The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/skia/trunk/src/image/SkImage.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,138 @@
     1.4 +/*
     1.5 + * Copyright 2012 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 "SkBitmap.h"
    1.12 +#include "SkCanvas.h"
    1.13 +#include "SkImagePriv.h"
    1.14 +#include "SkImage_Base.h"
    1.15 +
    1.16 +static SkImage_Base* as_IB(SkImage* image) {
    1.17 +    return static_cast<SkImage_Base*>(image);
    1.18 +}
    1.19 +
    1.20 +static const SkImage_Base* as_IB(const SkImage* image) {
    1.21 +    return static_cast<const SkImage_Base*>(image);
    1.22 +}
    1.23 +
    1.24 +uint32_t SkImage::NextUniqueID() {
    1.25 +    static int32_t gUniqueID;
    1.26 +
    1.27 +    // never return 0;
    1.28 +    uint32_t id;
    1.29 +    do {
    1.30 +        id = sk_atomic_inc(&gUniqueID) + 1;
    1.31 +    } while (0 == id);
    1.32 +    return id;
    1.33 +}
    1.34 +
    1.35 +void SkImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y,
    1.36 +                   const SkPaint* paint) {
    1.37 +    as_IB(this)->onDraw(canvas, x, y, paint);
    1.38 +}
    1.39 +
    1.40 +void SkImage::draw(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
    1.41 +                   const SkPaint* paint) {
    1.42 +    as_IB(this)->onDrawRectToRect(canvas, src, dst, paint);
    1.43 +}
    1.44 +
    1.45 +const void* SkImage::peekPixels(SkImageInfo* info, size_t* rowBytes) const {
    1.46 +    SkImageInfo infoStorage;
    1.47 +    size_t rowBytesStorage;
    1.48 +    if (NULL == info) {
    1.49 +        info = &infoStorage;
    1.50 +    }
    1.51 +    if (NULL == rowBytes) {
    1.52 +        rowBytes = &rowBytesStorage;
    1.53 +    }
    1.54 +    return as_IB(this)->onPeekPixels(info, rowBytes);
    1.55 +}
    1.56 +
    1.57 +bool SkImage::readPixels(SkBitmap* bitmap, const SkIRect* subset) const {
    1.58 +    if (NULL == bitmap) {
    1.59 +        return false;
    1.60 +    }
    1.61 +
    1.62 +    SkIRect bounds = SkIRect::MakeWH(this->width(), this->height());
    1.63 +
    1.64 +    // trim against the bitmap, if its already been allocated
    1.65 +    if (bitmap->pixelRef()) {
    1.66 +        bounds.fRight = SkMin32(bounds.fRight, bitmap->width());
    1.67 +        bounds.fBottom = SkMin32(bounds.fBottom, bitmap->height());
    1.68 +        if (bounds.isEmpty()) {
    1.69 +            return false;
    1.70 +        }
    1.71 +    }
    1.72 +
    1.73 +    if (subset && !bounds.intersect(*subset)) {
    1.74 +        // perhaps we could return true + empty-bitmap?
    1.75 +        return false;
    1.76 +    }
    1.77 +    return as_IB(this)->onReadPixels(bitmap, bounds);
    1.78 +}
    1.79 +
    1.80 +GrTexture* SkImage::getTexture() {
    1.81 +    return as_IB(this)->onGetTexture();
    1.82 +}
    1.83 +
    1.84 +SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const {
    1.85 +    SkBitmap bm;
    1.86 +    if (as_IB(this)->getROPixels(&bm)) {
    1.87 +        return SkImageEncoder::EncodeData(bm, type, quality);
    1.88 +    }
    1.89 +    return NULL;
    1.90 +}
    1.91 +
    1.92 +///////////////////////////////////////////////////////////////////////////////
    1.93 +
    1.94 +static bool raster_canvas_supports(const SkImageInfo& info) {
    1.95 +    switch (info.fColorType) {
    1.96 +        case kPMColor_SkColorType:
    1.97 +            return kUnpremul_SkAlphaType != info.fAlphaType;
    1.98 +        case kRGB_565_SkColorType:
    1.99 +            return true;
   1.100 +        case kAlpha_8_SkColorType:
   1.101 +            return true;
   1.102 +        default:
   1.103 +            break;
   1.104 +    }
   1.105 +    return false;
   1.106 +}
   1.107 +
   1.108 +bool SkImage_Base::onReadPixels(SkBitmap* bitmap, const SkIRect& subset) const {
   1.109 +    SkImageInfo info;
   1.110 +
   1.111 +    if (bitmap->pixelRef()) {
   1.112 +        if (!bitmap->asImageInfo(&info)) {
   1.113 +            return false;
   1.114 +        }
   1.115 +        if (!raster_canvas_supports(info)) {
   1.116 +            return false;
   1.117 +        }
   1.118 +    } else {
   1.119 +        SkImageInfo info = SkImageInfo::MakeN32Premul(subset.width(),
   1.120 +                                                      subset.height());
   1.121 +        SkBitmap tmp;
   1.122 +        if (!tmp.allocPixels(info)) {
   1.123 +            return false;
   1.124 +        }
   1.125 +        *bitmap = tmp;
   1.126 +    }
   1.127 +
   1.128 +    SkRect srcR, dstR;
   1.129 +    srcR.set(subset);
   1.130 +    dstR = srcR;
   1.131 +    dstR.offset(-dstR.left(), -dstR.top());
   1.132 +
   1.133 +    SkCanvas canvas(*bitmap);
   1.134 +
   1.135 +    SkPaint paint;
   1.136 +    paint.setXfermodeMode(SkXfermode::kClear_Mode);
   1.137 +    canvas.drawRect(dstR, paint);
   1.138 +
   1.139 +    const_cast<SkImage_Base*>(this)->onDrawRectToRect(&canvas, &srcR, dstR, NULL);
   1.140 +    return true;
   1.141 +}