| /* |
| * Copyright 2012 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkMergeImageFilter.h" |
| #include "SkCanvas.h" |
| #include "SkDevice.h" |
| #include "SkFlattenableBuffers.h" |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkMergeImageFilter::initAllocModes() { |
| int inputCount = countInputs(); |
| if (inputCount) { |
| size_t size = sizeof(uint8_t) * inputCount; |
| if (size <= sizeof(fStorage)) { |
| fModes = SkTCast<uint8_t*>(fStorage); |
| } else { |
| fModes = SkTCast<uint8_t*>(sk_malloc_throw(size)); |
| } |
| } else { |
| fModes = NULL; |
| } |
| } |
| |
| void SkMergeImageFilter::initModes(const SkXfermode::Mode modes[]) { |
| if (modes) { |
| this->initAllocModes(); |
| int inputCount = countInputs(); |
| for (int i = 0; i < inputCount; ++i) { |
| fModes[i] = SkToU8(modes[i]); |
| } |
| } else { |
| fModes = NULL; |
| } |
| } |
| |
| SkMergeImageFilter::SkMergeImageFilter(SkImageFilter* first, SkImageFilter* second, |
| SkXfermode::Mode mode) : INHERITED(first, second) { |
| if (SkXfermode::kSrcOver_Mode != mode) { |
| SkXfermode::Mode modes[] = { mode, mode }; |
| this->initModes(modes); |
| } else { |
| fModes = NULL; |
| } |
| } |
| |
| SkMergeImageFilter::SkMergeImageFilter(SkImageFilter* filters[], int count, |
| const SkXfermode::Mode modes[]) : INHERITED(count, filters) { |
| this->initModes(modes); |
| } |
| |
| SkMergeImageFilter::~SkMergeImageFilter() { |
| |
| if (fModes != SkTCast<uint8_t*>(fStorage)) { |
| sk_free(fModes); |
| } |
| } |
| |
| bool SkMergeImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| SkIRect* dst) { |
| if (countInputs() < 1) { |
| return false; |
| } |
| |
| SkIRect totalBounds; |
| |
| int inputCount = countInputs(); |
| for (int i = 0; i < inputCount; ++i) { |
| SkImageFilter* filter = getInput(i); |
| SkIRect r; |
| if (filter) { |
| if (!filter->filterBounds(src, ctm, &r)) { |
| return false; |
| } |
| } else { |
| r = src; |
| } |
| if (0 == i) { |
| totalBounds = r; |
| } else { |
| totalBounds.join(r); |
| } |
| } |
| |
| // don't modify dst until now, so we don't accidentally change it in the |
| // loop, but then return false on the next filter. |
| *dst = totalBounds; |
| return true; |
| } |
| |
| bool SkMergeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, |
| const SkMatrix& ctm, |
| SkBitmap* result, SkIPoint* loc) { |
| if (countInputs() < 1) { |
| return false; |
| } |
| |
| const SkIRect srcBounds = SkIRect::MakeXYWH(loc->x(), loc->y(), |
| src.width(), src.height()); |
| SkIRect bounds; |
| if (!this->filterBounds(srcBounds, ctm, &bounds)) { |
| return false; |
| } |
| |
| const int x0 = bounds.left(); |
| const int y0 = bounds.top(); |
| |
| SkAutoTUnref<SkDevice> dst(proxy->createDevice(bounds.width(), bounds.height())); |
| if (NULL == dst) { |
| return false; |
| } |
| SkCanvas canvas(dst); |
| SkPaint paint; |
| |
| int inputCount = countInputs(); |
| for (int i = 0; i < inputCount; ++i) { |
| SkBitmap tmp; |
| const SkBitmap* srcPtr; |
| SkIPoint pos = *loc; |
| SkImageFilter* filter = getInput(i); |
| if (filter) { |
| if (!filter->filterImage(proxy, src, ctm, &tmp, &pos)) { |
| return false; |
| } |
| srcPtr = &tmp; |
| } else { |
| srcPtr = &src; |
| } |
| |
| if (fModes) { |
| paint.setXfermodeMode((SkXfermode::Mode)fModes[i]); |
| } else { |
| paint.setXfermode(NULL); |
| } |
| canvas.drawSprite(*srcPtr, pos.x() - x0, pos.y() - y0, &paint); |
| } |
| |
| loc->set(bounds.left(), bounds.top()); |
| *result = dst->accessBitmap(false); |
| return true; |
| } |
| |
| void SkMergeImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| |
| buffer.writeBool(fModes != NULL); |
| if (fModes) { |
| buffer.writeByteArray(fModes, countInputs() * sizeof(fModes[0])); |
| } |
| } |
| |
| SkMergeImageFilter::SkMergeImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| bool hasModes = buffer.readBool(); |
| if (hasModes) { |
| this->initAllocModes(); |
| SkASSERT(buffer.getArrayCount() == countInputs() * sizeof(fModes[0])); |
| buffer.readByteArray(fModes); |
| } else { |
| fModes = 0; |
| } |
| } |