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93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxAlphaRecovery.h"
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#include "gfxImageSurface.h"
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#define MOZILLA_SSE_INCLUDE_HEADER_FOR_SSE2
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#include "mozilla/SSE.h"
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/* static */ bool
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gfxAlphaRecovery::RecoverAlpha(gfxImageSurface* blackSurf,
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const gfxImageSurface* whiteSurf,
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Analysis* analysis)
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{
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gfxIntSize size = blackSurf->GetSize();
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if (size != whiteSurf->GetSize() ||
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(blackSurf->Format() != gfxASurface::ImageFormatARGB32 &&
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blackSurf->Format() != gfxASurface::ImageFormatRGB24) ||
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(whiteSurf->Format() != gfxASurface::ImageFormatARGB32 &&
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whiteSurf->Format() != gfxASurface::ImageFormatRGB24))
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return false;
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#ifdef MOZILLA_MAY_SUPPORT_SSE2
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if (!analysis && mozilla::supports_sse2() &&
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RecoverAlphaSSE2(blackSurf, whiteSurf)) {
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return true;
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}
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#endif
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blackSurf->Flush();
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whiteSurf->Flush();
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unsigned char* blackData = blackSurf->Data();
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unsigned char* whiteData = whiteSurf->Data();
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/* Get the alpha value of 'first' */
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PRUint32 first;
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if (size.width == 0 || size.height == 0) {
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first = 0;
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} else {
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if (!blackData || !whiteData)
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return false;
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first = RecoverPixel(*reinterpret_cast<PRUint32*>(blackData),
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*reinterpret_cast<PRUint32*>(whiteData));
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}
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PRUint32 deltas = 0;
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for (PRInt32 i = 0; i < size.height; ++i) {
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PRUint32* blackPixel = reinterpret_cast<PRUint32*>(blackData);
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const PRUint32* whitePixel = reinterpret_cast<PRUint32*>(whiteData);
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for (PRInt32 j = 0; j < size.width; ++j) {
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PRUint32 recovered = RecoverPixel(blackPixel[j], whitePixel[j]);
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blackPixel[j] = recovered;
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deltas |= (first ^ recovered);
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}
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blackData += blackSurf->Stride();
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whiteData += whiteSurf->Stride();
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}
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blackSurf->MarkDirty();
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if (analysis) {
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analysis->uniformAlpha = (deltas >> 24) == 0;
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analysis->uniformColor = false;
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if (analysis->uniformAlpha) {
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double d_first_alpha = first >> 24;
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analysis->alpha = d_first_alpha/255.0;
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/* we only set uniformColor when the alpha is already uniform.
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it's only useful in that case ... and if the alpha was nonuniform
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then computing whether the color is uniform would require unpremultiplying
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every pixel */
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analysis->uniformColor = deltas == 0;
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if (analysis->uniformColor) {
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if (d_first_alpha == 0.0) {
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/* can't unpremultiply, this is OK */
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analysis->r = analysis->g = analysis->b = 0.0;
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} else {
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analysis->r = (first & 0xFF)/d_first_alpha;
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analysis->g = ((first >> 8) & 0xFF)/d_first_alpha;
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analysis->b = ((first >> 16) & 0xFF)/d_first_alpha;
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}
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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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