mirror of
https://github.com/brl/mutter.git
synced 2024-11-25 17:40:40 -05:00
b9a9bf60b7
The pixel format of the bitmap needs to have its premult flag cleared or set after the premult conversion otherwise it may get converted again.
431 lines
9.6 KiB
C
431 lines
9.6 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2007,2008,2009 Intel Corporation.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "cogl.h"
|
|
#include "cogl-internal.h"
|
|
#include "cogl-bitmap-private.h"
|
|
|
|
#include <string.h>
|
|
|
|
/* TO rgba */
|
|
|
|
inline static void
|
|
_cogl_g_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[0];
|
|
dst[1] = src[0];
|
|
dst[2] = src[0];
|
|
dst[3] = 255;
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgb_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[0];
|
|
dst[1] = src[1];
|
|
dst[2] = src[2];
|
|
dst[3] = 255;
|
|
}
|
|
|
|
inline static void
|
|
_cogl_bgr_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[2];
|
|
dst[1] = src[1];
|
|
dst[2] = src[0];
|
|
dst[3] = 255;
|
|
}
|
|
|
|
inline static void
|
|
_cogl_bgra_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[2];
|
|
dst[1] = src[1];
|
|
dst[2] = src[0];
|
|
dst[3] = src[3];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_argb_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[1];
|
|
dst[1] = src[2];
|
|
dst[2] = src[3];
|
|
dst[3] = src[0];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_abgr_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[3];
|
|
dst[1] = src[2];
|
|
dst[2] = src[1];
|
|
dst[3] = src[0];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgba_to_rgba (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[0];
|
|
dst[1] = src[1];
|
|
dst[2] = src[2];
|
|
dst[3] = src[3];
|
|
}
|
|
|
|
/* FROM rgba */
|
|
|
|
inline static void
|
|
_cogl_rgba_to_g (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = (src[0] + src[1] + src[2]) / 3;
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgba_to_rgb (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[0];
|
|
dst[1] = src[1];
|
|
dst[2] = src[2];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgba_to_bgr (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[2];
|
|
dst[1] = src[1];
|
|
dst[2] = src[0];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgba_to_bgra (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[2];
|
|
dst[1] = src[1];
|
|
dst[2] = src[0];
|
|
dst[3] = src[3];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgba_to_argb (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[3];
|
|
dst[1] = src[0];
|
|
dst[2] = src[1];
|
|
dst[3] = src[2];
|
|
}
|
|
|
|
inline static void
|
|
_cogl_rgba_to_abgr (const guchar *src, guchar *dst)
|
|
{
|
|
dst[0] = src[3];
|
|
dst[1] = src[2];
|
|
dst[2] = src[1];
|
|
dst[3] = src[0];
|
|
}
|
|
|
|
/* (Un)Premultiplication */
|
|
|
|
inline static void
|
|
_cogl_unpremult_alpha_0 (guchar *dst)
|
|
{
|
|
dst[0] = 0;
|
|
dst[1] = 0;
|
|
dst[2] = 0;
|
|
dst[3] = 0;
|
|
}
|
|
|
|
inline static void
|
|
_cogl_unpremult_alpha_last (guchar *dst)
|
|
{
|
|
guchar alpha = dst[3];
|
|
|
|
dst[0] = (dst[0] * 255) / alpha;
|
|
dst[1] = (dst[1] * 255) / alpha;
|
|
dst[2] = (dst[2] * 255) / alpha;
|
|
}
|
|
|
|
inline static void
|
|
_cogl_unpremult_alpha_first (guchar *dst)
|
|
{
|
|
guchar alpha = dst[0];
|
|
|
|
dst[1] = (dst[1] * 255) / alpha;
|
|
dst[2] = (dst[2] * 255) / alpha;
|
|
dst[3] = (dst[3] * 255) / alpha;
|
|
}
|
|
|
|
/* No division form of floor((c*a + 128)/255) (I first encountered
|
|
* this in the RENDER implementation in the X server.) Being exact
|
|
* is important for a == 255 - we want to get exactly c.
