/* GdkPixbuf library - convert X drawable information to RGB * * Copyright (C) 1999 Michael Zucchi * * Authors: Michael Zucchi * Cody Russell * Federico Mena-Quintero * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include #include "gdkcolor.h" #include "gdkimage.h" #include "gdkvisual.h" #include "gdkwindow.h" #include "gdkpixbuf.h" #include "gdkpixmap.h" #include "gdk-pixbuf-private.h" #include "gdkinternals.h" /* Some convenient names */ #if (G_BYTE_ORDER == G_LITTLE_ENDIAN) #define LITTLE #undef BIG #else #define BIG #undef LITTLE #endif #define d(x) #define SWAP16(d) GUINT16_SWAP_LE_BE(d) static guint32 mask_table[] = { 0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff, 0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff, 0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff, 0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff, 0xffffffff }; /* * convert bitmap data to pixbuf without alpha, * without using a colormap */ static void bitmap1 (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2) { int xx, yy; int bpl; register guint8 data; guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels; d (printf ("bitmap, no alpha\n")); bpl = image->bpl; for (yy = y1; yy < y2; yy++) { o = orow; for (xx = x1; xx < x2; xx ++) { /* top 29 bits of xx (xx >> 3) indicate the byte the bit is inside, * bottom 3 bits (xx & 7) indicate bit inside that byte, * we don't bother to canonicalize data to 1 or 0, just * leave the relevant bit in-place. */ data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ? (0x80 >> (xx & 7)) : (1 << (xx & 7))); if (data) { *o++ = 255; *o++ = 255; *o++ = 255; } else { *o++ = 0; *o++ = 0; *o++ = 0; } } srow += bpl; orow += rowstride; } } /* * convert bitmap data to pixbuf with alpha, * without using a colormap */ static void bitmap1a (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2) { int xx, yy; int bpl; register guint8 data; guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels; d (printf ("bitmap, with alpha\n")); bpl = image->bpl; for (yy = y1; yy < y2; yy++) { o = orow; for (xx = x1; xx < x2; xx ++) { /* see comment in bitmap1() */ data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ? (0x80 >> (xx & 7)) : (1 << (xx & 7))); if (data) { *o++ = 255; *o++ = 255; *o++ = 255; *o++ = 255; } else { *o++ = 0; *o++ = 0; *o++ = 0; *o++ = 0; } } srow += bpl; orow += rowstride; } } /* * convert 1 bits-pixel data * no alpha */ static void rgb1 (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint8 data; guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels; d (printf ("1 bits/pixel\n")); /* convert upto 8 pixels/time */ /* its probably not worth trying to make this run very fast, who uses * 1 bit displays anymore? */ bpl = image->bpl; for (yy = y1; yy < y2; yy++) { o = orow; for (xx = x1; xx < x2; xx ++) { /* see comment in bitmap1() */ data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ? (0x80 >> (xx & 7)) : (1 << (xx & 7))); *o++ = colormap->colors[data].red >> 8; *o++ = colormap->colors[data].green >> 8; *o++ = colormap->colors[data].blue >> 8; } srow += bpl; orow += rowstride; } } /* * convert 1 bits/pixel data * with alpha */ static void rgb1a (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint8 data; guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl, *orow = pixels; d (printf ("1 bits/pixel\n")); /* convert upto 8 pixels/time */ /* its probably not worth trying to make this run very fast, who uses * 1 bit displays anymore? */ bpl = image->bpl; for (yy = y1; yy < y2; yy++) { o = orow; for (xx = x1; xx < x2; xx ++) { /* see comment in