C++ SkBitmap::eraseColor方法代码示例

//.........这里部分代码省略.........
        }

        jint scaledBounds[4];
        if (willScale) {
            for (int i=0; i<4; i++) {
                scaledBounds[i] = (jint)((((jint*)peeker.fLayoutBounds)[i]*scale) + .5f);
            }
        } else {
            memcpy(scaledBounds, (jint*)peeker.fLayoutBounds, sizeof(scaledBounds));
        }
        env->SetIntArrayRegion(layoutBounds, 0, 4, scaledBounds);
        if (javaBitmap != NULL) {
            env->SetObjectField(javaBitmap, gBitmap_layoutBoundsFieldID, layoutBounds);
        }
    }

    if (willScale) {
        // This is weird so let me explain: we could use the scale parameter
        // directly, but for historical reasons this is how the corresponding
        // Dalvik code has always behaved. We simply recreate the behavior here.
        // The result is slightly different from simply using scale because of
        // the 0.5f rounding bias applied when computing the target image size
        const float sx = scaledWidth / float(decoded->width());
        const float sy = scaledHeight / float(decoded->height());

        SkBitmap::Config config = decoded->config();
        switch (config) {
        case SkBitmap::kNo_Config:
        case SkBitmap::kIndex8_Config:
        case SkBitmap::kRLE_Index8_Config:
            config = SkBitmap::kARGB_8888_Config;
            break;
        default:
            break;
        }

        bitmap->setConfig(config, scaledWidth, scaledHeight);
        bitmap->setIsOpaque(decoded->isOpaque());
        if (!bitmap->allocPixels(&javaAllocator, NULL)) {
            return nullObjectReturn("allocation failed for scaled bitmap");
        }
        bitmap->eraseColor(0);

        SkPaint paint;
        paint.setFilterBitmap(true);

        SkCanvas canvas(*bitmap);
        canvas.scale(sx, sy);
        canvas.drawBitmap(*decoded, 0.0f, 0.0f, &paint);

        // Save off the unscaled version of bitmap to be used in later
        // transformations if it would reduce memory pressure. Only do
        // so if it is being upscaled more than 50%, is bigger than
        // 256x256, and not too big to be keeping a copy of (<1MB).
        const int numUnscaledPixels = decoded->width() * decoded->height();
        if (sx > 1.5 && numUnscaledPixels > 65536 && numUnscaledPixels < 262144) {
            bitmap->setUnscaledBitmap(decoded);
            adb2.detach(); //responsibility for freeing decoded's memory is
            //transferred to bitmap's destructor
        }
    }

    if (padding) {
        if (peeker.fPatch != NULL) {
            GraphicsJNI::set_jrect(env, padding,
                                   peeker.fPatch->paddingLeft, peeker.fPatch->paddingTop,
                                   peeker.fPatch->paddingRight, peeker.fPatch->paddingBottom);
        } else {
            GraphicsJNI::set_jrect(env, padding, -1, -1, -1, -1);
        }
    }

    SkPixelRef* pr;
    if (isPurgeable) {
        pr = installPixelRef(bitmap, stream, sampleSize, doDither);
    } else {
        // if we get here, we're in kDecodePixels_Mode and will therefore
        // already have a pixelref installed.
        pr = bitmap->pixelRef();
    }
    if (pr == NULL) {
        return nullObjectReturn("Got null SkPixelRef");
    }

    if (!isMutable) {
        // promise we will never change our pixels (great for sharing and pictures)
        pr->setImmutable();
    }

    // detach bitmap from its autodeleter, since we want to own it now
    adb.detach();

    if (javaBitmap != NULL) {
        // If a java bitmap was passed in for reuse, pass it back
        return javaBitmap;
    }
    // now create the java bitmap
    return GraphicsJNI::createBitmap(env, bitmap, javaAllocator.getStorageObj(),
                                     isMutable, ninePatchChunk, layoutBounds, -1);
}

static void Bitmap_erase(JNIEnv* env, jobject, jlong bitmapHandle, jint color) {
    SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
    bitmap->eraseColor(color);
}

static void check(skiatest::Reporter* r,
                  const char path[],
                  SkISize size,
                  bool supportsScanlineDecoding,
                  bool supportsSubsetDecoding,
                  bool supports565 = true) {
    SkAutoTDelete<SkStream> stream(resource(path));
    if (!stream) {
        SkDebugf("Missing resource '%s'\n", path);
        return;
    }
    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
    if (!codec) {
        ERRORF(r, "Unable to decode '%s'", path);
        return;
    }