|
|
*/
|
|
#define MULT(d,a,t) \
|
|
G_STMT_START { \
|
|
t = d * a + 128; \
|
|
d = ((t >> 8) + t) >> 8; \
|
|
} G_STMT_END
|
|
|
|
inline static void
|
|
_cogl_premult_alpha_last (guchar *dst)
|
|
{
|
|
guchar alpha = dst[3];
|
|
/* Using a separate temporary per component has given slightly better
|
|
* code generation with GCC in the past; it shouldn't do any worse in
|
|
* any case.
|
|
*/
|
|
guint t1, t2, t3;
|
|
MULT(dst[0], alpha, t1);
|
|
MULT(dst[1], alpha, t2);
|
|
MULT(dst[2], alpha, t3);
|
|
}
|
|
|
|
inline static void
|
|
_cogl_premult_alpha_first (guchar *dst)
|
|
{
|
|
guchar alpha = dst[0];
|
|
guint t1, t2, t3;
|
|
|
|
MULT(dst[1], alpha, t1);
|
|
MULT(dst[2], alpha, t2);
|
|
MULT(dst[3], alpha, t3);
|
|
}
|
|
|
|
#undef MULT
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_can_convert (CoglPixelFormat src, CoglPixelFormat dst)
|
|
{
|
|
if (src == dst)
|
|
return FALSE;
|
|
|
|
switch (src & COGL_UNORDERED_MASK)
|
|
{
|
|
case COGL_PIXEL_FORMAT_G_8:
|
|
case COGL_PIXEL_FORMAT_24:
|
|
case COGL_PIXEL_FORMAT_32:
|
|
|
|
if ((dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_24 &&
|
|
(dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_32 &&
|
|
(dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_G_8)
|
|
return FALSE;
|
|
break;
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_can_unpremult (CoglPixelFormat format)
|
|
{
|
|
return ((format & COGL_UNORDERED_MASK) == COGL_PIXEL_FORMAT_32);
|
|
}
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_can_premult (CoglPixelFormat format)
|
|
{
|
|
return ((format & COGL_UNORDERED_MASK) == COGL_PIXEL_FORMAT_32);
|
|
}
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_convert (const CoglBitmap *bmp,
|
|
CoglBitmap *dst_bmp,
|
|
CoglPixelFormat dst_format)
|
|
{
|
|
guchar *src;
|
|
guchar *dst;
|
|
gint src_bpp;
|
|
gint dst_bpp;
|
|
gint x,y;
|
|
guchar temp_rgba[4] = {0,0,0,0};
|
|
|
|
/* Make sure conversion supported */
|
|
if (!_cogl_bitmap_fallback_can_convert (bmp->format, dst_format))
|
|
return FALSE;
|
|
|
|
src_bpp = _cogl_get_format_bpp (bmp->format);
|
|
dst_bpp = _cogl_get_format_bpp (dst_format);
|
|
|
|
/* Initialize destination bitmap */
|
|
*dst_bmp = *bmp;
|
|
dst_bmp->rowstride = sizeof(guchar) * dst_bpp * dst_bmp->width;
|
|
dst_bmp->format = ((bmp->format & COGL_PREMULT_BIT) |
|
|
(dst_format & COGL_UNPREMULT_MASK));
|
|
|
|
/* Allocate a new buffer to hold converted data */
|
|
dst_bmp->data = g_malloc (sizeof(guchar)
|
|
* dst_bmp->height
|
|
* dst_bmp->rowstride);
|
|
|
|
/* FIXME: Optimize */
|
|
for (y = 0; y < bmp->height; y++)
|
|
{
|
|
src = (guchar*)bmp->data + y * bmp->rowstride;
|
|
dst = (guchar*)dst_bmp->data + y * dst_bmp->rowstride;
|
|
|
|
for (x = 0; x < bmp->width; x++)
|
|
{
|
|
/* FIXME: Would be nice to at least remove this inner
|
|
* branching, but not sure it can be done without
|
|
* rewriting of the whole loop */
|
|
switch (bmp->format & COGL_UNPREMULT_MASK)
|
|
{
|
|
case COGL_PIXEL_FORMAT_G_8:
|
|
_cogl_g_to_rgba (src, temp_rgba); break;
|
|
