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https://github.com/brl/mutter.git
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a6f061e41f
The premult part of _cogl_convert_premult has now been split out as _cogl_convert_premult_status. _cogl_convert_premult has been renamed to _cogl_convert_format to make it less confusing. The premult conversion is now done in-place instead of copying the buffer. Previously it was copying the buffer once for the format conversion and then copying it again for the premult conversion. The premult conversion never changes the size of the buffer so it's quite easy to do in place. We can also use the separated out function independently.
427 lines
9.5 KiB
C
427 lines
9.5 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-bitmap-private.h"
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#include <string.h>
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/* TO rgba */
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inline static void
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_cogl_g_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[0];
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dst[2] = src[0];
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dst[3] = 255;
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}
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inline static void
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_cogl_rgb_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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dst[3] = 255;
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}
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inline static void
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_cogl_bgr_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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dst[3] = 255;
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}
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inline static void
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_cogl_bgra_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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dst[3] = src[3];
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}
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inline static void
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_cogl_argb_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[1];
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dst[1] = src[2];
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dst[2] = src[3];
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dst[3] = src[0];
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}
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inline static void
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_cogl_abgr_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[3];
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dst[1] = src[2];
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dst[2] = src[1];
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dst[3] = src[0];
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}
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inline static void
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_cogl_rgba_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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dst[3] = src[3];
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}
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/* FROM rgba */
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inline static void
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_cogl_rgba_to_g (const guchar *src, guchar *dst)
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{
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dst[0] = (src[0] + src[1] + src[2]) / 3;
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}
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inline static void
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_cogl_rgba_to_rgb (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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}
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inline static void
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_cogl_rgba_to_bgr (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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}
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inline static void
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_cogl_rgba_to_bgra (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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dst[3] = src[3];
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}
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inline static void
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_cogl_rgba_to_argb (const guchar *src, guchar *dst)
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{
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dst[0] = src[3];
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dst[1] = src[0];
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dst[2] = src[1];
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dst[3] = src[2];
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}
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inline static void
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_cogl_rgba_to_abgr (const guchar *src, guchar *dst)
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{
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dst[0] = src[3];
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dst[1] = src[2];
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dst[2] = src[1];
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dst[3] = src[0];
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}
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/* (Un)Premultiplication */
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inline static void
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_cogl_unpremult_alpha_0 (guchar *dst)
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{
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dst[0] = 0;
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dst[1] = 0;
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dst[2] = 0;
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dst[3] = 0;
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}
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inline static void
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_cogl_unpremult_alpha_last (guchar *dst)
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{
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guchar alpha = dst[3];
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dst[0] = (dst[0] * 255) / alpha;
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dst[1] = (dst[1] * 255) / alpha;
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dst[2] = (dst[2] * 255) / alpha;
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}
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inline static void
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_cogl_unpremult_alpha_first (guchar *dst)
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{
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guchar alpha = dst[0];
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dst[1] = (dst[1] * 255) / alpha;
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dst[2] = (dst[2] * 255) / alpha;
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dst[3] = (dst[3] * 255) / alpha;
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}
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/* No division form of floor((c*a + 128)/255) (I first encountered
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* this in the RENDER implementation in the X server.) Being exact
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* is important for a == 255 - we want to get exactly c.
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*/
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#define MULT(d,a,t) \
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G_STMT_START { \
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t = d * a + 128; \
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d = ((t >> 8) + t) >> 8; \
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} G_STMT_END
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inline static void
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_cogl_premult_alpha_last (guchar *dst)
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{
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guchar alpha = dst[3];
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/* Using a separate temporary per component has given slightly better
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* code generation with GCC in the past; it shouldn't do any worse in
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* any case.
