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- /*
- * Copyright 2007 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 "src/core/SkMask.h"
- #include "include/private/SkMalloc.h"
- #include "include/private/SkTo.h"
- #include "src/core/SkSafeMath.h"
- /** returns the product if it is positive and fits in 31 bits. Otherwise this
- returns 0.
- */
- static int32_t safeMul32(int32_t a, int32_t b) {
- int64_t size = sk_64_mul(a, b);
- if (size > 0 && SkTFitsIn<int32_t>(size)) {
- return size;
- }
- return 0;
- }
- size_t SkMask::computeImageSize() const {
- return safeMul32(fBounds.height(), fRowBytes);
- }
- size_t SkMask::computeTotalImageSize() const {
- size_t size = this->computeImageSize();
- if (fFormat == SkMask::k3D_Format) {
- size = safeMul32(SkToS32(size), 3);
- }
- return size;
- }
- /** We explicitly use this allocator for SkBimap pixels, so that we can
- freely assign memory allocated by one class to the other.
- */
- uint8_t* SkMask::AllocImage(size_t size, AllocType at) {
- size_t aligned_size = SkSafeMath::Align4(size);
- unsigned flags = SK_MALLOC_THROW;
- if (at == kZeroInit_Alloc) {
- flags |= SK_MALLOC_ZERO_INITIALIZE;
- }
- return static_cast<uint8_t*>(sk_malloc_flags(aligned_size, flags));
- }
- /** We explicitly use this allocator for SkBimap pixels, so that we can
- freely assign memory allocated by one class to the other.
- */
- void SkMask::FreeImage(void* image) {
- sk_free(image);
- }
- SkMask SkMask::PrepareDestination(int radiusX, int radiusY, const SkMask& src) {
- SkSafeMath safe;
- SkMask dst;
- // dstW = srcW + 2 * radiusX;
- size_t dstW = safe.add(src.fBounds.width(), safe.add(radiusX, radiusX));
- // dstH = srcH + 2 * radiusY;
- size_t dstH = safe.add(src.fBounds.height(), safe.add(radiusY, radiusY));
- if (!SkTFitsIn<int>(dstW) || !SkTFitsIn<int>(dstH)) {
- dst.fBounds.setEmpty();
- dst.fRowBytes = 0;
- } else {
- dst.fBounds.set(0, 0, SkTo<int>(dstW), SkTo<int>(dstH));
- dst.fBounds.offset(src.fBounds.x(), src.fBounds.y());
- dst.fBounds.offset(-radiusX, -radiusY);
- dst.fRowBytes = SkTo<uint32_t>(dstW);
- }
- dst.fImage = nullptr;
- dst.fFormat = SkMask::kA8_Format;
- size_t toAlloc = safe.mul(dstW, dstH);
- if (safe && src.fImage != nullptr) {
- dst.fImage = SkMask::AllocImage(toAlloc);
- }
- return dst;
- }
- ///////////////////////////////////////////////////////////////////////////////
- static const int gMaskFormatToShift[] = {
- ~0, // BW -- not supported
- 0, // A8
- 0, // 3D
- 2, // ARGB32
- 1, // LCD16
- 0, // SDF
- };
- static int maskFormatToShift(SkMask::Format format) {
- SkASSERT((unsigned)format < SK_ARRAY_COUNT(gMaskFormatToShift));
- SkASSERT(SkMask::kBW_Format != format);
- return gMaskFormatToShift[format];
- }
- void* SkMask::getAddr(int x, int y) const {
- SkASSERT(kBW_Format != fFormat);
- SkASSERT(fBounds.contains(x, y));
- SkASSERT(fImage);
- char* addr = (char*)fImage;
- addr += (y - fBounds.fTop) * fRowBytes;
- addr += (x - fBounds.fLeft) << maskFormatToShift(fFormat);
- return addr;
- }
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