| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkColorPriv.h" |
| #include "SkConvertPixels.h" |
| #include "SkData.h" |
| #include "SkImageInfoPriv.h" |
| #include "SkHalf.h" |
| #include "SkMask.h" |
| #include "SkNx.h" |
| #include "SkPM4f.h" |
| #include "SkPixmap.h" |
| #include "SkReadPixelsRec.h" |
| #include "SkSurface.h" |
| #include "SkUtils.h" |
| |
| ///////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPixmap::reset() { |
| fPixels = nullptr; |
| fRowBytes = 0; |
| fInfo = SkImageInfo::MakeUnknown(); |
| } |
| |
| void SkPixmap::reset(const SkImageInfo& info, const void* addr, size_t rowBytes) { |
| if (addr) { |
| SkASSERT(info.validRowBytes(rowBytes)); |
| } |
| fPixels = addr; |
| fRowBytes = rowBytes; |
| fInfo = info; |
| } |
| |
| bool SkPixmap::reset(const SkMask& src) { |
| if (SkMask::kA8_Format == src.fFormat) { |
| this->reset(SkImageInfo::MakeA8(src.fBounds.width(), src.fBounds.height()), |
| src.fImage, src.fRowBytes); |
| return true; |
| } |
| this->reset(); |
| return false; |
| } |
| |
| void SkPixmap::setColorSpace(sk_sp<SkColorSpace> cs) { |
| fInfo = fInfo.makeColorSpace(std::move(cs)); |
| } |
| |
| bool SkPixmap::extractSubset(SkPixmap* result, const SkIRect& subset) const { |
| SkIRect srcRect, r; |
| srcRect.set(0, 0, this->width(), this->height()); |
| if (!r.intersect(srcRect, subset)) { |
| return false; // r is empty (i.e. no intersection) |
| } |
| |
| // If the upper left of the rectangle was outside the bounds of this SkBitmap, we should have |
| // exited above. |
| SkASSERT(static_cast<unsigned>(r.fLeft) < static_cast<unsigned>(this->width())); |
| SkASSERT(static_cast<unsigned>(r.fTop) < static_cast<unsigned>(this->height())); |
| |
| const void* pixels = nullptr; |
| if (fPixels) { |
| const size_t bpp = fInfo.bytesPerPixel(); |
| pixels = (const uint8_t*)fPixels + r.fTop * fRowBytes + r.fLeft * bpp; |
| } |
| result->reset(fInfo.makeWH(r.width(), r.height()), pixels, fRowBytes); |
| return true; |
| } |
| |
| bool SkPixmap::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB, int x, int y, |
| SkTransferFunctionBehavior behavior) const { |
| if (!SkImageInfoValidConversion(dstInfo, fInfo)) { |
| return false; |
| } |
| |
| SkReadPixelsRec rec(dstInfo, dstPixels, dstRB, x, y); |
| if (!rec.trim(fInfo.width(), fInfo.height())) { |
| return false; |
| } |
| |
| const void* srcPixels = this->addr(rec.fX, rec.fY); |
| const SkImageInfo srcInfo = fInfo.makeWH(rec.fInfo.width(), rec.fInfo.height()); |
| SkConvertPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, srcInfo, srcPixels, this->rowBytes(), |
| nullptr, behavior); |
| return true; |
| } |
| |
| static uint16_t pack_8888_to_4444(unsigned a, unsigned r, unsigned g, unsigned b) { |
| unsigned pixel = (SkA32To4444(a) << SK_A4444_SHIFT) | |
| (SkR32To4444(r) << SK_R4444_SHIFT) | |
| (SkG32To4444(g) << SK_G4444_SHIFT) | |
| (SkB32To4444(b) << SK_B4444_SHIFT); |
| return SkToU16(pixel); |
| } |
| |
| bool SkPixmap::erase(SkColor color, const SkIRect& inArea) const { |
| if (nullptr == fPixels) { |
| return false; |
| } |
| SkIRect area; |
| if (!area.intersect(this->bounds(), inArea)) { |
| return false; |
| } |
| |
| U8CPU a = SkColorGetA(color); |
| U8CPU r = SkColorGetR(color); |
| U8CPU g = SkColorGetG(color); |
| U8CPU b = SkColorGetB(color); |
| |
| int height = area.height(); |
| const int width = area.width(); |
| const int rowBytes = this->rowBytes(); |