bitmap1() */ data = srow[xx >> 3] & (image->byte_order == GDK_MSB_FIRST ? (0x80 >> (xx & 7)) : (1 << (xx & 7))); *o++ = colormap->colors[data].red >> 8; *o++ = colormap->colors[data].green >> 8; *o++ = colormap->colors[data].blue >> 8; *o++ = 255; } srow += bpl; orow += rowstride; } } /* * convert 8 bits/pixel data * no alpha */ static void rgb8 (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; guint32 mask; register guint32 data; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; register guint8 *s; register guint8 *o; bpl = image->bpl; d (printf ("8 bit, no alpha output\n")); mask = mask_table[image->depth]; for (yy = y1; yy < y2; yy++) { s = srow; o = orow; for (xx = x1; xx < x2; xx++) { data = *s++ & mask; *o++ = colormap->colors[data].red >> 8; *o++ = colormap->colors[data].green >> 8; *o++ = colormap->colors[data].blue >> 8; } srow += bpl; orow += rowstride; } } /* * convert 8 bits/pixel data * with alpha */ static void rgb8a (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; guint32 mask; register guint32 data; guint32 remap[256]; register guint8 *s; /* read 2 pixels at once */ register guint32 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; d (printf ("8 bit, with alpha output\n")); mask = mask_table[image->depth]; for (xx = x1; xx < colormap->size; xx++) { #ifdef LITTLE remap[xx] = 0xff000000 | (colormap->colors[xx].blue & 0xff00) << 8 | (colormap->colors[xx].green & 0xff00) | (colormap->colors[xx].red >> 8); #else remap[xx] = 0xff | (colormap->colors[xx].red & 0xff00) << 16 | (colormap->colors[xx].green & 0xff00) << 8 | (colormap->colors[xx].blue & 0xff00); #endif } for (yy = y1; yy < y2; yy++) { s = srow; o = (guint32 *) orow; for (xx = x1; xx < x2; xx ++) { data = *s++ & mask; *o++ = remap[data]; } srow += bpl; orow += rowstride; } } /* Bit shifting for 565 and 555 conversion routines * * RGB565 == rrrr rggg gggb bbbb, 16 bit native endian * RGB555 == xrrr rrgg gggb bbbb * ABGR8888: ARGB, 32-bit native endian * RGBA8888: RGBA, 32-bit native endian */ #define R8fromRGB565(d) ((((d) >> 8) & 0xf8) | (((d) >> 13) & 0x7)) #define B8fromRGB565(d) ((((d) >> 3) & 0xfc) | (((d) >> 9) & 0x3)) #define G8fromRGB565(d) ((((d) << 3) & 0xf8) | (((d) >> 2) & 0x7)) #define ABGR8888fromRGB565(d) ( ((d) & 0xf800) >> 8 | ((d) & 0xe000) >> 13 \ | ((d) & 0x07e0) << 5 | ((d) & 0x0600) >> 1 \ | ((d) & 0x001f) << 19 | ((d) & 0x001c) << 14 \ | 0xff000000) #define RGBA8888fromRGB565(d) ( ((d) & 0xf800) << 16 | ((d) & 0xe000) << 11 \ | ((d) & 0x07e0) << 13 | ((d) & 0x0600) << 7 \ | ((d) & 0x001f) << 11 | ((d) & 0x001c) << 6 \ | 0xff) #define R8fromRGB555(d) (((d) & 0x7c00) >> 7 | ((d) & 0x7000) >> 12) #define B8fromRGB555(d) (((d) & 0x03e0) >> 2 | ((d) & 0x0380) >> 7) #define G8fromRGB555(d) (((d) & 0x001f) << 3 | ((d) & 0x001c) >> 2) #define ABGR8888fromRGB555(d) ( ((d) & 0x7c00) >> 7 | ((d) & 0x7000) >> 12 \ | ((d) & 0x03e0) << 6 | ((d) & 0x0380) << 1 \ | ((d) & 0x001f) << 19 | ((d) & 0x001c) << 14 \ | 0xff000000) #define RGBA8888fromRGB555(d) ( ((d) & 0x7c00) << 17 | ((d) & 0x7000) << 12 \ | ((d) & 0x03e0) << 14 | ((d) & 0x0380) << 9 \ | ((d) & 0x001f) << 11 | ((d) & 0x001c) << 6 \ | 0xff) /* * convert 16 bits/pixel data * no alpha * data in lsb format */ static void rgb565lsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint8 *) orow; for (xx = x1; xx < x2; xx ++) { register guint32 data = *s++; #ifdef BIG data = SWAP16 (data); #endif *o++ = R8fromRGB565 (data); *o++ = G8fromRGB565 (data); *o++ = B8fromRGB565 (data); } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * no alpha * data in msb format */ static void