6700b4a603
* NEW: Put the Image.MakeTransparent() method in gb.image. * NEW: Compiles the image.c source file with full optimization. git-svn-id: svn://localhost/gambas/trunk@1804 867c0c6c-44f3-4631-809d-bfa615b0a4ec
578 lines
11 KiB
C
578 lines
11 KiB
C
/***************************************************************************
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image.c
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(c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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***************************************************************************/
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#define __IMAGE_C
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#include "image.h"
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static inline unsigned char *GET_END_POINTER(GB_IMG *image)
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{
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return &image->data[image->width * image->height * sizeof(int)];
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}
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static inline uint PREMUL(uint x)
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{
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uint a = x >> 24;
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uint t = (x & 0xff00ff) * a;
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t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8;
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t &= 0xff00ff;
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x = ((x >> 8) & 0xff) * a;
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x = (x + ((x >> 8) & 0xff) + 0x80);
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x &= 0xff00;
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x |= t | (a << 24);
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return x;
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}
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static inline uint INV_PREMUL(uint p)
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{
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return
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(ALPHA(p) == 0 ? 0 :
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((ALPHA(p) << 24)
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| (((255*RED(p))/ ALPHA(p)) << 16)
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| (((255*GREEN(p)) / ALPHA(p)) << 8)
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| ((255*BLUE(p)) / ALPHA(p))));
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}
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static inline uint SWAP(uint p)
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{
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return RGBA(ALPHA(p), BLUE(p), GREEN(p), RED(p));
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}
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static uint from_GB_COLOR(GB_COLOR col, int format)
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{
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col ^= 0xFF000000;
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if (GB_IMAGE_FMT_IS_PREMULTIPLIED(format))
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col = PREMUL(col);
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if (GB_IMAGE_FMT_IS_SWAPPED(format))
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col = SWAP(col);
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return col;
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}
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static GB_COLOR to_GB_COLOR(uint col, int format)
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{
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if (GB_IMAGE_FMT_IS_SWAPPED(format))
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col = SWAP(col);
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if (GB_IMAGE_FMT_IS_PREMULTIPLIED(format))
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col = INV_PREMUL(col);
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return col ^ 0xFF000000;
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}
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static inline uint BGRA_to_format(uint col, int format)
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{
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if (GB_IMAGE_FMT_IS_PREMULTIPLIED(format))
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col = PREMUL(col);
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if (GB_IMAGE_FMT_IS_SWAPPED(format))
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col = SWAP(col);
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return col;
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}
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static inline uint BGRA_from_format(uint col, int format)
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{
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if (GB_IMAGE_FMT_IS_SWAPPED(format))
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col = SWAP(col);
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if (GB_IMAGE_FMT_IS_PREMULTIPLIED(format))
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col = INV_PREMUL(col);
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return col;
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}
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static inline bool is_valid(GB_IMG *img, int x, int y)
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{
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return !(x >= img->width || y >= img->height || x < 0 || y < 0);
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}
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// Only converts to the following formats:
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// - GB_IMAGE_BGRA
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// - GB_IMAGE_BGRX
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// - GB_IMAGE_RGBA
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// - GB_IMAGE_RGBX
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static void convert_image(uchar *dst, int dst_format, uchar *src, int src_format, int w, int h)
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{
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unsigned char *s = src;
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unsigned char *d = dst;
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int len;
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unsigned char *dm;
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uint *p, *pm;
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bool psrc, pdst;
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len = w * h * sizeof(uint);
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dm = &d[len];
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psrc = GB_IMAGE_FMT_IS_PREMULTIPLIED(src_format);
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src_format = GB_IMAGE_FMT_CLEAR_PREMULTIPLIED(src_format);
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pdst = GB_IMAGE_FMT_IS_PREMULTIPLIED(dst_format);
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dst_format = GB_IMAGE_FMT_CLEAR_PREMULTIPLIED(dst_format);
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if (dst_format == GB_IMAGE_BGRA || dst_format == GB_IMAGE_BGRX)
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{
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switch (src_format)
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{
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case GB_IMAGE_BGRA: case GB_IMAGE_BGRX:
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goto __0123;
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case GB_IMAGE_ARGB: case GB_IMAGE_XRGB:
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goto __3210;
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case GB_IMAGE_RGBA: case GB_IMAGE_RGBX:
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goto __2103;
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case GB_IMAGE_ABGR: case GB_IMAGE_XBGR:
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goto __1230;
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case GB_IMAGE_BGR:
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goto __012X;
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case GB_IMAGE_RGB:
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goto __210X;
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}
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}
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else if (dst_format == GB_IMAGE_RGBA || dst_format == GB_IMAGE_RGBX)
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{
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switch (src_format)
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{
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case GB_IMAGE_RGBA: case GB_IMAGE_RGBX:
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goto __0123;
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case GB_IMAGE_ABGR: case GB_IMAGE_XBGR:
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goto __3210;
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case GB_IMAGE_BGRA: case GB_IMAGE_BGRX:
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goto __2103;
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case GB_IMAGE_ARGB: case GB_IMAGE_XRGB:
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goto __1230;
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case GB_IMAGE_RGB:
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goto __012X;
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case GB_IMAGE_BGR:
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goto __210X;
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}
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}
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__0123:
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memcpy(dst, src, len);
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goto __PREMULTIPLIED;
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__3210:
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while (d != dm)
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{
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d[0] = s[3];
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d[1] = s[2];
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d[2] = s[1];
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d[3] = s[0];
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s += 4;
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d += 4;
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}
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goto __PREMULTIPLIED;
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__2103:
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while (d != dm)
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{
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d[0] = s[2];
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d[1] = s[1];