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*/
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guint t1, t2, t3;
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MULT(dst[0], alpha, t1);
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MULT(dst[1], alpha, t2);
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MULT(dst[2], alpha, t3);
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}
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inline static void
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_cogl_premult_alpha_first (guchar *dst)
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{
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guchar alpha = dst[0];
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guint t1, t2, t3;
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MULT(dst[1], alpha, t1);
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MULT(dst[2], alpha, t2);
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MULT(dst[3], alpha, t3);
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}
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#undef MULT
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gboolean
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_cogl_bitmap_fallback_can_convert (CoglPixelFormat src, CoglPixelFormat dst)
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{
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if (src == dst)
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return FALSE;
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switch (src & COGL_UNORDERED_MASK)
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{
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case COGL_PIXEL_FORMAT_G_8:
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case COGL_PIXEL_FORMAT_24:
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case COGL_PIXEL_FORMAT_32:
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if ((dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_24 &&
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(dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_32 &&
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(dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_G_8)
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return FALSE;
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break;
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default:
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return FALSE;
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_can_unpremult (CoglPixelFormat format)
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{
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return ((format & COGL_UNORDERED_MASK) == COGL_PIXEL_FORMAT_32);
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}
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gboolean
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_cogl_bitmap_fallback_can_premult (CoglPixelFormat format)
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{
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return ((format & COGL_UNORDERED_MASK) == COGL_PIXEL_FORMAT_32);
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}
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gboolean
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_cogl_bitmap_fallback_convert (const CoglBitmap *bmp,
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CoglBitmap *dst_bmp,
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CoglPixelFormat dst_format)
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{
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guchar *src;
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guchar *dst;
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gint src_bpp;
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gint dst_bpp;
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gint x,y;
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guchar temp_rgba[4] = {0,0,0,0};
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/* Make sure conversion supported */
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if (!_cogl_bitmap_fallback_can_convert (bmp->format, dst_format))
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return FALSE;
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src_bpp = _cogl_get_format_bpp (bmp->format);
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dst_bpp = _cogl_get_format_bpp (dst_format);
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/* Initialize destination bitmap */
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*dst_bmp = *bmp;
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dst_bmp->rowstride = sizeof(guchar) * dst_bpp * dst_bmp->width;
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dst_bmp->format = ((bmp->format & COGL_PREMULT_BIT) |
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(dst_format & COGL_UNPREMULT_MASK));
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/* Allocate a new buffer to hold converted data */
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dst_bmp->data = g_malloc (sizeof(guchar)
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* dst_bmp->height
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* dst_bmp->rowstride);
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/* FIXME: Optimize */
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for (y = 0; y < bmp->height; y++)
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{
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src = (guchar*)bmp->data + y * bmp->rowstride;
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dst = (guchar*)dst_bmp->data + y * dst_bmp->rowstride;
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for (x = 0; x < bmp->width; x++)
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{
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/* FIXME: Would be nice to at least remove this inner
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* branching, but not sure it can be done without
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* rewriting of the whole loop */
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switch (bmp->format & COGL_UNPREMULT_MASK)
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{
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case COGL_PIXEL_FORMAT_G_8:
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_cogl_g_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_RGB_888:
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_cogl_rgb_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_BGR_888:
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_cogl_bgr_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_RGBA_8888:
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_cogl_rgba_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_BGRA_8888:
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_cogl_bgra_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_ARGB_8888:
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_cogl_argb_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_ABGR_8888:
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_cogl_abgr_to_rgba (src, temp_rgba); break;
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default:
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break;
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}
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switch (dst_format & COGL_UNPREMULT_MASK)
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{
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case COGL_PIXEL_FORMAT_G_8:
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_cogl_rgba_to_g (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_RGB_888:
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_cogl_rgba_to_rgb (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_BGR_888:
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_cogl_rgba_to_bgr (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_RGBA_8888:
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_cogl_rgba_to_rgba (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_BGRA_8888:
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_cogl_rgba_to_bgra (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_ARGB_8888:
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_cogl_rgba_to_argb (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_ABGR_8888:
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_cogl_rgba_to_abgr (temp_rgba, dst); break;
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default:
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break;
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}
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src += src_bpp;
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dst += dst_bpp;
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}
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_unpremult (CoglBitmap *bmp)
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{
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guchar *p;
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gint x,y;
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/* Make sure format supported for un-premultiplication */
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if (!_cogl_bitmap_fallback_can_unpremult (bmp->format))
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return FALSE;
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for (y = 0; y < bmp->height; y++)
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{
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p = (guchar*) bmp->data + y * bmp->rowstride;
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if (bmp->format & COGL_AFIRST_BIT)
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{
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for (x = 0; x < bmp->width; x++)
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{
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if (p[0] == 0)
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_cogl_unpremult_alpha_0 (p);
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else
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_cogl_unpremult_alpha_first (p);
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p += 4;
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}
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}
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else
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{
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for (x = 0; x < bmp->width; x++)
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{
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if (p[3] == 0)
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_cogl_unpremult_alpha_0 (p);
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else
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_cogl_unpremult_alpha_last (p);
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p += 4;
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}
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}
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_premult (CoglBitmap *bmp)
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{
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guchar *p;
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gint x,y;
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/* Make sure format supported for un-premultiplication */
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if (!_cogl_bitmap_fallback_can_premult (bmp->format))
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return FALSE;
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for (y = 0; y < bmp->height; y++)
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{
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p = (guchar*) bmp->data + y * bmp->rowstride;
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if (bmp->format & COGL_AFIRST_BIT)
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{
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for (x = 0; x < bmp->width; x++)
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{
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_cogl_premult_alpha_first (p);
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p += 4;
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}
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}
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else
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{
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for (x = 0; x < bmp->width; x++)
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{
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_cogl_premult_alpha_last (p);
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p += 4;
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}
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}
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_from_file (CoglBitmap *bmp,
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const gchar *filename)
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{
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/* FIXME: use jpeglib, libpng, etc. manually maybe */
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return FALSE;
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}
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