rgb565msb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint8 *) orow; for (xx = x1; xx < x2; xx ++) { register guint32 data = *s++; #ifdef LITTLE data = SWAP16 (data); #endif *o++ = R8fromRGB565 (data); *o++ = G8fromRGB565 (data); *o++ = B8fromRGB565 (data); } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * with alpha * data in lsb format */ static void rgb565alsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint32 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint32 *) orow; for (xx = x1; xx < x2; xx ++) { register guint32 data = *s++; #ifdef LITTLE *o++ = ABGR8888fromRGB565 (data); #else data = SWAP16 (data); *o++ = RGBA8888fromRGB565 (data); #endif } srow += bpl; orow += rowstride; } } /* * convert 16 bits/pixel data * with alpha * data in msb format */ static void rgb565amsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint32 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint32 *) orow; for (xx = x1; xx < x2; xx ++) { register guint32 data = *s++; #ifdef LITTLE data = SWAP16 (data); *o++ = ABGR8888fromRGB565 (data); #else *o++ = RGBA8888fromRGB565 (data); #endif } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * no alpha * data in lsb format */ static void rgb555lsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint8 *) orow; for (xx = x1; xx < x2; xx ++) { register guint32 data = *s++; #ifdef BIG data = SWAP16 (data); #endif *o++ = R8fromRGB555 (data); *o++ = G8fromRGB555 (data); *o++ = B8fromRGB555 (data); } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * no alpha * data in msb format */ static void rgb555msb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint8 *) orow; for (xx = x1; xx < x2; xx ++) { register guint32 data = *s++; #ifdef LITTLE data = SWAP16 (data); #endif *o++ = R8fromRGB555 (data); *o++ = G8fromRGB555 (data); *o++ = B8fromRGB555 (data); } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * with alpha * data in lsb format */ static void rgb555alsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; /* read 1 pixels at once */ register guint32 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint32 *) orow; for (xx = x1; xx < x2; xx++) { register guint32 data = *s++; #ifdef LITTLE *o++ = ABGR8888fromRGB555 (data); #else data = SWAP16 (data); *o++ = RGBA8888fromRGB555 (data); #endif } srow += bpl; orow += rowstride; } } /* * convert 15 bits/pixel data * with alpha * data in msb format */ static void rgb555amsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; register guint16 *s; register guint32 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = (guint16 *) srow; o = (guint32 *) orow; for (xx = x1; xx < x2; xx++) { register guint32 data = *s++; #ifdef LITTLE data = SWAP16 (data); *o++ = ABGR8888fromRGB555 (data); #else *o++ = RGBA8888fromRGB555 (data); #endif } srow += bpl; orow += rowstride; } } static void rgb888alsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; guint8 *s; /* for byte order swapping */ guint8 *o; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; bpl = image->bpl; d (printf ("32 bits/pixel with alpha\n")); /* lsb data */ for (yy = y1; yy < y2; yy++) { s = srow; o = orow; for (xx = x1; xx < x2; xx++) { *o++ = s[2]; *o++ = s[1]; *o++ = s[0]; *o++ = 0xff; s += 4; } srow += bpl; orow += rowstride; } } static void rgb888lsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; guint8 *o, *s; bpl = image->bpl; d (printf ("32 bit, lsb, no alpha\n")); for (yy = y1; yy < y2; yy++) { s = srow; o = orow; for (xx = x1; xx < x2; xx++) { *o++ = s[2]; *o++ = s[1]; *o++ = s[0]; s += 4; } srow += bpl; orow += rowstride; } } static