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d[2] = s[0];
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d[3] = s[3];
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s += 4;
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d += 4;
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}
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goto __PREMULTIPLIED;
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__1230:
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while (d != dm)
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{
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d[0] = s[1];
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d[1] = s[2];
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d[2] = s[3];
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d[3] = s[0];
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s += 4;
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d += 4;
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}
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goto __PREMULTIPLIED;
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__012X:
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while (d != dm)
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{
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d[0] = s[0];
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d[1] = s[1];
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d[2] = s[2];
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d[3] = 0xFF;
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s += 3;
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d += 4;
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}
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return;
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__210X:
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while (d != dm)
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{
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d[0] = s[2];
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d[1] = s[1];
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d[2] = s[0];
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d[3] = 0xFF;
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s += 3;
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d += 4;
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}
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return;
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__PREMULTIPLIED:
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if (psrc == pdst)
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return;
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p = (uint *)dst;
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pm = (uint *)dm;
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if (psrc)
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{
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// convert premultiplied to normal
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while (p != pm)
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{
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*p = INV_PREMUL(*p);
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p++;
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}
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}
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else
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{
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// convert normal to premultiplied
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while (p != pm)
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{
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*p = PREMUL(*p);
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p++;
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}
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}
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}
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int IMAGE_size(GB_IMG *img)
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{
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return img->width * img->height * (GB_IMAGE_FMT_IS_24_BITS(img->format) ? 3 : 4);
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}
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void IMAGE_create(GB_IMG *img, int width, int height, int format)
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{
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if (width <= 0 || height <= 0)
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{
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GB_BASE save = img->ob;
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CLEAR(img);
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img->ob = save;
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return;
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}
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img->width = width;
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img->height = height;
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img->format = format;
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GB.Alloc(POINTER(&img->data), IMAGE_size(img));
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img->owner = NULL;
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}
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void IMAGE_create_with_data(GB_IMG *img, int width, int height, int format, unsigned char *data)
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{
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IMAGE_create(img, width, height, format);
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memcpy(img->data, data, IMAGE_size(img));
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}
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// Check if a temporary handle is needed, and return 1 if it is
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int IMAGE_check(GB_IMG *img, GB_IMG_OWNER *temp)
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{
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// If we already have the temporary handle, then do nothing
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if (img->temp == temp)
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return 0;
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// If somebody else has a temporary handle
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if (img->temp)
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{
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// release it only if it is not the owner
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if (img->temp != img->owner)
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(*img->temp->release)(img, img->temp_handle);
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img->temp_handle = 0;
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}
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// Get the temporary handle
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img->temp = temp;
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// If we are the owner, we must use our owner handle as temporary handle
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if (img->owner == temp)
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{
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img->temp_handle = img->owner_handle;
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return 0;
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}
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// If we are not the owner, then we will have to create the temporary handle ourself
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else
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{
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img->temp_handle = 0;
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return 1;
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}
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}
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// Take ownership of the image
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void IMAGE_take(GB_IMG *img, GB_IMG_OWNER *owner, void *owner_handle, int width, int height, unsigned char *data)
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{
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// If we are already the owner with the same handle, then do nothing
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if (img->owner == owner && img->owner_handle == owner_handle)
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return;
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// Release the old owner
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if (img->owner)
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(*img->owner->free)(img, img->owner_handle);
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else
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GB.Free(POINTER(&img->data));
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// If we have the temporary handle too, then clean it as it is necessarily the same
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if (img->temp == img->owner)
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{
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img->temp = NULL;
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img->temp_handle = 0;
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}
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// Become the owner
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img->owner = owner;
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img->owner_handle = owner_handle;
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// As we are now the owner, then we must have the temporary handle too
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IMAGE_check(img, NULL);
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img->temp = owner;
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img->temp_handle = owner_handle;
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// Initialize the data
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img->width = width;
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img->height = height;
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img->data = data;
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}
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void IMAGE_delete(GB_IMG *img)
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{
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IMAGE_take(img, NULL, NULL, 0, 0, NULL);
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img->format = 0;
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}
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void IMAGE_convert(GB_IMG *img, int format)
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{
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GB_IMG tmp;
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if (format == img->format)
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return;
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IMAGE_create(&tmp, img->width, img->height, format);
