/*
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* Copyright 2010 Google Inc.
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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 "SkImageInfoPriv.h"
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#include "SkSafeMath.h"
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#include "SkReadBuffer.h"
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#include "SkWriteBuffer.h"
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int SkColorTypeBytesPerPixel(SkColorType ct) {
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switch (ct) {
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case kUnknown_SkColorType: return 0;
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case kAlpha_8_SkColorType: return 1;
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case kRGB_565_SkColorType: return 2;
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case kARGB_4444_SkColorType: return 2;
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case kRGBA_8888_SkColorType: return 4;
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case kBGRA_8888_SkColorType: return 4;
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case kRGB_888x_SkColorType: return 4;
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case kRGBA_1010102_SkColorType: return 4;
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case kRGB_101010x_SkColorType: return 4;
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case kGray_8_SkColorType: return 1;
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case kRGBA_F16Norm_SkColorType: return 8;
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case kRGBA_F16_SkColorType: return 8;
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case kRGBA_F32_SkColorType: return 16;
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}
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return 0;
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}
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bool SkColorTypeIsAlwaysOpaque(SkColorType ct) {
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return !(kAlpha_SkColorTypeComponentFlag & SkColorTypeComponentFlags(ct));
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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int SkImageInfo::bytesPerPixel() const { return SkColorTypeBytesPerPixel(fColorType); }
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int SkImageInfo::shiftPerPixel() const { return SkColorTypeShiftPerPixel(fColorType); }
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size_t SkImageInfo::computeOffset(int x, int y, size_t rowBytes) const {
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SkASSERT((unsigned)x < (unsigned)this->width());
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SkASSERT((unsigned)y < (unsigned)this->height());
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return SkColorTypeComputeOffset(this->colorType(), x, y, rowBytes);
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}
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size_t SkImageInfo::computeByteSize(size_t rowBytes) const {
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if (0 == this->height()) {
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return 0;
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}
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SkSafeMath safe;
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size_t bytes = safe.add(safe.mul(safe.addInt(this->height(), -1), rowBytes),
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safe.mul(this->width(), this->bytesPerPixel()));
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return safe ? bytes : SIZE_MAX;
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}
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SkImageInfo SkImageInfo::MakeS32(int width, int height, SkAlphaType at) {
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return SkImageInfo(width, height, kN32_SkColorType, at,
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SkColorSpace::MakeSRGB());
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}
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bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
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SkAlphaType* canonical) {
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switch (colorType) {
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case kUnknown_SkColorType:
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alphaType = kUnknown_SkAlphaType;
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break;
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case kAlpha_8_SkColorType:
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if (kUnpremul_SkAlphaType == alphaType) {
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alphaType = kPremul_SkAlphaType;
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}
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// fall-through
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case kARGB_4444_SkColorType:
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case kRGBA_8888_SkColorType:
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case kBGRA_8888_SkColorType:
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case kRGBA_1010102_SkColorType:
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case kRGBA_F16Norm_SkColorType:
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case kRGBA_F16_SkColorType:
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case kRGBA_F32_SkColorType:
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if (kUnknown_SkAlphaType == alphaType) {
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return false;
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}
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break;
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case kGray_8_SkColorType:
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case kRGB_565_SkColorType:
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case kRGB_888x_SkColorType:
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case kRGB_101010x_SkColorType:
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alphaType = kOpaque_SkAlphaType;
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break;
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default:
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return false;
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}
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if (canonical) {
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*canonical = alphaType;
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}
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return true;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include "SkReadPixelsRec.h"
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bool SkReadPixelsRec::trim(int srcWidth, int srcHeight) {
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if (nullptr == fPixels || fRowBytes < fInfo.minRowBytes()) {
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return false;
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}
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if (0 >= fInfo.width() || 0 >= fInfo.height()) {
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return false;
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}
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int x = fX;
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int y = fY;
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SkIRect srcR = SkIRect::MakeXYWH(x, y, fInfo.width(), fInfo.height());
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if (!srcR.intersect(0, 0, srcWidth, srcHeight)) {
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return false;
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}
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// if x or y are negative, then we have to adjust pixels
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if (x > 0) {
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x = 0;
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}
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if (y > 0) {
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y = 0;
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}
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// here x,y are either 0 or negative
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// we negate and add them so UBSAN (pointer-overflow) doesn't get confused.
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fPixels = ((char*)fPixels + -y*fRowBytes + -x*fInfo.bytesPerPixel());
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// the intersect may have shrunk info's logical size
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fInfo = fInfo.makeWH(srcR.width(), srcR.height());
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fX = srcR.x();
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fY = srcR.y();
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return true;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include "SkWritePixelsRec.h"
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bool SkWritePixelsRec::trim(int dstWidth, int dstHeight) {
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if (nullptr == fPixels || fRowBytes < fInfo.minRowBytes()) {
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return false;
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}
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if (0 >= fInfo.width() || 0 >= fInfo.height()) {
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return false;
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}
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int x = fX;
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int y = fY;
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SkIRect dstR = SkIRect::MakeXYWH(x, y, fInfo.width(), fInfo.height());
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if (!dstR.intersect(0, 0, dstWidth, dstHeight)) {
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return false;
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}
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// if x or y are negative, then we have to adjust pixels
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if (x > 0) {
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x = 0;
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}
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if (y > 0) {
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y = 0;
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}
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// here x,y are either 0 or negative
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// we negate and add them so UBSAN (pointer-overflow) doesn't get confused.
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fPixels = ((const char*)fPixels + -y*fRowBytes + -x*fInfo.bytesPerPixel());
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// the intersect may have shrunk info's logical size
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fInfo = fInfo.makeWH(dstR.width(), dstR.height());
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fX = dstR.x();
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fY = dstR.y();
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return true;
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}
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