void rgb888amsb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; guint32 *o; guint32 *s; d (printf ("32 bit, msb, with alpha\n")); bpl = image->bpl; /* msb data */ for (yy = y1; yy < y2; yy++) { s = (guint32 *) srow; o = (guint32 *) orow; for (xx = x1; xx < x2; xx++) { #ifdef LITTLE *o++ = (*s++ >> 8) | 0xff000000; #else *o++ = (*s++ << 8) | 0xff; #endif } srow += bpl; orow += rowstride; } } static void rgb888msb (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *colormap) { int xx, yy; int bpl; guint8 *srow = (guint8*)image->mem + y1 * image->bpl + x1 * image->bpp, *orow = pixels; guint8 *s; guint8 *o; d (printf ("32 bit, msb, no alpha\n")); bpl = image->bpl; for (yy = y1; yy < y2; yy++) { s = srow; o = orow; for (xx = x1; xx < x2; xx++) { *o++ = s[1]; *o++ = s[2]; *o++ = s[3]; s += 4; } srow += bpl; orow += rowstride; } } /* * This should work correctly with any display/any endianness, but will probably * run quite slow */ static void convert_real_slow (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *cmap, gboolean alpha) { int xx, yy; int bpl; guint8 *orow = pixels; guint8 *o; guint32 pixel; GdkVisual *v; guint8 component; int i; bpl = image->bpl; v = gdk_colormap_get_visual(cmap); if (image->depth != v->depth) { g_warning ("%s: The depth of the source image (%d) doesn't " "match the depth of the colormap passed in (%d).", G_STRLOC, image->depth, v->depth); return; } d(printf("rgb mask/shift/prec = %x:%x:%x %d:%d:%d %d:%d:%d\n", v->red_mask, v->green_mask, v->blue_mask, v->red_shift, v->green_shift, v->blue_shift, v->red_prec, v->green_prec, v->blue_prec)); for (yy = y1; yy < y2; yy++) { o = orow; for (xx = x1; xx < x2; xx++) { pixel = gdk_image_get_pixel(image, xx, yy); switch (v->type) { /* I assume this is right for static & greyscale's too? */ case GDK_VISUAL_STATIC_GRAY: case GDK_VISUAL_GRAYSCALE: case GDK_VISUAL_STATIC_COLOR: case GDK_VISUAL_PSEUDO_COLOR: *o++ = cmap->colors[pixel].red >> 8; *o++ = cmap->colors[pixel].green >> 8; *o++ = cmap->colors[pixel].blue >> 8; break; case GDK_VISUAL_TRUE_COLOR: /* This is odd because it must sometimes shift left (otherwise * I'd just shift >> (*_shift - 8 + *_prec + <0-7>). This logic * should work for all bit sizes/shifts/etc. */ component = 0; for (i = 24; i < 32; i += v->red_prec) component |= ((pixel & v->red_mask) << (32 - v->red_shift - v->red_prec)) >> i; *o++ = component; component = 0; for (i = 24; i < 32; i += v->green_prec) component |= ((pixel & v->green_mask) << (32 - v->green_shift - v->green_prec)) >> i; *o++ = component; component = 0; for (i = 24; i < 32; i += v->blue_prec) component |= ((pixel & v->blue_mask) << (32 - v->blue_shift - v->blue_prec)) >> i; *o++ = component; break; case GDK_VISUAL_DIRECT_COLOR: *o++ = cmap->colors[((pixel & v->red_mask) << (32 - v->red_shift - v->red_prec)) >> 24].red >> 8; *o++ = cmap->colors[((pixel & v->green_mask) << (32 - v->green_shift - v->green_prec)) >> 24].green >> 8; *o++ = cmap->colors[((pixel & v->blue_mask) << (32 - v->blue_shift - v->blue_prec)) >> 24].blue >> 8; break; } if (alpha) *o++ = 0xff; } orow += rowstride; } } typedef void (* cfunc) (GdkImage *image, guchar *pixels, int rowstride, int x1, int y1, int x2, int y2, GdkColormap *cmap); static cfunc convert_map[] = { rgb1,rgb1,rgb1a,rgb1a, rgb8,rgb8,rgb8a,rgb8a, rgb555lsb,rgb555msb,rgb555alsb,rgb555amsb, rgb565lsb,rgb565msb,rgb565alsb,rgb565amsb, rgb888lsb,rgb888msb,rgb888alsb,rgb888amsb }; /* * perform actual conversion * * If we can, try and use the optimised code versions, but as a default * fallback, and always for direct colour, use the