The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/core/SkPaintPriv.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,78 @@
     1.4 +/*
     1.5 + * Copyright 2013 Google Inc.
     1.6 + *
     1.7 + * Use of this source code is governed by a BSD-style license that can be
     1.8 + * found in the LICENSE file.
     1.9 + */
    1.10 +
    1.11 +#include "SkPaintPriv.h"
    1.12 +
    1.13 +#include "SkBitmap.h"
    1.14 +#include "SkColorFilter.h"
    1.15 +#include "SkPaint.h"
    1.16 +#include "SkShader.h"
    1.17 +
    1.18 +bool isPaintOpaque(const SkPaint* paint,
    1.19 +                   const SkBitmap* bmpReplacesShader) {
    1.20 +    // TODO: SkXfermode should have a virtual isOpaque method, which would
    1.21 +    // make it possible to test modes that do not have a Coeff representation.
    1.22 +
    1.23 +    if (!paint) {
    1.24 +        return bmpReplacesShader ? bmpReplacesShader->isOpaque() : true;
    1.25 +    }
    1.26 +
    1.27 +    SkXfermode::Coeff srcCoeff, dstCoeff;
    1.28 +    if (SkXfermode::AsCoeff(paint->getXfermode(), &srcCoeff, &dstCoeff)){
    1.29 +        if (SkXfermode::kDA_Coeff == srcCoeff || SkXfermode::kDC_Coeff == srcCoeff ||
    1.30 +            SkXfermode::kIDA_Coeff == srcCoeff || SkXfermode::kIDC_Coeff == srcCoeff) {
    1.31 +            return false;
    1.32 +        }
    1.33 +        switch (dstCoeff) {
    1.34 +        case SkXfermode::kZero_Coeff:
    1.35 +            return true;
    1.36 +        case SkXfermode::kISA_Coeff:
    1.37 +            if (paint->getAlpha() != 255) {
    1.38 +                break;
    1.39 +            }
    1.40 +            if (bmpReplacesShader) {
    1.41 +                if (!bmpReplacesShader->isOpaque()) {
    1.42 +                    break;
    1.43 +                }
    1.44 +            } else if (paint->getShader() && !paint->getShader()->isOpaque()) {
    1.45 +                break;
    1.46 +            }
    1.47 +            if (paint->getColorFilter() &&
    1.48 +                ((paint->getColorFilter()->getFlags() &
    1.49 +                SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
    1.50 +                break;
    1.51 +            }
    1.52 +            return true;
    1.53 +        case SkXfermode::kSA_Coeff:
    1.54 +            if (paint->getAlpha() != 0) {
    1.55 +                break;
    1.56 +            }
    1.57 +            if (paint->getColorFilter() &&
    1.58 +                ((paint->getColorFilter()->getFlags() &
    1.59 +                SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
    1.60 +                break;
    1.61 +            }
    1.62 +            return true;
    1.63 +        case SkXfermode::kSC_Coeff:
    1.64 +            if (paint->getColor() != 0) { // all components must be 0
    1.65 +                break;
    1.66 +            }
    1.67 +            if (bmpReplacesShader || paint->getShader()) {
    1.68 +                break;
    1.69 +            }
    1.70 +            if (paint->getColorFilter() && (
    1.71 +                (paint->getColorFilter()->getFlags() &
    1.72 +                SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
    1.73 +                break;
    1.74 +            }
    1.75 +            return true;
    1.76 +        default:
    1.77 +            break;
    1.78 +        }
    1.79 +    }
    1.80 +    return false;
    1.81 +}