdlrescalefacility.cpp | 486 |
1 files changed, 486 insertions, 0 deletions
diff --git a/src/resources/sdlrescalefacility.cpp b/src/resources/sdlrescalefacility.cpp new file mode 100644 index 00000000..cc478483 --- /dev/null +++ b/src/resources/sdlrescalefacility.cpp @@ -0,0 +1,486 @@ +/* + * The Mana World + * Copyright (C) 2004 The Mana World Development Team + * + * This file is part of The Mana World. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the Low GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Source code taken from: + * + * SDL_rotozoom - rotozoomer + * + * LGPL (c) A. Schiffler + * + */ + +#include "sdlrescalefacility.h" + +#define VALUE_LIMIT 0.001 + +typedef struct tColorRGBA { +Uint8 r; +Uint8 g; +Uint8 b; +Uint8 a; +} tColorRGBA; + +void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight) +{ + /* + * Sanity check zoom factors + */ + if (zoomx < VALUE_LIMIT) { + zoomx = VALUE_LIMIT; + } + if (zoomy < VALUE_LIMIT) { + zoomy = VALUE_LIMIT; + } + + /* + * Calculate target size + */ + *dstwidth = (int) ((double) width * zoomx); + *dstheight = (int) ((double) height * zoomy); + if (*dstwidth < 1) { + *dstwidth = 1; + } + if (*dstheight < 1) { + *dstheight = 1; + } +} + +int zoomSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int flipx, int flipy, int smooth) +{ + int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep, lx, ly; + tColorRGBA *c00, *c01, *c10, *c11, *cswap; + tColorRGBA *sp, *csp, *dp; + int dgap; + + /* + * Variable setup + */ + if (smooth) { + /* + * For interpolation: assume source dimension is one pixel + */ + /* + * smaller to avoid overflow on right and bottom edge. + */ + sx = (int) (65536.0 * (float) (src->w - 1) / (float) dst->w); + sy = (int) (65536.0 * (float) (src->h - 1) / (float) dst->h); + } else { + sx = (int) (65536.0 * (float) src->w / (float) dst->w); + sy = (int) (65536.0 * (float) src->h / (float) dst->h); + } + + /* + * Allocate memory for row increments + */ + if ((sax = (int *) malloc((dst->w + 1) * sizeof(Uint32))) == NULL) { + return (-1); + } + if ((say = (int *) malloc((dst->h + 1) * sizeof(Uint32))) == NULL) { + free(sax); + return (-1); + } + + /* + * Precalculate row increments + */ + sp = csp = (tColorRGBA *) src->pixels; + dp = (tColorRGBA *) dst->pixels; + + if (flipx) csp += (src->w-1); + if (flipy) csp += (src->pitch*(src->h-1)); + + csx = 0; + csax = sax; + for (x = 0; x <= dst->w; x++) { + *csax = csx; + csax++; + csx &= 0xffff; + csx += sx; + } + csy = 0; + csay = say; + for (y = 0; y <= dst->h; y++) { + *csay = csy; + csay++; + csy &= 0xffff; + csy += sy; + } + + dgap = dst->pitch - dst->w * 4; + + /* + * Switch between interpolating and non-interpolating code + */ + if (smooth) { + + /* + * Interpolating Zoom + */ + + /* + * Scan destination + */ + ly = 0; + csay = say; + for (y = 0; y < dst->h; y++) { + /* + * Setup color source pointers + */ + c00 = csp; + c01 = csp; + c01++; + c10 = (tColorRGBA *) ((Uint8 *) csp + src->pitch); + c11 = c10; + c11++; + csax = sax; + if (flipx) { + cswap = c00; c00=c01; c01=cswap; + cswap = c10; c10=c11; c11=cswap; + } + if (flipy) { + cswap = c00; c00=c10; c10=cswap; + cswap = c01; c01=c11; c11=cswap; + } + lx = 0; + for (x = 0; x < dst->w; x++) { + /* + * Interpolate colors + */ + ex = (*csax & 0xffff); + ey = (*csay & 0xffff); + t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff; + t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff; + dp->r = (((t2 - t1) * ey) >> 16) + t1; + t1 = ((((c01->g - c00->g) * ex) >> 16) + c00->g) & 0xff; + t2 = ((((c11->g - c10->g) * ex) >> 16) + c10->g) & 0xff; + dp->g = (((t2 - t1) * ey) >> 16) + t1; + t1 = ((((c01->b - c00->b) * ex) >> 16) + c00->b) & 0xff; + t2 = ((((c11->b - c10->b) * ex) >> 16) + c10->b) & 0xff; + dp->b = (((t2 - t1) * ey) >> 16) + t1; + t1 = ((((c01->a - c00->a) * ex) >> 16) + c00->a) & 0xff; + t2 = ((((c11->a - c10->a) * ex) >> 16) + c10->a) & 0xff; + dp->a = (((t2 - t1) * ey) >> 16) + t1; + + /* + * Advance source pointers + */ + csax++; + sstep = (*csax >> 16); + lx += sstep; + if (lx >= src->w) sstep = 0; + if (flipx) sstep = -sstep; + c00 += sstep; + c01 += sstep; + c10 += sstep; + c11 += sstep; + /* + * Advance destination pointer + */ + dp++; + } + /* + * Advance source pointer + */ + csay++; + sstep = (*csay >> 16); + ly += sstep; + if (ly >= src->h) sstep = 0; + sstep *= src->pitch; + if (flipy) sstep = -sstep; + csp = (tColorRGBA *) ((Uint8 *) csp + sstep); + + /* + * Advance destination pointers + */ + dp = (tColorRGBA *) ((Uint8 *) dp + dgap); + } + } else { + + /* + * Non-Interpolating Zoom + */ + + csay = say; + for (y = 0; y < dst->h; y++) { + sp = csp; + csax = sax; + for (x = 0; x < dst->w; x++) { + /* + * Draw + */ + *dp = *sp; + /* + * Advance source pointers + */ + csax++; + sstep = (*csax >> 