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mutter-performance-source/clutter/cogl/common/cogl-bitmap-fallback.c

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/*
* Clutter COGL
*
* A basic GL/GLES Abstraction/Utility Layer
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2007 OpenedHand
*
* 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.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 (const guchar *src, guchar *dst)
{
dst[0] = 0;
dst[1] = 0;
dst[2] = 0;
dst[3] = 0;
}
inline static void
_cogl_unpremult_alpha_last (const guchar *src, guchar *dst)
{
guchar alpha = src[3];
dst[0] = ((((gulong) src[0] >> 16) & 0xff) * 255 ) / alpha;
dst[1] = ((((gulong) src[1] >> 8) & 0xff) * 255 ) / alpha;
dst[2] = ((((gulong) src[2] >> 0) & 0xff) * 255 ) / alpha;
dst[3] = alpha;
}
inline static void
_cogl_unpremult_alpha_first (const guchar *src, guchar *dst)
{
guchar alpha = src[0];
dst[0] = alpha;
dst[1] = ((((gulong) src[1] >> 16) & 0xff) * 255 ) / alpha;
dst[2] = ((((gulong) src[2] >> 8) & 0xff) * 255 ) / alpha;
dst[3] = ((((gulong) src[3] >> 0) & 0xff) * 255 ) / alpha;
}
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_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 (const CoglBitmap *bmp,
CoglBitmap *dst_bmp)
{
guchar *src;
guchar *dst;
gint bpp;
gint x,y;
/* Make sure format supported for un-premultiplication */
if (!_cogl_bitmap_fallback_can_unpremult (bmp->format))
return FALSE;
bpp = _cogl_get_format_bpp (bmp->format);
/* Initialize destination bitmap */
*dst_bmp = *bmp;
dst_bmp->format = (bmp->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 */
if (bmp->format & COGL_AFIRST_BIT)
{
if (src[0] == 0)
_cogl_unpremult_alpha_0 (src, dst);
else
_cogl_unpremult_alpha_first (src, dst);
}
else
{
if (src[3] == 0)
_cogl_unpremult_alpha_0 (src, dst);
else
_cogl_unpremult_alpha_last (src, dst);
}
src += bpp;
dst += bpp;
}
}
return TRUE;
}
gboolean
_cogl_bitmap_fallback_from_file (CoglBitmap *bmp,
const gchar *filename)
{
/* FIXME: use jpeglib, libpng, etc. manually maybe */
return FALSE;
}