    // This test is used primarily to verify rewinding works properly.  Using kN32 allows
    // us to test this without the added overhead of creating different bitmaps depending
    // on the color type (ex: building a color table for kIndex8).  DM is where we test
    // decodes to all possible destination color types.
    SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
    REPORTER_ASSERT(r, info.dimensions() == size);

    {
        // Test decoding to 565
        SkImageInfo info565 = info.makeColorType(kRGB_565_SkColorType);
        SkCodec::Result expected = (supports565 && info.alphaType() == kOpaque_SkAlphaType) ?
                SkCodec::kSuccess : SkCodec::kInvalidConversion;
        test_info(r, codec, info565, expected, nullptr);
    }

    SkBitmap bm;
    bm.allocPixels(info);
    SkAutoLockPixels autoLockPixels(bm);
    SkCodec::Result result =
        codec->getPixels(info, bm.getPixels(), bm.rowBytes(), nullptr, nullptr, nullptr);
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);

    SkMD5::Digest digest;
    md5(bm, &digest);

    // verify that re-decoding gives the same result.
    test_info(r, codec, info, SkCodec::kSuccess, &digest);

    {
        // Check alpha type conversions
        if (info.alphaType() == kOpaque_SkAlphaType) {
            test_info(r, codec, info.makeAlphaType(kUnpremul_SkAlphaType),
                      SkCodec::kInvalidConversion, nullptr);
            test_info(r, codec, info.makeAlphaType(kPremul_SkAlphaType),
                      SkCodec::kInvalidConversion, nullptr);
        } else {
            // Decoding to opaque should fail
            test_info(r, codec, info.makeAlphaType(kOpaque_SkAlphaType),
                      SkCodec::kInvalidConversion, nullptr);
            SkAlphaType otherAt = info.alphaType();
            if (kPremul_SkAlphaType == otherAt) {
                otherAt = kUnpremul_SkAlphaType;
            } else {
                otherAt = kPremul_SkAlphaType;
            }
            // The other non-opaque alpha type should always succeed, but not match.
            test_info(r, codec, info.makeAlphaType(otherAt), SkCodec::kSuccess, nullptr);
        }
    }

    // Scanline decoding follows.

    stream.reset(resource(path));
    SkAutoTDelete<SkScanlineDecoder> scanlineDecoder(
            SkScanlineDecoder::NewFromStream(stream.detach()));
    if (supportsScanlineDecoding) {
        bm.eraseColor(SK_ColorYELLOW);
        REPORTER_ASSERT(r, scanlineDecoder);

        REPORTER_ASSERT(r, scanlineDecoder->start(info) == SkCodec::kSuccess);

        for (int y = 0; y < info.height(); y++) {
            result = scanlineDecoder->getScanlines(bm.getAddr(0, y), 1, 0);
            REPORTER_ASSERT(r, result == SkCodec::kSuccess);
        }
        // verify that scanline decoding gives the same result.
        if (SkScanlineDecoder::kTopDown_SkScanlineOrder == scanlineDecoder->getScanlineOrder()) {
            compare_to_good_digest(r, digest, bm);
        }
    } else {
        REPORTER_ASSERT(r, !scanlineDecoder);
    }

    // The rest of this function tests decoding subsets, and will decode an arbitrary number of
    // random subsets.
    // Do not attempt to decode subsets of an image of only once pixel, since there is no
    // meaningful subset.
    if (size.width() * size.height() == 1) {
        return;
    }

    SkRandom rand;
    SkIRect subset;
//.........这里部分代码省略.........

CanvasLayer::CanvasLayer(const CanvasLayer& layer)
    : LayerAndroid(layer)
    , m_canvas(0)
    , m_bitmap(0)
    , m_gpuCanvas(0)
{
    init();
    if (!layer.m_canvas) {
        // The canvas has already been destroyed - this shouldn't happen
        ALOGW("Creating a CanvasLayer for a destroyed canvas!");
        m_visibleContentRect = IntRect();
        m_offsetFromRenderer = IntSize();
        m_texture->setHwAccelerated(false);
        return;
    }
    // We are making a copy for the UI, sync the interesting bits
    m_visibleContentRect = layer.visibleContentRect();
    m_offsetFromRenderer = layer.offsetFromRenderer();
    bool previousState = m_texture->hasValidTexture();

    if(layer.m_canvas->isUsingGpuRendering())
        return;

