mirror of
https://github.com/brl/mutter.git
synced 2024-12-30 22:52:15 +00:00
9d3aa57604
The _cogl_unpremult_alpha_{first,last} functions which
_cogl_bitmap_fallback_unpremult depends on were incorrectly casting each
of the byte components of a texel to a gulong and performing shifts as
if it were dealing with the whole texel.
It now just uses array indexing to access the byte components without
needing to cast or manually shift any bits around.
Even though we used to depend on unpremult whenever we used a
ClutterCairoTexture, clutter_cairo_texture_context_destroy had it's own
unpremult code which worked which is why this bug wouldn't have been noticed
before.
461 lines
11 KiB
C
461 lines
11 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 (const guchar *src, 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 (const guchar *src, guchar *dst)
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{
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guchar alpha = src[3];
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dst[0] = (src[0] * 255) / alpha;
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dst[1] = (src[1] * 255) / alpha;
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dst[2] = (src[2] * 255) / alpha;
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dst[3] = alpha;
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}
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inline static void
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_cogl_unpremult_alpha_first (const guchar *src, guchar *dst)
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{
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guchar alpha = src[0];
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dst[0] = alpha;
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dst[1] = (src[1] * 255) / alpha;
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dst[2] = (src[2] * 255) / alpha;
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dst[3] = (src[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,c,a,t) G_STMT_START { t = c * a + 128; d = ((t >> 8) + t) >> 8; } G_STMT_END
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inline static void
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_cogl_premult_alpha_last (const guchar *src, guchar *dst)
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{
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guchar alpha = src[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], src[0], alpha, t1);
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MULT(dst[1], src[1], alpha, t2);
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MULT(dst[2], src[2], alpha, t3);
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dst[3] = alpha;
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}
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inline static void
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_cogl_premult_alpha_first (const guchar *src, guchar *dst)
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{
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guchar alpha = src[0];
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guint t1, t2, t3;
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dst[0] = alpha;
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MULT(dst[1], src[1], alpha, t1);
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MULT(dst[2], src[2], alpha, t2);
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MULT(dst[3], src[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 (const CoglBitmap *bmp,
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CoglBitmap *dst_bmp)
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{
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guchar *src;
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guchar *dst;
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gint bpp;
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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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bpp = _cogl_get_format_bpp (bmp->format);
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/* Initialize destination bitmap */
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*dst_bmp = *bmp;
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dst_bmp->format = (bmp->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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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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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 (src[0] == 0)
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_cogl_unpremult_alpha_0 (src, dst);
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else
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_cogl_unpremult_alpha_first (src, dst);
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src += bpp;
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dst += bpp;
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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 (src[0] == 0)
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_cogl_unpremult_alpha_0 (src, dst);
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else
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_cogl_unpremult_alpha_last (src, dst);
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src += bpp;
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dst += bpp;
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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 (const CoglBitmap *bmp,
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CoglBitmap *dst_bmp)
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{
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guchar *src;
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guchar *dst;
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gint bpp;
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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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bpp = _cogl_get_format_bpp (bmp->format);
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/* Initialize destination bitmap */
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*dst_bmp = *bmp;
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dst_bmp->format |= COGL_PREMULT_BIT;
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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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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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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 (src, dst);
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src += bpp;
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dst += bpp;
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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 (src, dst);
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src += bpp;
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dst += bpp;
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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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