| |
| switch (this->colorType()) { |
| case kGray_8_SkColorType: { |
| if (255 != a) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| int gray = SkComputeLuminance(r, g, b); |
| uint8_t* p = this->writable_addr8(area.fLeft, area.fTop); |
| while (--height >= 0) { |
| memset(p, gray, width); |
| p += rowBytes; |
| } |
| break; |
| } |
| case kAlpha_8_SkColorType: { |
| uint8_t* p = this->writable_addr8(area.fLeft, area.fTop); |
| while (--height >= 0) { |
| memset(p, a, width); |
| p += rowBytes; |
| } |
| break; |
| } |
| case kARGB_4444_SkColorType: |
| case kRGB_565_SkColorType: { |
| uint16_t* p = this->writable_addr16(area.fLeft, area.fTop); |
| uint16_t v; |
| |
| // make rgb premultiplied |
| if (255 != a) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| |
| if (kARGB_4444_SkColorType == this->colorType()) { |
| v = pack_8888_to_4444(a, r, g, b); |
| } else { |
| v = SkPackRGB16(r >> (8 - SK_R16_BITS), |
| g >> (8 - SK_G16_BITS), |
| b >> (8 - SK_B16_BITS)); |
| } |
| while (--height >= 0) { |
| sk_memset16(p, v, width); |
| p = (uint16_t*)((char*)p + rowBytes); |
| } |
| break; |
| } |
| case kBGRA_8888_SkColorType: |
| case kRGBA_8888_SkColorType: { |
| uint32_t* p = this->writable_addr32(area.fLeft, area.fTop); |
| |
| if (255 != a && kPremul_SkAlphaType == this->alphaType()) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| uint32_t v = kRGBA_8888_SkColorType == this->colorType() |
| ? SkPackARGB_as_RGBA(a, r, g, b) |
| : SkPackARGB_as_BGRA(a, r, g, b); |
| |
| while (--height >= 0) { |
| sk_memset32(p, v, width); |
| p = (uint32_t*)((char*)p + rowBytes); |
| } |
| break; |
| } |
| case kRGBA_F16_SkColorType: |
| // The colorspace is unspecified, so assume linear just like getColor(). |
| this->erase(SkColor4f{(1 / 255.0f) * r, |
| (1 / 255.0f) * g, |
| (1 / 255.0f) * b, |
| (1 / 255.0f) * a}, &area); |
| break; |
| default: |
| return false; // no change, so don't call notifyPixelsChanged() |
| } |
| return true; |
| } |
| |
| bool SkPixmap::erase(const SkColor4f& origColor, const SkIRect* subset) const { |
| SkPixmap pm; |
| if (subset) { |
| if (!this->extractSubset(&pm, *subset)) { |
| return false; |
| } |
| } else { |
| pm = *this; |
| } |
| |
| const SkColor4f color = origColor.pin(); |
| |
| if (kRGBA_F16_SkColorType != pm.colorType()) { |
| return pm.erase(color.toSkColor()); |
| } |
| |
| const uint64_t half4 = color.premul().toF16(); |
| for (int y = 0; y < pm.height(); ++y) { |
| sk_memset64(pm.writable_addr64(0, y), half4, pm.width()); |
| } |
| return true; |
| } |
| |
| bool SkPixmap::scalePixels(const SkPixmap& dst, SkFilterQuality quality) const { |
| // Can't do anthing with empty src or dst |
| if (this->width() <= 0 || this->height() <= 0 || dst.width() <= 0 || dst.height() <= 0) { |
| return false; |
| } |
| |
| // no scaling involved? |
| if (dst.width() == this->width() && dst.height() == this->height()) { |
| return this->readPixels(dst); |
| } |
| |
| SkBitmap bitmap; |
| if (!bitmap.installPixels(*this)) { |
| return false; |
| } |
| bitmap.setIsVolatile(true); // so we don't try to cache it |
| |
| auto surface(SkSurface::MakeRasterDirect(dst.info(), dst.writable_addr(), dst.rowBytes())); |
| if (!surface) { |
| return false; |
| } |
| |
| SkPaint paint; |
| paint.setFilterQuality(quality); |
| paint.setBlendMode(SkBlendMode::kSrc); |
| surface->getCanvas()->drawBitmapRect(bitmap, SkRect::MakeIWH(dst.width(), dst.height()), |