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convert_image(tmp.data, tmp.format, img->data, img->format, img->width, img->height);
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IMAGE_delete(img);
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img->data = tmp.data;
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img->format = format;
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}
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void IMAGE_fill(GB_IMG *img, GB_COLOR col)
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{
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uint *d = (uint *)img->data;
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uint *dm = (uint *)GET_END_POINTER(img);
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col = from_GB_COLOR(col, img->format);
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while (d != dm)
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*d++ = col;
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}
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// GB_IMAGE_RGB[APX] only
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void IMAGE_make_gray(GB_IMG *img)
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{
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uchar *b = img->data;
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uchar *g = b + 1;
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uchar *r = b + 2;
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uchar *end = GET_END_POINTER(img);
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while (b != end)
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{
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*b = *g = *r = (((*r + *b) >> 1) + *g) >> 1; // (r + b + g) / 3
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b += 4;
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g += 4;
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r += 4;
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}
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}
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GB_COLOR IMAGE_get_pixel(GB_IMG *img, int x, int y)
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{
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uint col;
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if (!is_valid(img, x, y))
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return (-1);
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col = ((uint *)img->data)[y * img->width + x];
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return to_GB_COLOR(col, img->format);
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}
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void IMAGE_set_pixel(GB_IMG *img, int x, int y, GB_COLOR col)
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{
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if (!is_valid(img, x, y))
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return;
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((uint *)img->data)[y * img->width + x] = from_GB_COLOR(col, img->format);
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}
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void IMAGE_replace(GB_IMG *img, GB_COLOR src, GB_COLOR dst, bool noteq)
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{
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uint *p;
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uint i, n;
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src = from_GB_COLOR(src, img->format);
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dst = from_GB_COLOR(dst, img->format);
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p = (uint *)img->data;
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n = img->width * img->height;
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if (noteq)
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{
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for (i = 0; i < n; i++, p++)
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{
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if (*p != src)
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*p = dst;
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}
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}
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else
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{
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for (i = 0; i < n; i++, p++)
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{
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if (*p == src)
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*p = dst;
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}
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}
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}
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// Comes from the GIMP
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typedef
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struct {
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float r;
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float b;
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float g;
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float a;
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}
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FLOAT_RGB;
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static void color_to_alpha(FLOAT_RGB *src, const FLOAT_RGB *color)
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{
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FLOAT_RGB alpha;
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alpha.a = src->a;
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if (color->r < 0.0001)
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alpha.r = src->r;
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else if (src->r > color->r)
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alpha.r = (src->r - color->r) / (1.0 - color->r);
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else if (src->r < color->r)
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alpha.r = (color->r - src->r) / color->r;
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else alpha.r = 0.0;
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if (color->g < 0.0001)
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alpha.g = src->g;
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else if (src->g > color->g)
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alpha.g = (src->g - color->g) / (1.0 - color->g);
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else if (src->g < color->g)
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alpha.g = (color->g - src->g) / (color->g);
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else alpha.g = 0.0;
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if (color->b < 0.0001)
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alpha.b = src->b;
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else if (src->b > color->b)
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alpha.b = (src->b - color->b) / (1.0 - color->b);
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else if (src->b < color->b)
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alpha.b = (color->b - src->b) / (color->b);
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else alpha.b = 0.0;
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if (alpha.r > alpha.g)
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{
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if (alpha.r > alpha.b)
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{
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src->a = alpha.r;
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}
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else
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{
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src->a = alpha.b;
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}
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}
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else if (alpha.g > alpha.b)
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{
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src->a = alpha.g;
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}
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else
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{
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src->a = alpha.b;
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}
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if (src->a < 0.0001)
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return;
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src->r = (src->r - color->r) / src->a + color->r;
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src->g = (src->g - color->g) / src->a + color->g;
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src->b = (src->b - color->b) / src->a + color->b;
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src->a *= alpha.a;
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}
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void IMAGE_make_transparent(GB_IMG *img, GB_COLOR col)
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{
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uint *p = (uint *)img->data;
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uint *pm = (uint *)(img->data + IMAGE_size(img));
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uint color;
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FLOAT_RGB rgb_color;
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FLOAT_RGB rgb_src;
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color = from_GB_COLOR(col, img->format);
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rgb_color.b = BLUE(color) / 255.0;
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rgb_color.g = GREEN(color) / 255.0;
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rgb_color.r = RED(color) / 255.0;
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rgb_color.a = 1.0;
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while (p != pm)
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{
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color = BGRA_from_format(*p, img->format);
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rgb_src.b = BLUE(color) / 255.0;
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rgb_src.g = GREEN(color) / 255.0;
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rgb_src.r = RED(color) / 255.0;
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rgb_src.a = ALPHA(color) / 255.0;
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color_to_alpha(&rgb_src, &rgb_color);
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color = RGBA(
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(unsigned char)(255.0 * rgb_src.r + 0.5),
|
|
(unsigned char)(255.0 * rgb_src.g + 0.5),
|
|
(unsigned char)(255.0 * rgb_src.b + 0.5),
|
|
(unsigned char)(255.0 * rgb_src.a + 0.5)
|
|
);
|
|
|
|
*p = BGRA_to_format(color, img->format);
|
|
p++;
|
|
}
|
|
}
|
|
|
|
|
|
|