generic/slow but complete * conversion function. */ static void rgbconvert (GdkImage *image, guchar *pixels, int rowstride, gboolean alpha, int x, int y, int width, int height, GdkColormap *cmap) { int index; int bank; GdkVisual *v; g_assert ((x + width) <= image->width); g_assert ((y + height) <= image->height); if (cmap == NULL) { /* Only allowed for bitmaps */ g_return_if_fail (image->depth == 1); if (alpha) bitmap1a (image, pixels, rowstride, x, y, x + width, y + height); else bitmap1 (image, pixels, rowstride, x, y, x + width, y + height); return; } v = gdk_colormap_get_visual (cmap); if (image->depth != v->depth) { g_warning ("%s: The depth of the source image (%d) doesn't " "match the depth of the colormap passed in (%d).", G_STRLOC, image->depth, v->depth); return; } bank = 5; /* default fallback converter */ index = (image->byte_order == GDK_MSB_FIRST) | (alpha != 0) << 1; d(printf("masks = %x:%x:%x\n", v->red_mask, v->green_mask, v->blue_mask)); d(printf("image depth = %d, bits per pixel = %d\n", image->depth, image->bits_per_pixel)); switch (v->type) { /* I assume this is right for static & greyscale's too? */ case GDK_VISUAL_STATIC_GRAY: case GDK_VISUAL_GRAYSCALE: case GDK_VISUAL_STATIC_COLOR: case GDK_VISUAL_PSEUDO_COLOR: switch (image->bits_per_pixel) { case 1: bank = 0; break; case 8: if (image->depth == 8) bank = 1; break; } break; case GDK_VISUAL_TRUE_COLOR: switch (image->depth) { case 15: if (v->red_mask == 0x7c00 && v->green_mask == 0x3e0 && v->blue_mask == 0x1f && image->bits_per_pixel == 16) bank = 2; break; case 16: if (v->red_mask == 0xf800 && v->green_mask == 0x7e0 && v->blue_mask == 0x1f && image->bits_per_pixel == 16) bank = 3; break; case 24: case 32: if (v->red_mask == 0xff0000 && v->green_mask == 0xff00 && v->blue_mask == 0xff && image->bits_per_pixel == 32) bank = 4; break; } break; case GDK_VISUAL_DIRECT_COLOR: /* always use the slow version */ break; } d (g_print ("converting using conversion function in bank %d\n", bank)); if (bank == 5) { convert_real_slow (image, pixels, rowstride, x, y, x + width, y + height, cmap, alpha); } else { index |= bank << 2; d (g_print ("converting with index %d\n", index)); (* convert_map[index]) (image, pixels, rowstride, x, y, x + width, y + height, cmap); } } /* Exported functions */ /** * gdk_pixbuf_get_from_drawable: * @dest: Destination pixbuf, or %NULL if a new pixbuf should be created. * @src: Source drawable. * @cmap: A colormap if @src doesn't have one set. * @src_x: Source X coordinate within drawable. * @src_y: Source Y coordinate within drawable. * @dest_x: Destination X coordinate in pixbuf, or 0 if @dest is NULL. * @dest_y: Destination Y coordinate in pixbuf, or 0 if @dest is NULL. * @width: Width in pixels of region to get. * @height: Height in pixels of region to get. * * Transfers image data from a #GdkDrawable and converts it to an RGB(A) * representation inside a #GdkPixbuf. In other words, copies * image data from a server-side drawable to a client-side RGB(A) buffer. * This allows you to efficiently read individual pixels on the client side. * * If the drawable @src has no colormap (gdk_drawable_get_colormap() * returns %NULL), then a suitable colormap must be specified. * Typically a #GdkWindow or a pixmap created by passing a #GdkWindow * to gdk_pixmap_new() will already have a colormap associated with * it. If the drawable has a colormap, the @cmap argument will be * ignored. If the drawable is a bitmap (1 bit per pixel pixmap), * then a colormap is not required; pixels with a value of 1 are * assumed to be white, and pixels with a value of 0 