    ImageBuffer* imageBuffer = layer.m_canvas->buffer();
    
    if (!previousState && layer.m_dirtyCanvas.isEmpty() && imageBuffer && !(imageBuffer->drawsUsingRecording())) {
        // We were previously in software and don't have anything new to draw,
        // so stay in software
        m_bitmap = layer.bitmap();
        SkSafeRef(m_bitmap);
    } else {

        if(imageBuffer && imageBuffer->drawsUsingRecording() && !layer.m_canvas->isUsingGpuRendering())
        {
            bool canUseGpuRendering = imageBuffer->canUseGpuRendering();

            if(canUseGpuRendering && layer.m_canvas->canUseGpuRendering())
            {
                layer.m_canvas->enableGpuRendering();
                CanvasLayer::setGpuCanvasStatus(layer.uniqueId(), true);
            }
        }

        // If recording is being used
        if(imageBuffer && imageBuffer->drawsUsingRecording())
        {
            GraphicsContext* gc = imageBuffer->context();
            //SkPicture* canvasRecording = gc->platformContext()->getRecordingPicture();

            SkPicture* canvasRecording = CanvasLayer::getRecordingPicture(this);
            SkBitmap* bitmap = CanvasLayer::getRecordingBitmap(this);
            SkCanvas* canvas = CanvasLayer::getRecordingCanvas(this);

            if(canvasRecording == NULL)
                return;

            if(bitmap == NULL || bitmap->width() != canvasRecording->width()
                    || bitmap->height() != canvasRecording->height())
            {
                SkBitmap* newBitmap = new SkBitmap();
                newBitmap->setConfig(SkBitmap::kARGB_8888_Config, canvasRecording->width(), canvasRecording->height());
                newBitmap->allocPixels();
                newBitmap->eraseColor(0);
                CanvasLayer::setRecordingBitmap(newBitmap, this);
                bitmap = newBitmap;
                if(canvas != NULL)
                    canvas->setBitmapDevice(*bitmap);
            }

            if(canvas == NULL)
            {
                canvas = new SkCanvas();
                canvas->setBitmapDevice(*bitmap);
                CanvasLayer::setRecordingCanvas(canvas, this);
            }

            canvas->drawARGB(0, 0, 0, 0, SkXfermode::kClear_Mode);
            canvasRecording->draw(canvas);

            if (!m_texture->uploadImageBitmap(bitmap)) {
                //SLOGD("+++++++++++++++++++++ Didn't upload bitmap .. fall back to software");
                // TODO:: Fix this
            }
        }
        else
        {
            if (!m_texture->uploadImageBuffer(layer.m_canvas->buffer())) {
                // Blargh, no surface texture or ImageBuffer - fall back to software
                m_bitmap = layer.bitmap();
                SkSafeRef(m_bitmap);
                // Merge the canvas invals with the layer's invals to repaint the needed
                // tiles.
                SkRegion::Iterator iter(layer.m_dirtyCanvas);
                const IntPoint& offset = m_visibleContentRect.location();
                for (; !iter.done(); iter.next()) {
                    SkIRect diff = iter.rect();
                    diff.fLeft += offset.x();
                    diff.fRight += offset.x();
                    diff.fTop += offset.y();
                    diff.fBottom += offset.y();
//.........这里部分代码省略.........

/**
 * This test case is a mirror of the Android CTS tests for MatrixColorFilter
 * found in the android.graphics.ColorMatrixColorFilterTest class.
 */
static inline void test_colorMatrixCTS(skiatest::Reporter* reporter) {

    SkBitmap bitmap;
    bitmap.allocN32Pixels(1,1);

    SkCanvas canvas(bitmap);
    SkPaint paint;

    SkScalar blueToCyan[20] = {
            1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
            0.0f, 1.0f, 1.0f, 0.0f, 0.0f,
            0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
            0.0f, 0.0f, 0.0f, 1.0f, 0.0f };
    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(blueToCyan));

    paint.setColor(SK_ColorBLUE);
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));

    paint.setColor(SK_ColorGREEN);
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SK_ColorGREEN, bitmap.getColor(0, 0));

    paint.setColor(SK_ColorRED);
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SK_ColorRED, bitmap.getColor(0, 0));

    // color components are clipped, not scaled
    paint.setColor(SK_ColorMAGENTA);
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SK_ColorWHITE, bitmap.getColor(0, 0));

