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Change all conversion from 16-bit formats to 32-bit formats to re-use

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the high bits of the color values so that white maps to full white.
This commit is contained in:
Darin Adler 2000-05-09 18:23:29 +00:00
parent 2aff269cbd
commit 0e164d5fca
2 changed files with 126 additions and 67 deletions
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8
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,11 @@
2000-05-09 Darin Adler <darin@eazel.com>
* gdk-pixbuf/gdk-pixbuf-drawable.c: (rgb565lsb), (rgb565msb),
(rgb565alsb), (rgb565amsb), (rgb555lsb), (rgb555msb), (rgb555alsb),
(rgb555amsb), (convert_real_slow): Change all conversion from 16-bit
formats to 32-bit formats to re-use the high bits of the color values
so that white maps to full white.
Fri May 5 12:16:32 2000 Owen Taylor <otaylor@redhat.com>
* gdk-pixbuf/pixops/DETAILS: Add beginnings of file with

185
gdk/gdkpixbuf-drawable.c
View File

@ -257,23 +257,29 @@ rgb565lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
#ifdef LITTLE
s = (guint32 *) srow;
#else
s = (guint32 *) srow;
s = srow;
#endif
o = (guint16 *) orow;
for (xx = 1; xx < width; xx += 2) {
register guint32 data;
#ifdef LITTLE
data = *s++;
*o++ = (data & 0xf800) >> 8 | (data & 0x7e0) << 5;
*o++ = (data & 0x1f) << 3 | (data & 0xf8000000) >> 16;
*o++ = ((data & 0x7e00000) >> 19) | (data & 0x1f0000) >> 5;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21;
*o++ = (data & 0x7e00000) >> 19 | (data & 0x6000000) >> 25
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
/* swap endianness first */
data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24;
s += 4;
*o++ = (data & 0xf800) | (data & 0x7e0) >> 3;
*o++ = (data & 0x1f) << 11 | (data & 0xf8000000) >> 24;
*o++ = ((data & 0x7e00000) >> 11) | (data & 0x1f0000) >> 13;
*o++ = (data & 0xf800) | (data & 0xe000) >> 5
| (data & 0x7e0) >> 3 | (data & 0x600) >> 9;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0xf8000000) >> 24 | (data & 0xe0000000) >> 29;
*o++ = (data & 0x7e00000) >> 11 | (data & 0x6000000) >> 17
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
@ -285,9 +291,9 @@ rgb565lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
data = *((short *) s);
data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
#endif
((char *) o)[0] = (data >> 8) & 0xf8;
((char *) o)[1] = (data >> 3) & 0xfc;
((char *) o)[2] = (data << 3) & 0xf8;
((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7);
((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3);
((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7);
}
srow += bpl;
orow += rowstride;
@ -331,14 +337,20 @@ rgb565msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
/* swap endianness first */
data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24;
s += 4;
*o++ = (data & 0xf800) >> 8 | (data & 0x7e0) << 5;
*o++ = (data & 0x1f) << 3 | (data & 0xf8000000) >> 16;
*o++ = ((data & 0x7e00000) >> 19) | (data & 0x1f0000) >> 5;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0xf8000000) >> 16 | (data & 0xe0000000) >> 21;
*o++ = (data & 0x7e00000) >> 19 | (data & 0x6000000) >> 25
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
data = *s++;
*o++ = (data & 0xf800) | (data & 0x7e0) >> 3;
*o++ = (data & 0x1f) << 11 | (data & 0xf8000000) >> 24;
*o++ = ((data & 0x7e00000) >> 11) | (data & 0x1f0000) >> 13;
*o++ = (data & 0xf800) | (data & 0xe000) >> 5
| (data & 0x7e0) >> 3 | (data & 0x600) >> 9;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0xf8000000) >> 24 | (data & 0xe0000000) >> 29;
*o++ = (data & 0x7e00000) >> 11 | (data & 0x6000000) >> 17
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
@ -350,9 +362,9 @@ rgb565msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
#else
data = *((short *) s);
#endif
((char *) o)[0] = (data >> 8) & 0xf8;
((char *) o)[1] = (data >> 3) & 0xfc;