16); + if (flipx) sstep = -sstep; + sp += sstep; + /* + * Advance destination pointer + */ + dp++; + } + /* + * Advance source pointer + */ + csay++; + sstep = (*csay >> 16) * src->pitch; + if (flipy) sstep = -sstep; + csp = (tColorRGBA *) ((Uint8 *) csp + sstep); + + /* + * Advance destination pointers + */ + dp = (tColorRGBA *) ((Uint8 *) dp + dgap); + } + } + + /* + * Remove temp arrays + */ + free(sax); + free(say); + + return (0); +} + + + +int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst, int flipx, int flipy) +{ + Uint32 x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, sstep; + Uint8 *sp, *dp, *csp; + int dgap; + + /* + * Variable setup + */ + sx = (Uint32) (65536.0 * (float) src->w / (float) dst->w); + sy = (Uint32) (65536.0 * (float) src->h / (float) dst->h); + + + /* + * Allocate memory for row increments + */ + if ((sax = (Uint32 *) malloc((dst->w + 1) * sizeof(Uint32))) == NULL) { + return (-1); + } + if ((say = (Uint32 *) malloc((dst->h + 1) * sizeof(Uint32))) == NULL) { + free(sax); + return (-1); + } + + /* + * Pointer setup + */ + sp = csp = (Uint8 *) src->pixels; + dp = (Uint8 *) dst->pixels; + dgap = dst->pitch - dst->w; + + if (flipx) csp += (src->w-1); + if (flipy) csp = ( (Uint8*)csp + src->pitch*(src->h-1) ); + + /* + * Precalculate row increments + */ + csx = 0; + csax = sax; + for (x = 0; x <= dst->w; x++) { + *csax = csx; + csax++; + csx &= 0xffff; + csx += sx; + } + csy = 0; + csay = say; + for (y = 0; y <= dst->h; y++) { + *csay = csy; + csay++; + csy &= 0xffff; + csy += sy; + } + + + /* + * Draw + */ + csay = say; + for (y = 0; y < dst->h; y++) { + csax = sax; + sp = csp; + for (x = 0; x < dst->w; x++) { + /* + * Draw + */ + *dp = *sp; + /* + * Advance source pointers + */ + csax++; + sstep = (*csax >> 16); + if (flipx) sstep = -sstep; + sp += sstep; + /* + * Advance destination pointer + */ + dp++; + } + /* + * Advance source pointer (for row) + */ + csay++; + sstep = (*csay >> 16) * src->pitch; + if (flipy) sstep = -sstep; + csp = ((Uint8 *) csp + sstep); + + /* + * Advance destination pointers + */ + dp += dgap; + } + + /* + * Remove temp arrays + */ + free(sax); + free(say); + + return (0); +} + + + +SDL_Surface *_SDLzoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth) +{ + SDL_Surface *rz_src; + SDL_Surface *rz_dst; + int dstwidth, dstheight; + int is32bit; + int i, src_converted; + int flipx, flipy; + + /* + * Sanity check + */ + if (src == NULL) + return (NULL); + + /* + * Determine if source surface is 32bit or 8bit + */ + is32bit = (src->format->BitsPerPixel == 32); + if ((is32bit) || (src->format->BitsPerPixel == 8)) { + /* + * Use source surface 'as is' + */ + rz_src = src; + src_converted = 0; + } else { + /* + * New source surface is 32bit with a defined RGBA ordering + */ + rz_src = + SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, +#if SDL_BYTEORDER == SDL_LIL_ENDIAN + 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000 +#else + 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff +#endif + ); + SDL_BlitSurface(src, NULL, rz_src, NULL); + src_converted = 1; + is32bit = 1; + } + + flipx = (zoomx<0.0); + if (flipx) zoomx = -zoomx; + flipy = (zoomy<0.0); + if (flipy) zoomy = -zoomy; + + /* Get size if target */ + zoomSurfaceSize(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight); + + /* + * Alloc space to completely contain the zoomed surface + */ + rz_dst = NULL; + if (is32bit) { + /* + * Target surface is 32bit with source RGBA/ABGR ordering + */ + rz_dst = + SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32, + rz_src->format->Rmask, rz_src->format->Gmask, + rz_src->format->Bmask, rz_src->format->Amask); + } else { + /* + * Target surface is 8bit + */ + rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0); + } + + /* + * Lock source surface + */ + SDL_LockSurface(rz_src); + /* + * Check which kind of surface we have + */ + if (is32bit) { + /* + * Call the 32bit transformation routine to do the zooming (using alpha) + */ + zoomSurfaceRGBA(rz_src, rz_dst, flipx, flipy, smooth); + /* + * Turn on source-alpha support + */ + SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255); + } else { + /* + * Copy palette and colorkey info + */ + for (i = 0; i < rz_src->format->palette->ncolors; i++) { + rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i]; + } + rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors; + /* + * Call the 8bit transformation routine to do the zooming + */ + zoomSurfaceY(rz_src, rz_dst, flipx, flipy); + SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey); + } + /* + * Unlock source surface + */ + SDL_UnlockSurface(rz_src); + + /* + * Cleanup temp surface + */ + if (src_converted) { + SDL_FreeSurface(rz_src); + } + + /* + * Return destination surface + */ + return (rz_dst); +} |