    SkScalar transparentRedAddBlue[20] = {
            1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
            0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
            0.0f, 0.0f, 1.0f, 0.0f, 64.0f,
           -0.5f, 0.0f, 0.0f, 1.0f, 0.0f
    };
    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(transparentRedAddBlue));
    bitmap.eraseColor(SK_ColorTRANSPARENT);

    paint.setColor(SK_ColorRED);
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SkColorSetARGB(128, 255, 0, 64), bitmap.getColor(0, 0), 2);

    paint.setColor(SK_ColorCYAN);
    canvas.drawPoint(0, 0, paint);
    // blue gets clipped
    assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));

    // change array to filter out green
    REPORTER_ASSERT(reporter, 1.0f == transparentRedAddBlue[6]);
    transparentRedAddBlue[6] = 0.0f;

    // check that changing the array has no effect
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SK_ColorCYAN, bitmap.getColor(0, 0));

    // create a new filter with the changed matrix
    paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(transparentRedAddBlue));
    canvas.drawPoint(0, 0, paint);
    assert_color(reporter, SK_ColorBLUE, bitmap.getColor(0, 0));
}

// Test interlaced PNG in stripes, similar to DM's kStripe_Mode
DEF_TEST(Codec_stripes, r) {
    const char * path = "plane_interlaced.png";
    SkAutoTDelete<SkStream> stream(resource(path));
    if (!stream) {
        SkDebugf("Missing resource '%s'\n", path);
    }

    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
    REPORTER_ASSERT(r, codec);

    if (!codec) {
        return;
    }

    switch (codec->getScanlineOrder()) {
        case SkCodec::kBottomUp_SkScanlineOrder:
        case SkCodec::kOutOfOrder_SkScanlineOrder:
            ERRORF(r, "This scanline order will not match the original.");
            return;
        default:
            break;
    }

    // Baseline for what the image should look like, using N32.
    const SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);

    SkBitmap bm;
    bm.allocPixels(info);
    SkAutoLockPixels autoLockPixels(bm);
    SkCodec::Result result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);

    SkMD5::Digest digest;
    md5(bm, &digest);

    // Now decode in stripes
    const int height = info.height();
    const int numStripes = 4;
    int stripeHeight;
    int remainingLines;
    SkTDivMod(height, numStripes, &stripeHeight, &remainingLines);

    bm.eraseColor(SK_ColorYELLOW);

    result = codec->startScanlineDecode(info);
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);

    // Odd stripes
    for (int i = 1; i < numStripes; i += 2) {
        // Skip the even stripes
        bool skipResult = codec->skipScanlines(stripeHeight);
        REPORTER_ASSERT(r, skipResult);

        int linesDecoded = codec->getScanlines(bm.getAddr(0, i * stripeHeight), stripeHeight,
                                     bm.rowBytes());
        REPORTER_ASSERT(r, linesDecoded == stripeHeight);
    }

    // Even stripes
    result = codec->startScanlineDecode(info);
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);

    for (int i = 0; i < numStripes; i += 2) {
        int linesDecoded = codec->getScanlines(bm.getAddr(0, i * stripeHeight), stripeHeight,
                                     bm.rowBytes());
        REPORTER_ASSERT(r, linesDecoded == stripeHeight);

        // Skip the odd stripes
        if (i + 1 < numStripes) {
            bool skipResult = codec->skipScanlines(stripeHeight);
            REPORTER_ASSERT(r, skipResult);
        }
    }

    // Remainder at the end
    if (remainingLines > 0) {
        result = codec->startScanlineDecode(info);
        REPORTER_ASSERT(r, result == SkCodec::kSuccess);

        bool skipResult = codec->skipScanlines(height - remainingLines);
        REPORTER_ASSERT(r, skipResult);

        int linesDecoded = codec->getScanlines(bm.getAddr(0, height - remainingLines),
                                     remainingLines, bm.rowBytes());
        REPORTER_ASSERT(r, linesDecoded == remainingLines);
    }

    compare_to_good_digest(r, digest, bm);
}

static SkBitmap make_bm() {
    SkBitmap bm;
    bm.allocN32Pixels(WW, HH);
    bm.eraseColor(SK_ColorTRANSPARENT);
    return bm;
}

static SkBitmap create_bm() {
    SkBitmap bm;
    bm.allocN32Pixels(kFullSize, kFullSize, true);
    bm.eraseColor(SK_ColorTRANSPARENT);
    return bm;
}

static void check(skiatest::Reporter* r,
                  const char path[],
                  SkISize size,
                  bool supportsScanlineDecoding,
                  bool supportsSubsetDecoding) {
    SkAutoTDelete<SkStream> stream(resource(path));
    if (!stream) {
        SkDebugf("Missing resource '%s'\n", path);
        return;
    }
    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
    if (!codec) {
        ERRORF(r, "Unable to decode '%s'", path);
        return;
    }