((char *) o)[2] = (data << 3) & 0xf8;
((char *) o)[0] = ((data >> 8) & 0xf8) | ((data >> 13) & 0x7);
((char *) o)[1] = ((data >> 3) & 0xfc) | ((data >> 9) & 0x3);
((char *) o)[2] = ((data << 3) & 0xf8) | ((data >> 2) & 0x7);
}
srow += bpl;
orow += rowstride;
@ -393,18 +405,22 @@ rgb565alsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colorma
o = (guint32 *) orow;
for (xx = 0; xx < width; xx ++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrr000 gggggg00 bbbbb000 aaaaaaaa */
/* little endian: aaaaaaaa bbbbb000 gggggg00 rrrrr000 */
/* rrrrrggg gggbbbbb -> rrrrrRRR ggggggGG bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB ggggggGG rrrrrRRR */
#ifdef LITTLE
data = *s++;
*o++ = (data & 0xf800) >> 8 | (data & 0x7e0) << 5
| (data & 0x1f) << 19 | 0xff000000;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0xf800) << 16 | (data & 0x7e0) << 13
| (data & 0x1f) << 11 | 0xff;
*o++ = (data & 0xf800) << 16 | (data & 0xe000) << 11
| (data & 0x7e0) << 13 | (data & 0x600) << 7
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
@ -442,18 +458,22 @@ rgb565amsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colorma
o = (guint32 *) orow;
for (xx = 0; xx < width; xx ++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrr000 gggggg00 bbbbb000 aaaaaaaa */
/* little endian: aaaaaaaa bbbbb000 gggggg00 rrrrr000 */
/* rrrrrggg gggbbbbb -> rrrrrRRR gggggg00 bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB gggggg00 rrrrrRRR */
#ifdef LITTLE
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0xf800) >> 8 | (data & 0x7e0) << 5
| (data & 0x1f) << 19 | 0xff000000;
*o++ = (data & 0xf800) >> 8 | (data & 0xe000) >> 13
| (data & 0x7e0) << 5 | (data & 0x600) >> 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
data = *s++;
*o++ = (data & 0xf800) << 16 | (data & 0x7e0) << 13
| (data & 0x1f) << 11 | 0xff;
*o++ = (data & 0xf800) << 16 | (data & 0xe000) << 11
| (data & 0x7e0) << 13 | (data & 0x600) << 7
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
@ -496,16 +516,22 @@ rgb555lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
register guint32 data;
#ifdef LITTLE
data = *s++;
*o++ = (data & 0x7c00) >> 7 | (data & 0x3e0) << 6;
*o++ = (data & 0x1f) << 3 | (data & 0x7c000000) >> 15;
*o++ = ((data & 0x3e00000) >> 18) | (data & 0x1f0000) >> 5;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0x7c000000) >> 15 | (data & 0x70000000) >> 20;
*o++ = (data & 0x3e00000) >> 18 | (data & 0x3800000) >> 23
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
/* swap endianness first */
data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24;
s += 4;
*o++ = (data & 0x7c00) << 1 | (data & 0x3e0) >> 2;
*o++ = (data & 0x1f) << 11 | (data & 0x7c000000) >> 23;
*o++ = ((data & 0x3e00000) >> 10) | (data & 0x1f0000) >> 13;
*o++ = (data & 0x7c00) << 1 | (data & 0x7000) >> 4
| (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0x7c000000) >> 23 | (data & 0x70000000) >> 28;
*o++ = (data & 0x3e00000) >> 10 | (data & 0x3800000) >> 15
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
@ -517,9 +543,9 @@ rgb555lsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
data = *((short *) s);
data = ((data >> 8) & 0xff) | ((data & 0xff) << 8);
#endif
((char *) o)[0] = (data & 0x7c0) >> 7;
((char *) o)[1] = (data & 0x3e0) >> 2;
((char *) o)[2] = (data & 0x1f) << 3;
((char *) o)[0] = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12;
((char *) o)[1] = (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
((char *) o)[2] = (data & 0x1f) << 3 | (data & 0x1c) >> 2;
}
srow += bpl;
orow += rowstride;
@ -559,14 +585,20 @@ rgb555msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
/* swap endianness first */
data = s[0] | s[1] << 8 | s[2] << 16 | s[3] << 24;
s += 4;
*o++ = (data & 0x7c00) >> 7 | (data & 0x3e0) << 6;
*o++ = (data & 0x1f) << 3 | (data & 0x7c000000) >> 15;
*o++ = ((data & 0x3e00000) >> 18) | (data & 0x1f0000) >> 5;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1;
