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