87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
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* Copyright 2007 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkMask.h"
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//#define TRACK_SKMASK_LIFETIME
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/** returns the product if it is positive and fits in 31 bits. Otherwise this
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returns 0.
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*/
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static int32_t safeMul32(int32_t a, int32_t b) {
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int64_t size = sk_64_mul(a, b);
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if (size > 0 && sk_64_isS32(size)) {
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return sk_64_asS32(size);
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}
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return 0;
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}
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size_t SkMask::computeImageSize() const {
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return safeMul32(fBounds.height(), fRowBytes);
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}
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size_t SkMask::computeTotalImageSize() const {
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size_t size = this->computeImageSize();
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if (fFormat == SkMask::k3D_Format) {
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size = safeMul32(SkToS32(size), 3);
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}
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return size;
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}
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#ifdef TRACK_SKMASK_LIFETIME
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static int gCounter;
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#endif
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/** We explicitly use this allocator for SkBimap pixels, so that we can
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freely assign memory allocated by one class to the other.
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*/
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uint8_t* SkMask::AllocImage(size_t size) {
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#ifdef TRACK_SKMASK_LIFETIME
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SkDebugf("SkMask::AllocImage %d\n", gCounter++);
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#endif
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return (uint8_t*)sk_malloc_throw(SkAlign4(size));
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}
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/** We explicitly use this allocator for SkBimap pixels, so that we can
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freely assign memory allocated by one class to the other.
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*/
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void SkMask::FreeImage(void* image) {
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#ifdef TRACK_SKMASK_LIFETIME
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if (image) {
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SkDebugf("SkMask::FreeImage %d\n", --gCounter);
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}
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#endif
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sk_free(image);
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}
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///////////////////////////////////////////////////////////////////////////////
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static const int gMaskFormatToShift[] = {
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~0, // BW -- not supported
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0, // A8
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0, // 3D
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2, // ARGB32
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1, // LCD16
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};
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static int maskFormatToShift(SkMask::Format format) {
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SkASSERT((unsigned)format < SK_ARRAY_COUNT(gMaskFormatToShift));
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SkASSERT(SkMask::kBW_Format != format);
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return gMaskFormatToShift[format];
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}
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void* SkMask::getAddr(int x, int y) const {
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SkASSERT(kBW_Format != fFormat);
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SkASSERT(fBounds.contains(x, y));
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SkASSERT(fImage);
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char* addr = (char*)fImage;
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addr += (y - fBounds.fTop) * fRowBytes;
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addr += (x - fBounds.fLeft) << maskFormatToShift(fFormat);
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return addr;
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}
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