Delete SkBitmapRegionCanvas

src/android/SkBitmapRegionCanvas.cpp

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkBitmapRegionCanvas.h"
-#include "SkBitmapRegionDecoderPriv.h"
-#include "SkCanvas.h"
-#include "SkCodecPriv.h"
-
-SkBitmapRegionCanvas::SkBitmapRegionCanvas(SkCodec* decoder)
-    : INHERITED(decoder->getInfo().width(), decoder->getInfo().height())
-    , fDecoder(decoder)
-{}
-
-bool SkBitmapRegionCanvas::decodeRegion(SkBitmap* bitmap, SkBRDAllocator* allocator,
-        const SkIRect& desiredSubset, int sampleSize, SkColorType dstColorType,
-        bool requireUnpremul) {
-
-    // Reject color types not supported by this method
-    if (kIndex_8_SkColorType == dstColorType || kGray_8_SkColorType == dstColorType) {
-        SkCodecPrintf("Error: Color type not supported.\n");
-        return false;
-    }
-
-    // Reject requests for unpremultiplied alpha
-    if (requireUnpremul) {
-        SkCodecPrintf("Error: Alpha type not supported.\n");
-        return false;
-    }
-    SkAlphaType dstAlphaType = fDecoder->getInfo().alphaType();
-    if (kUnpremul_SkAlphaType == dstAlphaType) {
-        dstAlphaType = kPremul_SkAlphaType;
-    }
-
-    // Fix the input sampleSize if necessary.
-    if (sampleSize < 1) {
-        sampleSize = 1;
-    }
-
-    // The size of the output bitmap is determined by the size of the
-    // requested subset, not by the size of the intersection of the subset
-    // and the image dimensions.
-    // If inputX is negative, we will need to place decoded pixels into the
-    // output bitmap starting at a left offset.  Call this outX.
-    // If outX is non-zero, subsetX must be zero.
-    // If inputY is negative, we will need to place decoded pixels into the
-    // output bitmap starting at a top offset.  Call this outY.
-    // If outY is non-zero, subsetY must be zero.
-    int outX;
-    int outY;
-    SkIRect subset = desiredSubset;
-    SubsetType type = adjust_subset_rect(fDecoder->getInfo().dimensions(), &subset, &outX, &outY);
-    if (SubsetType::kOutside_SubsetType == type) {
-        return false;
-    }
-
-    // Create the image info for the decode
-    SkImageInfo decodeInfo = SkImageInfo::Make(this->width(), this->height(),
-            dstColorType, dstAlphaType);
-
-    // Start the scanline decoder
-    SkCodec::Result r = fDecoder->startScanlineDecode(decodeInfo);
-    if (SkCodec::kSuccess != r) {
-        SkCodecPrintf("Error: Could not start scanline decoder.\n");
-        return false;
-    }
-
-    // Allocate a bitmap for the unscaled decode
-    SkBitmap tmp;
-    SkImageInfo tmpInfo = decodeInfo.makeWH(this->width(), subset.height());
-    if (!tmp.tryAllocPixels(tmpInfo)) {
-        SkCodecPrintf("Error: Could not allocate pixels.\n");
-        return false;
-    }
-
-    // Skip the unneeded rows
-    if (!fDecoder->skipScanlines(subset.y())) {
-        SkCodecPrintf("Error: Failed to skip scanlines.\n");
-        return false;
-    }
-
-    // Decode the necessary rows
-    fDecoder->getScanlines(tmp.getAddr(0, 0), subset.height(), tmp.rowBytes());
-
-    // Calculate the size of the output
-    const int outWidth = get_scaled_dimension(desiredSubset.width(), sampleSize);
-    const int outHeight = get_scaled_dimension(desiredSubset.height(), sampleSize);
-
-    // Initialize the destination bitmap
-    SkImageInfo dstInfo = decodeInfo.makeWH(outWidth, outHeight);
-    bitmap->setInfo(dstInfo, dstInfo.minRowBytes());
-    if (!bitmap->tryAllocPixels(allocator, nullptr)) {
-        SkCodecPrintf("Error: Could not allocate pixels.\n");
-        return false;
-    }
-
-    // Zero the bitmap if the region is not completely within the image.
-    // TODO (msarett): Can we make this faster by implementing it to only
-    //                 zero parts of the image that we won't overwrite with
-    //                 pixels?
-    if (SubsetType::kPartiallyInside_SubsetType == type) {
-        SkCodec::ZeroInitialized zeroInit = allocator ? allocator->zeroInit() :
-                    SkCodec::kNo_ZeroInitialized;
-        if (SkCodec::kNo_ZeroInitialized == zeroInit) {
-            bitmap->eraseColor(0);
-        }
-    }
-
-    // Use a canvas to crop and scale to the destination bitmap
-    SkCanvas canvas(*bitmap);
-    // TODO (msarett): Maybe we can take advantage of the fact that SkRect uses floats?
-    SkRect src = SkRect::MakeXYWH((SkScalar) subset.x(), (SkScalar) 0,
-            (SkScalar) subset.width(), (SkScalar) subset.height());
-    SkRect dst = SkRect::MakeXYWH((SkScalar) (outX / sampleSize), (SkScalar) (outY / sampleSize),
-            (SkScalar) get_scaled_dimension(subset.width(), sampleSize),
-            (SkScalar) get_scaled_dimension(subset.height(), sampleSize));
-    SkPaint paint;
-    // Overwrite the dst with the src pixels
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
-    // TODO (msarett): Test multiple filter qualities.  kNone is the default.
-    canvas.drawBitmapRect(tmp, src, dst, &paint);
-
-    return true;
-}
-
-bool SkBitmapRegionCanvas::conversionSupported(SkColorType colorType) {
-    // SkCanvas does not draw to these color types.
-    if (kIndex_8_SkColorType == colorType || kGray_8_SkColorType == colorType) {
-        return false;
-    }
-
-    // FIXME: Call virtual function when it lands.
-    SkImageInfo info = SkImageInfo::Make(0, 0, colorType, fDecoder->getInfo().alphaType(),
-            fDecoder->getInfo().profileType());
-    return conversion_possible(info, fDecoder->getInfo());
-}