are assumed to be * black. For taking screenshots, gdk_colormap_get_system() returns * the correct colormap to use. * * If the specified destination pixbuf @dest is %NULL, then this * function will create an RGB pixbuf with 8 bits per channel and no * alpha, with the same size specified by the @width and @height * arguments. In this case, the @dest_x and @dest_y arguments must be * specified as 0. If the specified destination pixbuf is not %NULL * and it contains alpha information, then the filled pixels will be * set to full opacity (alpha = 255). * * If the specified drawable is a pixmap, then the requested source * rectangle must be completely contained within the pixmap, otherwise * the function will return %NULL. For pixmaps only (not for windows) * passing -1 for width or height is allowed to mean the full width * or height of the pixmap. * * If the specified drawable is a window, and the window is off the * screen, then there is no image data in the obscured/offscreen * regions to be placed in the pixbuf. The contents of portions of the * pixbuf corresponding to the offscreen region are undefined. * * If the window you're obtaining data from is partially obscured by * other windows, then the contents of the pixbuf areas corresponding * to the obscured regions are undefined. * * If the target drawable is not mapped (typically because it's * iconified/minimized or not on the current workspace), then %NULL * will be returned. * * If memory can't be allocated for the return value, %NULL will be returned * instead. * * (In short, there are several ways this function can fail, and if it fails * it returns %NULL; so check the return value.) * * This function calls gdk_drawable_get_image() internally and * converts the resulting image to a #GdkPixbuf, so the * documentation for gdk_drawable_get_image() may also be relevant. * * Return value: The same pixbuf as @dest if it was non-%NULL, or a newly-created * pixbuf with a reference count of 1 if no destination pixbuf was specified, or %NULL on error **/ GdkPixbuf * gdk_pixbuf_get_from_drawable (GdkPixbuf *dest, GdkDrawable *src, GdkColormap *cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height) { int src_width, src_height; GdkImage *image; int depth; int x0, y0; /* General sanity checks */ g_return_val_if_fail (src != NULL, NULL); if (GDK_IS_WINDOW (src)) /* FIXME: this is not perfect, since is_viewable() only tests * recursively up the Gdk parent window tree, but stops at * foreign windows or Gdk toplevels. I.e. if a window manager * unmapped one of its own windows, this won't work. */ g_return_val_if_fail (gdk_window_is_viewable (src), NULL); if (!dest) g_return_val_if_fail (dest_x == 0 && dest_y == 0, NULL); else { g_return_val_if_fail (dest->colorspace == GDK_COLORSPACE_RGB, NULL); g_return_val_if_fail (dest->n_channels == 3 || dest->n_channels == 4, NULL); g_return_val_if_fail (dest->bits_per_sample == 8, NULL); } if (cmap == NULL) cmap = gdk_drawable_get_colormap (src); depth = gdk_drawable_get_depth (src); if (depth != 1 && cmap == NULL) { g_warning ("%s: Source drawable has no colormap; either pass " "in a colormap, or set the colormap on the drawable " "with gdk_drawable_set_colormap()", G_STRLOC); return NULL; } if (cmap != NULL && depth != cmap->visual->depth) { g_warning ("%s: Depth of the source drawable is %d where as " "the visual depth of the colormap passed is %d", G_STRLOC, depth, cmap->visual->depth); return NULL; } /* Coordinate sanity checks */ if (GDK_IS_PIXMAP (src)) { gdk_drawable_get_size (src, &src_width, &src_height); if (width < 0) width = src_width; if (height < 0) height = src_height; g_return_val_if_fail (src_x >= 0 && src_y >= 0, NULL); g_return_val_if_fail (src_x + width <= src_width && src_y + height <= src_height, NULL); } /* Create the pixbuf if needed */ if (!dest) { dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height); if (dest == NULL) return NULL; } if (dest) { g_return_val_if_fail (dest_x >= 0 && dest_y >= 0, NULL); g_return_val_if_fail (dest_x + width <= dest->width, NULL); g_return_val_if_fail (dest_y + height <= dest->height, NULL); } for (y0 = 0; y0 < height; y0 += GDK_SCRATCH_IMAGE_HEIGHT) { gint height1 = MIN (height - y0, GDK_SCRATCH_IMAGE_HEIGHT); for (x0 = 0; x0 < width; x0 += GDK_SCRATCH_IMAGE_WIDTH) { gint xs0, ys0; gint width1 = MIN (width - x0, GDK_SCRATCH_IMAGE_WIDTH); image = _gdk_image_get_scratch (gdk_drawable_get_screen (src), width1, height1, depth, &xs0, &ys0); _gdk_drawable_copy_to_image (src, image, src_x + x0, src_y + y0, xs0, ys0, width1, height1); gdk_pixbuf_get_from_image (dest, image, cmap, xs0, ys0, dest_x + x0, dest_y + y0, width1, height1); } } return dest; } /** * gdk_pixbuf_get_from_image: * @dest: Destination pixbuf, or %NULL if a new pixbuf should be created. * @src: Source #GdkImage. * @cmap: A colormap, or %NULL to use the one for @src * @src_x: Source X coordinate within drawable. * @src_y: Source Y coordinate within drawable. * @dest_x: Destination X coordinate in pixbuf, or 0 if @dest is NULL. * @dest_y: Destination Y coordinate in pixbuf, or 0 if @dest is NULL. * @width: Width in pixels of region to get. * @height: Height in pixels of region to get. * * Same as gdk_pixbuf_get_from_drawable() but gets the pixbuf from * an image. * * Return value: @dest, newly-created pixbuf if @dest was %NULL, %NULL on error **/ GdkPixbuf* gdk_pixbuf_get_from_image (GdkPixbuf *dest, GdkImage *src, GdkColormap *cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height) { int rowstride, bpp, alpha; /* General sanity checks */ g_return_val_if_fail (GDK_IS_IMAGE (src), NULL); if (!dest) g_return_val_if_fail (dest_x == 0 && dest_y == 0, NULL); else { g_return_val_if_fail (dest->colorspace == GDK_COLORSPACE_RGB, NULL); g_return_val_if_fail (dest->n_channels == 3 || dest->n_channels == 4, NULL); g_return_val_if_fail (dest->bits_per_sample == 8, NULL); } if (cmap == NULL) cmap = gdk_image_get_colormap (src); if (src->depth != 1 && cmap == NULL) { g_warning ("%s: Source image has no colormap; either pass " "in a colormap, or set the colormap on the image " "with gdk_image_set_colormap()", G_STRLOC); return NULL; } if (cmap != NULL && src->depth != cmap->visual->depth) { g_warning ("%s: Depth of the Source image is %d where as " "the visual depth of the colormap passed is %d", G_STRLOC, src->depth, cmap->visual->depth); return NULL; } /* Coordinate sanity checks */ g_return_val_if_fail (src_x >= 0 && src_y >= 0, NULL); g_return_val_if_fail (src_x + width <= src->width && src_y + height <= src->height, NULL); if (dest) { g_return_val_if_fail (dest_x >= 0 && dest_y >= 0, NULL); g_return_val_if_fail (dest_x + width <= dest->width, NULL); g_return_val_if_fail (dest_y + height <= dest->height, NULL); } /* Create the pixbuf if needed */ if (!dest) { dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height); if (dest == NULL) return NULL; } alpha = dest->has_alpha; rowstride = dest->rowstride; bpp = alpha ? 4 : 3; /* we offset into the image data based on the position we are * retrieving from */ rgbconvert (src, dest->pixels + (dest_y * rowstride) + (dest_x * bpp), rowstride, alpha, src_x, src_y, width, height, cmap); return dest; }