| &paint); |
| return true; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkColor SkPixmap::getColor(int x, int y) const { |
| SkASSERT(this->addr()); |
| SkASSERT((unsigned)x < (unsigned)this->width()); |
| SkASSERT((unsigned)y < (unsigned)this->height()); |
| |
| const bool needsUnpremul = (kPremul_SkAlphaType == fInfo.alphaType()); |
| auto toColor = [needsUnpremul](uint32_t maybePremulColor) { |
| return needsUnpremul ? SkUnPreMultiply::PMColorToColor(maybePremulColor) |
| : SkSwizzle_BGRA_to_PMColor(maybePremulColor); |
| }; |
| |
| switch (this->colorType()) { |
| case kGray_8_SkColorType: { |
| uint8_t value = *this->addr8(x, y); |
| return SkColorSetRGB(value, value, value); |
| } |
| case kAlpha_8_SkColorType: { |
| return SkColorSetA(0, *this->addr8(x, y)); |
| } |
| case kRGB_565_SkColorType: { |
| return SkPixel16ToColor(*this->addr16(x, y)); |
| } |
| case kARGB_4444_SkColorType: { |
| uint16_t value = *this->addr16(x, y); |
| SkPMColor c = SkPixel4444ToPixel32(value); |
| return toColor(c); |
| } |
| case kBGRA_8888_SkColorType: { |
| uint32_t value = *this->addr32(x, y); |
| SkPMColor c = SkSwizzle_BGRA_to_PMColor(value); |
| return toColor(c); |
| } |
| case kRGBA_8888_SkColorType: { |
| uint32_t value = *this->addr32(x, y); |
| SkPMColor c = SkSwizzle_RGBA_to_PMColor(value); |
| return toColor(c); |
| } |
| case kRGBA_F16_SkColorType: { |
| const uint64_t* addr = |
| (const uint64_t*)fPixels + y * (fRowBytes >> 3) + x; |
| Sk4f p4 = SkHalfToFloat_finite_ftz(*addr); |
| if (p4[3] && needsUnpremul) { |
| float inva = 1 / p4[3]; |
| p4 = p4 * Sk4f(inva, inva, inva, 1); |
| } |
| SkColor c; |
| SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c); |
| // p4 is RGBA, but we want BGRA, so we need to swap next |
| return SkSwizzle_RB(c); |
| } |
| default: |
| SkDEBUGFAIL(""); |
| return SkColorSetARGB(0, 0, 0, 0); |
| } |
| } |
| |
| bool SkPixmap::computeIsOpaque() const { |
| const int height = this->height(); |
| const int width = this->width(); |
| |
| switch (this->colorType()) { |
| case kAlpha_8_SkColorType: { |
| unsigned a = 0xFF; |
| for (int y = 0; y < height; ++y) { |
| const uint8_t* row = this->addr8(0, y); |
| for (int x = 0; x < width; ++x) { |
| a &= row[x]; |
| } |
| if (0xFF != a) { |
| return false; |
| } |
| } |
| return true; |
| } break; |
| case kRGB_565_SkColorType: |
| case kGray_8_SkColorType: |
| return true; |
| break; |
| case kARGB_4444_SkColorType: { |
| unsigned c = 0xFFFF; |
| for (int y = 0; y < height; ++y) { |
| const SkPMColor16* row = this->addr16(0, y); |
| for (int x = 0; x < width; ++x) { |
| c &= row[x]; |
| } |
| if (0xF != SkGetPackedA4444(c)) { |
| return false; |
| } |
| } |
| return true; |
| } break; |
| case kBGRA_8888_SkColorType: |
| case kRGBA_8888_SkColorType: { |
| SkPMColor c = (SkPMColor)~0; |
| for (int y = 0; y < height; ++y) { |
| const SkPMColor* row = this->addr32(0, y); |
| for (int x = 0; x < width; ++x) { |
| c &= row[x]; |
| } |
| if (0xFF != SkGetPackedA32(c)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| case kRGBA_F16_SkColorType: { |
| const SkHalf* row = (const SkHalf*)this->addr(); |
| for (int y = 0; y < height; ++y) { |
| for (int x = 0; x < width; ++x) { |
| if (row[4 * x + 3] < SK_Half1) { |
| return false; |
| } |
| } |
| row += this->rowBytes() >> 1; |
| } |
| return true; |
| } |
| default: |
| break; |
| } |
| return false; |
| } |
