LCOV - code coverage report
Current view: directory - gfx/thebes - gfxAlphaRecovery.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 45 0 0.0 %
Date: 2012-06-02 Functions: 1 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Thebes gfx.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2007
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Vladimir Vukicevic <vladimir@pobox.com>
      23                 :  *   Bas Schouten <bschouten@mozilla.com>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : #include "gfxAlphaRecovery.h"
      40                 : 
      41                 : #include "gfxImageSurface.h"
      42                 : 
      43                 : #define MOZILLA_SSE_INCLUDE_HEADER_FOR_SSE2
      44                 : #include "mozilla/SSE.h"
      45                 : 
      46                 : /* static */ bool
      47               0 : gfxAlphaRecovery::RecoverAlpha(gfxImageSurface* blackSurf,
      48                 :                                const gfxImageSurface* whiteSurf,
      49                 :                                Analysis* analysis)
      50                 : {
      51               0 :     gfxIntSize size = blackSurf->GetSize();
      52                 : 
      53               0 :     if (size != whiteSurf->GetSize() ||
      54               0 :         (blackSurf->Format() != gfxASurface::ImageFormatARGB32 &&
      55               0 :          blackSurf->Format() != gfxASurface::ImageFormatRGB24) ||
      56               0 :         (whiteSurf->Format() != gfxASurface::ImageFormatARGB32 &&
      57               0 :          whiteSurf->Format() != gfxASurface::ImageFormatRGB24))
      58               0 :         return false;
      59                 : 
      60                 : #ifdef MOZILLA_MAY_SUPPORT_SSE2
      61               0 :     if (!analysis && mozilla::supports_sse2() &&
      62               0 :         RecoverAlphaSSE2(blackSurf, whiteSurf)) {
      63               0 :         return true;
      64                 :     }
      65                 : #endif
      66                 : 
      67               0 :     blackSurf->Flush();
      68               0 :     whiteSurf->Flush();
      69                 : 
      70               0 :     unsigned char* blackData = blackSurf->Data();
      71               0 :     unsigned char* whiteData = whiteSurf->Data();
      72                 : 
      73                 :     /* Get the alpha value of 'first' */
      74                 :     PRUint32 first;
      75               0 :     if (size.width == 0 || size.height == 0) {
      76               0 :         first = 0;
      77                 :     } else {
      78               0 :         if (!blackData || !whiteData)
      79               0 :             return false;
      80                 : 
      81                 :         first = RecoverPixel(*reinterpret_cast<PRUint32*>(blackData),
      82               0 :                              *reinterpret_cast<PRUint32*>(whiteData));
      83                 :     }
      84                 : 
      85               0 :     PRUint32 deltas = 0;
      86               0 :     for (PRInt32 i = 0; i < size.height; ++i) {
      87               0 :         PRUint32* blackPixel = reinterpret_cast<PRUint32*>(blackData);
      88               0 :         const PRUint32* whitePixel = reinterpret_cast<PRUint32*>(whiteData);
      89               0 :         for (PRInt32 j = 0; j < size.width; ++j) {
      90               0 :             PRUint32 recovered = RecoverPixel(blackPixel[j], whitePixel[j]);
      91               0 :             blackPixel[j] = recovered;
      92               0 :             deltas |= (first ^ recovered);
      93                 :         }
      94               0 :         blackData += blackSurf->Stride();
      95               0 :         whiteData += whiteSurf->Stride();
      96                 :     }
      97                 : 
      98               0 :     blackSurf->MarkDirty();
      99                 :     
     100               0 :     if (analysis) {
     101               0 :         analysis->uniformAlpha = (deltas >> 24) == 0;
     102               0 :         analysis->uniformColor = false;
     103               0 :         if (analysis->uniformAlpha) {
     104               0 :             double d_first_alpha = first >> 24;
     105               0 :             analysis->alpha = d_first_alpha/255.0;
     106                 :             /* we only set uniformColor when the alpha is already uniform.
     107                 :                it's only useful in that case ... and if the alpha was nonuniform
     108                 :                then computing whether the color is uniform would require unpremultiplying
     109                 :                every pixel */
     110               0 :             analysis->uniformColor = deltas == 0;
     111               0 :             if (analysis->uniformColor) {
     112               0 :                 if (d_first_alpha == 0.0) {
     113                 :                     /* can't unpremultiply, this is OK */
     114               0 :                     analysis->r = analysis->g = analysis->b = 0.0;
     115                 :                 } else {
     116               0 :                     analysis->r = (first & 0xFF)/d_first_alpha;
     117               0 :                     analysis->g = ((first >> 8) & 0xFF)/d_first_alpha;
     118               0 :                     analysis->b = ((first >> 16) & 0xFF)/d_first_alpha;
     119                 :                 }
     120                 :             }
     121                 :         }
     122                 :     }
     123                 : 
     124               0 :     return true;
     125                 : }

Generated by: LCOV version 1.7