    // This test is used primarily to verify rewinding works properly.  Using kN32 allows
    // us to test this without the added overhead of creating different bitmaps depending
    // on the color type (ex: building a color table for kIndex8).  DM is where we test
    // decodes to all possible destination color types.
    SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
    REPORTER_ASSERT(r, info.dimensions() == size);
    SkBitmap bm;
    bm.allocPixels(info);
    SkAutoLockPixels autoLockPixels(bm);
    SkCodec::Result result =
        codec->getPixels(info, bm.getPixels(), bm.rowBytes(), NULL, NULL, NULL);
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);

    SkMD5::Digest digest;
    md5(bm, &digest);

    bm.eraseColor(SK_ColorYELLOW);

    result =
        codec->getPixels(info, bm.getPixels(), bm.rowBytes(), NULL, NULL, NULL);

    REPORTER_ASSERT(r, result == SkCodec::kSuccess);
    // verify that re-decoding gives the same result.
    compare_to_good_digest(r, digest, bm);

    SkAutoTDelete<SkScanlineDecoder> scanlineDecoder(codec->getScanlineDecoder(info));
    if (supportsScanlineDecoding) {
        bm.eraseColor(SK_ColorYELLOW);
        REPORTER_ASSERT(r, scanlineDecoder);

        // Regular decodes should not be affected by creating a scanline decoder
        result = codec->getPixels(info, bm.getPixels(), bm.rowBytes(), NULL, NULL, NULL);
        REPORTER_ASSERT(r, SkCodec::kSuccess == result);
        compare_to_good_digest(r, digest, bm);

        bm.eraseColor(SK_ColorYELLOW);

        for (int y = 0; y < info.height(); y++) {
            result = scanlineDecoder->getScanlines(bm.getAddr(0, y), 1, 0);
            REPORTER_ASSERT(r, result == SkCodec::kSuccess);
        }
        // verify that scanline decoding gives the same result.
        compare_to_good_digest(r, digest, bm);
    } else {
        REPORTER_ASSERT(r, !scanlineDecoder);
    }

    // The rest of this function tests decoding subsets, and will decode an arbitrary number of
    // random subsets.
    // Do not attempt to decode subsets of an image of only once pixel, since there is no
    // meaningful subset.
    if (size.width() * size.height() == 1) {
        return;
    }

    SkRandom rand;
    SkIRect subset;
    SkCodec::Options opts;
    opts.fSubset = &subset;
    for (int i = 0; i < 5; i++) {
        subset = generate_random_subset(&rand, size.width(), size.height());
        SkASSERT(!subset.isEmpty());
        const bool supported = codec->getValidSubset(&subset);
        REPORTER_ASSERT(r, supported == supportsSubsetDecoding);

        SkImageInfo subsetInfo = info.makeWH(subset.width(), subset.height());
        SkBitmap bm;
        bm.allocPixels(subsetInfo);
        const SkCodec::Result result = codec->getPixels(bm.info(), bm.getPixels(), bm.rowBytes(),
                                                        &opts, NULL, NULL);

        if (supportsSubsetDecoding) {
            REPORTER_ASSERT(r, result == SkCodec::kSuccess);
            // Webp is the only codec that supports subsets, and it will have modified the subset
            // to have even left/top.
            REPORTER_ASSERT(r, SkIsAlign2(subset.fLeft) && SkIsAlign2(subset.fTop));
        } else {
            // No subsets will work.
            REPORTER_ASSERT(r, result == SkCodec::kUnimplemented);
        }
    }
}

int main (int argc, char * const argv[]) {
    SkAutoGraphics ag;
    
    const char* writePath = NULL;   // if non-null, where we write the originals
    const char* readPath = NULL;    // if non-null, were we read from to compare

    char* const* stop = argv + argc;
    for (++argv; argv < stop; ++argv) {
        if (strcmp(*argv, "-w") == 0) {
            argv++;
            if (argv < stop && **argv) {
                writePath = *argv;
            }
        } else if (strcmp(*argv, "-r") == 0) {
            argv++;
            if (argv < stop && **argv) {
                readPath = *argv;
            }
        }
    }
    