case COGL_PIXEL_FORMAT_RGB_888:
|
|
_cogl_rgb_to_rgba (src, temp_rgba); break;
|
|
case COGL_PIXEL_FORMAT_BGR_888:
|
|
_cogl_bgr_to_rgba (src, temp_rgba); break;
|
|
case COGL_PIXEL_FORMAT_RGBA_8888:
|
|
_cogl_rgba_to_rgba (src, temp_rgba); break;
|
|
case COGL_PIXEL_FORMAT_BGRA_8888:
|
|
_cogl_bgra_to_rgba (src, temp_rgba); break;
|
|
case COGL_PIXEL_FORMAT_ARGB_8888:
|
|
_cogl_argb_to_rgba (src, temp_rgba); break;
|
|
case COGL_PIXEL_FORMAT_ABGR_8888:
|
|
_cogl_abgr_to_rgba (src, temp_rgba); break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
switch (dst_format & COGL_UNPREMULT_MASK)
|
|
{
|
|
case COGL_PIXEL_FORMAT_G_8:
|
|
_cogl_rgba_to_g (temp_rgba, dst); break;
|
|
case COGL_PIXEL_FORMAT_RGB_888:
|
|
_cogl_rgba_to_rgb (temp_rgba, dst); break;
|
|
case COGL_PIXEL_FORMAT_BGR_888:
|
|
_cogl_rgba_to_bgr (temp_rgba, dst); break;
|
|
case COGL_PIXEL_FORMAT_RGBA_8888:
|
|
_cogl_rgba_to_rgba (temp_rgba, dst); break;
|
|
case COGL_PIXEL_FORMAT_BGRA_8888:
|
|
_cogl_rgba_to_bgra (temp_rgba, dst); break;
|
|
case COGL_PIXEL_FORMAT_ARGB_8888:
|
|
_cogl_rgba_to_argb (temp_rgba, dst); break;
|
|
case COGL_PIXEL_FORMAT_ABGR_8888:
|
|
_cogl_rgba_to_abgr (temp_rgba, dst); break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
src += src_bpp;
|
|
dst += dst_bpp;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_unpremult (CoglBitmap *bmp)
|
|
{
|
|
guchar *p;
|
|
gint x,y;
|
|
|
|
/* Make sure format supported for un-premultiplication */
|
|
if (!_cogl_bitmap_fallback_can_unpremult (bmp->format))
|
|
return FALSE;
|
|
|
|
for (y = 0; y < bmp->height; y++)
|
|
{
|
|
p = (guchar*) bmp->data + y * bmp->rowstride;
|
|
|
|
if (bmp->format & COGL_AFIRST_BIT)
|
|
{
|
|
for (x = 0; x < bmp->width; x++)
|
|
{
|
|
if (p[0] == 0)
|
|
_cogl_unpremult_alpha_0 (p);
|
|
else
|
|
_cogl_unpremult_alpha_first (p);
|
|
p += 4;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (x = 0; x < bmp->width; x++)
|
|
{
|
|
if (p[3] == 0)
|
|
_cogl_unpremult_alpha_0 (p);
|
|
else
|
|
_cogl_unpremult_alpha_last (p);
|
|
p += 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
bmp->format &= ~COGL_PREMULT_BIT;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_premult (CoglBitmap *bmp)
|
|
{
|
|
guchar *p;
|
|
gint x,y;
|
|
|
|
/* Make sure format supported for un-premultiplication */
|
|
if (!_cogl_bitmap_fallback_can_premult (bmp->format))
|
|
return FALSE;
|
|
|
|
for (y = 0; y < bmp->height; y++)
|
|
{
|
|
p = (guchar*) bmp->data + y * bmp->rowstride;
|
|
|
|
if (bmp->format & COGL_AFIRST_BIT)
|
|
{
|
|
for (x = 0; x < bmp->width; x++)
|
|
{
|
|
_cogl_premult_alpha_first (p);
|
|
p += 4;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (x = 0; x < bmp->width; x++)
|
|
{
|
|
_cogl_premult_alpha_last (p);
|
|
p += 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
bmp->format |= COGL_PREMULT_BIT;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_bitmap_fallback_from_file (CoglBitmap *bmp,
|
|
const gchar *filename)
|
|
{
|
|
/* FIXME: use jpeglib, libpng, etc. manually maybe */
|
|
return FALSE;
|
|
}
|