*o++ = (data & 0x1f) << 3 | (data & 0x1c) >> 2
| (data & 0x7c000000) >> 15 | (data & 0x70000000) >> 20;
*o++ = (data & 0x3e00000) >> 18 | (data & 0x3800000) >> 23
| (data & 0x1f0000) >> 5 | (data & 0x1c0000) >> 10;
#else
data = *s++;
*o++ = (data & 0x7c00) << 1 | (data & 0x3e0) >> 2;
*o++ = (data & 0x1f) << 11 | (data & 0x7c000000) >> 23;
*o++ = ((data & 0x3e00000) >> 10) | (data & 0x1f0000) >> 13;
*o++ = (data & 0x7c00) << 1 | (data & 0x7000) >> 4
| (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
*o++ = (data & 0x1f) << 11 | (data & 0x1c) << 6
| (data & 0x7c000000) >> 23 | (data & 0x70000000) >> 28;
*o++ = (data & 0x3e00000) >> 10 | (data & 0x3800000) >> 15
| (data & 0x1f0000) >> 13 | (data & 0x1c0000) >> 18;
#endif
}
/* check for last remaining pixel */
@ -578,9 +610,9 @@ rgb555msb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colormap
#else
data = *((short *) s);
#endif
((char *) o)[0] = (data & 0x7c0) >> 7;
((char *) o)[1] = (data & 0x3e0) >> 2;
((char *) o)[2] = (data & 0x1f) << 3;
((char *) o)[0] = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12;
((char *) o)[1] = (data & 0x3e0) >> 2 | (data & 0x380) >> 7;
((char *) o)[2] = (data & 0x1f) << 3 | (data & 0x1c) >> 2;
}
srow += bpl;
orow += rowstride;
@ -621,18 +653,22 @@ rgb555alsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colorma
o = (guint32 *) orow;
for (xx = 0; xx < width; xx++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrr000 gggggg00 bbbbb000 aaaaaaaa */
/* little endian: aaaaaaaa bbbbb000 gggggg00 rrrrr000 */
/* rrrrrggg gggbbbbb -> rrrrrRRR gggggGGG bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB gggggGGG rrrrrRRR */
#ifdef LITTLE
data = *s++;
*o++ = (data & 0x7c00) >> 7 | (data & 0x3e0) << 6
| (data & 0x1f) << 19 | 0xff000000;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0x7c00) << 17 | (data & 0x3e0) << 14
| (data & 0x1f) << 11 | 0xff;
*o++ = (data & 0x7c00) << 17 | (data & 0x7000) << 12
| (data & 0x3e0) << 14 | (data & 0x380) << 9
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
@ -674,18 +710,22 @@ rgb555amsb (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *colorma
o = (guint32 *) orow;
for (xx = 0; xx < width; xx++) {
register guint32 data;
/* rrrrrggg gggbbbbb -> rrrrr000 gggggg00 bbbbb000 aaaaaaaa */
/* little endian: aaaaaaaa bbbbb000 gggggg00 rrrrr000 */
/* rrrrrggg gggbbbbb -> rrrrrRRR gggggGGG bbbbbBBB aaaaaaaa */
/* little endian: aaaaaaaa bbbbbBBB gggggGGG rrrrrRRR */
#ifdef LITTLE
/* swap endianness first */
data = s[0] | s[1] << 8;
s += 2;
*o++ = (data & 0x7c00) >>7 | (data & 0x3e0) << 6
| (data & 0x1f) << 19 | 0xff000000;
*o++ = (data & 0x7c00) >> 7 | (data & 0x7000) >> 12
| (data & 0x3e0) << 6 | (data & 0x380) << 1
| (data & 0x1f) << 19 | (data & 0x1c) << 14
| 0xff000000;
#else
data = *s++;
*o++ = (data & 0x7c00) << 17 | (data & 0x3e0) << 14
| (data & 0x1f) << 11 | 0xff;
*o++ = (data & 0x7c00) << 17 | (data & 0x7000) << 12
| (data & 0x3e0) << 14 | (data & 0x380) << 9
| (data & 0x1f) << 11 | (data & 0x1c) << 6
| 0xff;
#endif
}
srow += bpl;
@ -851,6 +891,8 @@ convert_real_slow (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *
guint8 *o;
guint32 pixel;
GdkVisual *v;
guint8 component;
int i;
width = image->width;
height = image->height;
@ -878,12 +920,21 @@ convert_real_slow (GdkImage *image, guchar *pixels, int rowstride, GdkColormap *
*o++ = cmap->colors[pixel].blue;
break;
case GDK_VISUAL_TRUE_COLOR:
/* this is odd because it must sometimes shift left (otherwise
i'd just shift >> *_shift - 8 + *_prec), so this logic
should work for all bit sizes/shifts/etc */
*o++ = ((pixel & v->red_mask) << (32 - v->red_shift - v->red_prec)) >> 24;
*o++ = ((pixel & v->green_mask) << (32 - v->green_shift - v->green_prec)) >> 24;
*o++ = ((pixel & v->blue_mask) << (32 - v->blue_shift - v->blue_prec)) >> 24;
/* 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;