    Iter iter;
    GM* gm;
	
    while ((gm = iter.next()) != NULL) {
		SkISize size = gm->getISize();
        SkDebugf("creating... %s [%d %d]\n", gm->shortName(),
                 size.width(), size.height());

		SkBitmap bitmap;
		for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); i++) {
			bitmap.setConfig(gRec[i].fConfig, size.width(), size.height());
			bitmap.allocPixels();
			bitmap.eraseColor(0);
			SkCanvas canvas(bitmap);

			gm->draw(&canvas);
            
            SkString name = make_name(gm->shortName(), gRec[i].fName);

            if (writePath) {
                SkString path = make_filename(writePath, name);
                bool success = write_bitmap(path, bitmap);
                if (!success) {
                    fprintf(stderr, "FAILED to write %s\n", path.c_str());
                }
            } else if (readPath) {
                SkString path = make_filename(readPath, name);
                SkBitmap orig;
                bool success = SkImageDecoder::DecodeFile(path.c_str(), &orig,
                                    SkBitmap::kARGB_8888_Config,
                                    SkImageDecoder::kDecodePixels_Mode, NULL);
                if (success) {
                    compare(bitmap, orig, name);
                } else {
                    fprintf(stderr, "FAILED to read %s\n", path.c_str());
                }
            }
		}
        SkDELETE(gm);
    }
    return 0;
}

 void onDelayedSetup() override {
     fBitmap.allocN32Pixels(fW, fH, true);
     fBitmap.eraseColor(SK_ColorWHITE);  // so we don't read uninitialized memory
 }

//.........这里部分代码省略.........
    jintArray layoutBounds = NULL;
    if (peeker.fLayoutBounds != NULL) {
        layoutBounds = env->NewIntArray(4);
        if (layoutBounds == NULL) {
            return nullObjectReturn("layoutBounds == null");
        }

        jint scaledBounds[4];
        if (willScale) {
            for (int i=0; i<4; i++) {
                scaledBounds[i] = (jint)((((jint*)peeker.fLayoutBounds)[i]*scale) + .5f);
            }
        } else {
            memcpy(scaledBounds, (jint*)peeker.fLayoutBounds, sizeof(scaledBounds));
        }
        env->SetIntArrayRegion(layoutBounds, 0, 4, scaledBounds);
        if (javaBitmap != NULL) {
            env->SetObjectField(javaBitmap, gBitmap_layoutBoundsFieldID, layoutBounds);
        }
    }

    if (willScale) {
        // This is weird so let me explain: we could use the scale parameter
        // directly, but for historical reasons this is how the corresponding
        // Dalvik code has always behaved. We simply recreate the behavior here.
        // The result is slightly different from simply using scale because of
        // the 0.5f rounding bias applied when computing the target image size
        const float sx = scaledWidth / float(decodingBitmap.width());
        const float sy = scaledHeight / float(decodingBitmap.height());

        // TODO: avoid copying when scaled size equals decodingBitmap size
        SkBitmap::Config config = configForScaledOutput(decodingBitmap.config());
        outputBitmap->setConfig(config, scaledWidth, scaledHeight);
        outputBitmap->setIsOpaque(decodingBitmap.isOpaque());
        if (!outputBitmap->allocPixels(outputAllocator, NULL)) {
            return nullObjectReturn("allocation failed for scaled bitmap");
        }

        // If outputBitmap's pixels are newly allocated by Java, there is no need
        // to erase to 0, since the pixels were initialized to 0.
        if (outputAllocator != &javaAllocator) {
            outputBitmap->eraseColor(0);
        }

        SkPaint paint;
        paint.setFilterBitmap(true);

        SkCanvas canvas(*outputBitmap);
        canvas.scale(sx, sy);
        canvas.drawBitmap(decodingBitmap, 0.0f, 0.0f, &paint);
    } else {
        outputBitmap->swap(decodingBitmap);
    }

    if (padding) {
        if (peeker.fPatch != NULL) {
            GraphicsJNI::set_jrect(env, padding,
                    peeker.fPatch->paddingLeft, peeker.fPatch->paddingTop,
                    peeker.fPatch->paddingRight, peeker.fPatch->paddingBottom);
        } else {
            GraphicsJNI::set_jrect(env, padding, -1, -1, -1, -1);
        }
    }

    SkPixelRef* pr;
    if (isPurgeable) {
        pr = installPixelRef(outputBitmap, stream, sampleSize, doDither);
    } else {
        // if we get here, we're in kDecodePixels_Mode and will therefore
        // already have a pixelref installed.
        pr = outputBitmap->pixelRef();
    }
    if (pr == NULL) {
        return nullObjectReturn("Got null SkPixelRef");
    }

    if (!isMutable && javaBitmap == NULL) {
        // promise we will never change our pixels (great for sharing and pictures)
        pr->setImmutable();
    }

    // detach bitmap from its autodeleter, since we want to own it now
    adb.detach();

    if (javaBitmap != NULL) {
        bool isPremultiplied = !requireUnpremultiplied;
        GraphicsJNI::reinitBitmap(env, javaBitmap, outputBitmap, isPremultiplied);
        outputBitmap->notifyPixelsChanged();
        // If a java bitmap was passed in for reuse, pass it back
        return javaBitmap;
    }

    int bitmapCreateFlags = 0x0;
    if (isMutable) bitmapCreateFlags |= GraphicsJNI::kBitmapCreateFlag_Mutable;
    if (!requireUnpremultiplied) bitmapCreateFlags |= GraphicsJNI::kBitmapCreateFlag_Premultiplied;

    // now create the java bitmap
    return GraphicsJNI::createBitmap(env, outputBitmap, javaAllocator.getStorageObj(),
            bitmapCreateFlags, ninePatchChunk, layoutBounds, -1);
}

    virtual void onDraw(SkCanvas* canvas)
    {
        if (true) {
            SkRect r = { 0, 0, 1 << 30, 1 << 30 };
            bool open = canvas->clipRect(r);
            SkDebugf("---- giant clip is %d\n", open);
        }
        this->drawBG(canvas);
        
        if (false) {
            SkPaint paint;
            paint.setAntiAlias(true);
            SkBitmap bm;
            bm.setConfig(SkBitmap::kA8_Config, 100, 100);
            bm.allocPixels();
            bm.eraseColor(0);
            SkCanvas c(bm);
            c.drawCircle(50, 50, 50, paint);

            paint.setColor(SK_ColorBLUE);
            canvas->drawBitmap(bm, 0, 0, &paint);
            canvas->scale(SK_Scalar1/2, SK_Scalar1/2);
            paint.setColor(SK_ColorRED);
            canvas->drawBitmap(bm, 0, 0, &paint);
            return;
        }
        
#ifdef SK_DEBUG
        if (true) {
            SkRegion a, b, c;
            test_union_bug_1505668(&a, &b, &c);
            
            if (false) {    // draw the result of the test
                SkPaint paint;
                
                canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
                paint.setColor(SK_ColorRED);
                paint_rgn(canvas, a, paint);
                paint.setColor(0x800000FF);
                paint_rgn(canvas, b, paint);
                paint.setColor(SK_ColorBLACK);
                paint.setStyle(SkPaint::kStroke_Style);
             //   paint_rgn(canvas, c, paint);
                return;
            }
        }
#endif

        static const struct {
            SkColor         fColor;
            const char*     fName;
            SkRegion::Op    fOp;
        } gOps[] = {
            { SK_ColorBLACK,    "Difference",   SkRegion::kDifference_Op    },
            { SK_ColorRED,      "Intersect",    SkRegion::kIntersect_Op     },
            { 0xFF008800,       "Union",        SkRegion::kUnion_Op         },
            { SK_ColorBLUE,     "XOR",          SkRegion::kXOR_Op           }
        };

        SkPaint textPaint;
        textPaint.setAntiAlias(true);
        textPaint.setTextSize(SK_Scalar1*24);

        this->drawOrig(canvas, false);
        canvas->save();
            canvas->translate(SkIntToScalar(200), 0);
            this->drawRgnOped(canvas, SkRegion::kUnion_Op, SK_ColorBLACK);
        canvas->restore();
        
        canvas->translate(0, SkIntToScalar(200));

        for (int op = 0; op < SK_ARRAY_COUNT(gOps); op++)
        {
            canvas->drawText(gOps[op].fName, strlen(gOps[op].fName), SkIntToScalar(75), SkIntToScalar(50), textPaint);

            this->drawRgnOped(canvas, gOps[op].fOp, gOps[op].fColor);

            if (true)
            {
                canvas->save();
                canvas->translate(0, SkIntToScalar(200));
                this->drawPathOped(canvas, gOps[op].fOp, gOps[op].fColor);
                canvas->restore();
            }
            
            canvas->translate(SkIntToScalar(200), 0);
        }
    }

static void check(skiatest::Reporter* r,
                  const char path[],
                  SkISize size,
                  bool supportsScanlineDecoding,
                  bool supportsSubsetDecoding,
                  bool supportsIncomplete = true) {

    SkAutoTDelete<SkStream> stream(resource(path));
    if (!stream) {
        SkDebugf("Missing resource '%s'\n", path);
        return;
    }

    SkAutoTDelete<SkCodec> codec(nullptr);
    bool isIncomplete = supportsIncomplete;
    if (isIncomplete) {
        size_t size = stream->getLength();
        sk_sp<SkData> data((SkData::MakeFromStream(stream, 2 * size / 3)));
        codec.reset(SkCodec::NewFromData(data.get()));
    } else {
        codec.reset(SkCodec::NewFromStream(stream.release()));
    }
    if (!codec) {
        ERRORF(r, "Unable to decode '%s'", path);
        return;
    }

    // Test full image decodes with SkCodec
    SkMD5::Digest codecDigest;
    const SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
    SkBitmap bm;
    SkCodec::Result expectedResult = isIncomplete ? SkCodec::kIncompleteInput : SkCodec::kSuccess;
    test_codec(r, codec.get(), bm, info, size, expectedResult, &codecDigest, nullptr);

    // Scanline decoding follows.
    // Need to call startScanlineDecode() first.
    REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
            == 0);
    REPORTER_ASSERT(r, codec->skipScanlines(1)
            == 0);

    const SkCodec::Result startResult = codec->startScanlineDecode(info);
    if (supportsScanlineDecoding) {
        bm.eraseColor(SK_ColorYELLOW);

        REPORTER_ASSERT(r, startResult == SkCodec::kSuccess);

        for (int y = 0; y < info.height(); y++) {
            const int lines = codec->getScanlines(bm.getAddr(0, y), 1, 0);
            if (!isIncomplete) {
                REPORTER_ASSERT(r, 1 == lines);
            }
        }
        // verify that scanline decoding gives the same result.
        if (SkCodec::kTopDown_SkScanlineOrder == codec->getScanlineOrder()) {
            compare_to_good_digest(r, codecDigest, bm);
        }

        // Cannot continue to decode scanlines beyond the end
        REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
                == 0);

        // Interrupting a scanline decode with a full decode starts from
        // scratch
        REPORTER_ASSERT(r, codec->startScanlineDecode(info) == SkCodec::kSuccess);
        const int lines = codec->getScanlines(bm.getAddr(0, 0), 1, 0);
        if (!isIncomplete) {
            REPORTER_ASSERT(r, lines == 1);
        }
        REPORTER_ASSERT(r, codec->getPixels(bm.info(), bm.getPixels(), bm.rowBytes())
                == expectedResult);
        REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
                == 0);
        REPORTER_ASSERT(r, codec->skipScanlines(1)
                == 0);

        // Test partial scanline decodes
        if (supports_partial_scanlines(path) && info.width() >= 3) {
            SkCodec::Options options;
            int width = info.width();
            int height = info.height();
            SkIRect subset = SkIRect::MakeXYWH(2 * (width / 3), 0, width / 3, height);
            options.fSubset = &subset;

            const SkCodec::Result partialStartResult = codec->startScanlineDecode(info, &options,
                    nullptr, nullptr);
            REPORTER_ASSERT(r, partialStartResult == SkCodec::kSuccess);

            for (int y = 0; y < height; y++) {
                const int lines = codec->getScanlines(bm.getAddr(0, y), 1, 0);
                if (!isIncomplete) {
                    REPORTER_ASSERT(r, 1 == lines);
                }
            }
        }
    } else {
        REPORTER_ASSERT(r, startResult == SkCodec::kUnimplemented);
    }

    // The rest of this function tests decoding subsets, and will decode an arbitrary number of
//.........这里部分代码省略.........

static void initBitmap(SkBitmap& bitmap, uint32_t width, uint32_t height) {
    bitmap.allocPixels(SkImageInfo::MakeA8(width, height));
    bitmap.eraseColor(0);
}