| /* |
| * 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 "SkPixmap.h" |
| |
| #include "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkColorData.h" |
| #include "SkConvertPixels.h" |
| #include "SkData.h" |
| #include "SkHalf.h" |
| #include "SkImageInfoPriv.h" |
| #include "SkImageShader.h" |
| #include "SkMask.h" |
| #include "SkNx.h" |
| #include "SkPM4f.h" |
| #include "SkPixmapPriv.h" |
| #include "SkReadPixelsRec.h" |
| #include "SkSurface.h" |
| #include "SkTemplates.h" |
| #include "SkTo.h" |
| #include "SkUnPreMultiply.h" |
| #include "SkUtils.h" |
| |
| #include <utility> |
| |
| ///////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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(), |
| 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(); |
| |
| if (color == 0 |
| && width == this->rowBytesAsPixels() |
| && inArea == this->bounds()) { |
| // All formats represent SkColor(0) as byte 0. |
| memset(this->writable_addr(), 0, (int64_t)height * rowBytes); |
| return true; |
| } |
| |
| 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 kRGB_888x_SkColorType: |
| a = 255; // then fallthrough to 8888 |
| case kRGBA_8888_SkColorType: |
| case kBGRA_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 = kBGRA_8888_SkColorType == this->colorType() |
| ? SkPackARGB_as_BGRA(a, r, g, b) // bgra 8888 |
| : SkPackARGB_as_RGBA(a, r, g, b); // rgba 8888 or rgb 888 |
| |
| while (--height >= 0) { |
| sk_memset32(p, v, width); |
| p = (uint32_t*)((char*)p + rowBytes); |
| } |
| break; |
| } |
| |
| case kRGB_101010x_SkColorType: |
| a = 255; // then fallthrough to 1010102 |
| case kRGBA_1010102_SkColorType: { |
| uint32_t* p = this->writable_addr32(area.fLeft, area.fTop); |
| |
| float R = r * (1/255.0f), |
| G = g * (1/255.0f), |
| B = b * (1/255.0f), |
| A = a * (1/255.0f); |
| if (a != 255 && this->alphaType() == kPremul_SkAlphaType) { |
| R *= A; |
| G *= A; |
| B *= A; |
| } |
| uint32_t v = (uint32_t)(R * 1023.0f) << 0 |
| | (uint32_t)(G * 1023.0f) << 10 |
| | (uint32_t)(B * 1023.0f) << 20 |
| | (uint32_t)(A * 3.0f) << 30; |
| 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& actualDst, SkFilterQuality quality) const { |
| // We may need to tweak how we interpret these just a little below, so we make copies. |
| SkPixmap src = *this, |
| dst = actualDst; |
| |
| // Can't do anthing with empty src or dst |
| if (src.width() <= 0 || src.height() <= 0 || |
| dst.width() <= 0 || dst.height() <= 0) { |
| return false; |
| } |
| |
| // no scaling involved? |
| if (src.width() == dst.width() && src.height() == dst.height()) { |
| return src.readPixels(dst); |
| } |
| |
| // If src and dst are both unpremul, we'll fake them out to appear as if premul. |
| bool clampAsIfUnpremul = false; |
| if (src.alphaType() == kUnpremul_SkAlphaType && |
| dst.alphaType() == kUnpremul_SkAlphaType) { |
| src.reset(src.info().makeAlphaType(kPremul_SkAlphaType), src.addr(), src.rowBytes()); |
| dst.reset(dst.info().makeAlphaType(kPremul_SkAlphaType), dst.addr(), dst.rowBytes()); |
| |
| // In turn, we'll need to tell the image shader to clamp to [0,1] instead |
| // of the usual [0,a] when using a bicubic scaling (kHigh_SkFilterQuality) |
| // or a gamut transformation. |
| clampAsIfUnpremul = true; |
| } |
| |
| SkBitmap bitmap; |
| if (!bitmap.installPixels(src)) { |
| return false; |
| } |
| bitmap.setImmutable(); // Don't copy when we create an image. |
| bitmap.setIsVolatile(true); // Disable any caching. |
| |
| SkMatrix scale = SkMatrix::MakeRectToRect(SkRect::Make(src.bounds()), |
| SkRect::Make(dst.bounds()), |
| SkMatrix::kFill_ScaleToFit); |
| |
| // We'll create a shader to do this draw so we have control over the bicubic clamp. |
| sk_sp<SkShader> shader = SkImageShader::Make(SkImage::MakeFromBitmap(bitmap), |
| SkShader::kClamp_TileMode, |
| SkShader::kClamp_TileMode, |
| &scale, |
| clampAsIfUnpremul); |
| |
| sk_sp<SkSurface> surface = SkSurface::MakeRasterDirect(dst.info(), |
| dst.writable_addr(), |
| dst.rowBytes()); |
| if (!shader || !surface) { |
| return false; |
| } |
| |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kSrc); |
| paint.setFilterQuality(quality); |
| paint.setShader(std::move(shader)); |
| surface->getCanvas()->drawPaint(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 kRGB_888x_SkColorType: { |
| uint32_t value = *this->addr32(x, y); |
| return SkSwizzle_RB(value | 0xff000000); |
| } |
| 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 kRGB_101010x_SkColorType: { |
| uint32_t value = *this->addr32(x, y); |
| // Convert 10-bit rgb to 8-bit bgr, and mask in 0xff alpha at the top. |
| return (uint32_t)( ((value >> 0) & 0x3ff) * (255/1023.0f) ) << 16 |
| | (uint32_t)( ((value >> 10) & 0x3ff) * (255/1023.0f) ) << 8 |
| | (uint32_t)( ((value >> 20) & 0x3ff) * (255/1023.0f) ) << 0 |
| | 0xff000000; |
| } |
| case kRGBA_1010102_SkColorType: { |
| uint32_t value = *this->addr32(x, y); |
| |
| float r = ((value >> 0) & 0x3ff) * (1/1023.0f), |
| g = ((value >> 10) & 0x3ff) * (1/1023.0f), |
| b = ((value >> 20) & 0x3ff) * (1/1023.0f), |
| a = ((value >> 30) & 0x3 ) * (1/ 3.0f); |
| if (a != 0 && needsUnpremul) { |
| r *= (1.0f/a); |
| g *= (1.0f/a); |
| b *= (1.0f/a); |
| } |
| return (uint32_t)( r * 255.0f ) << 16 |
| | (uint32_t)( g * 255.0f ) << 8 |
| | (uint32_t)( b * 255.0f ) << 0 |
| | (uint32_t)( a * 255.0f ) << 24; |
| } |
| 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; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static bool draw_orientation(const SkPixmap& dst, const SkPixmap& src, unsigned flags) { |
| auto surf = SkSurface::MakeRasterDirect(dst.info(), dst.writable_addr(), dst.rowBytes()); |
| if (!surf) { |
| return false; |
| } |
| |
| SkBitmap bm; |
| bm.installPixels(src); |
| |
| SkMatrix m; |
| m.setIdentity(); |
| |
| SkScalar W = SkIntToScalar(src.width()); |
| SkScalar H = SkIntToScalar(src.height()); |
| if (flags & SkPixmapPriv::kSwapXY) { |
| SkMatrix s; |
| s.setAll(0, 1, 0, 1, 0, 0, 0, 0, 1); |
| m.postConcat(s); |
| using std::swap; |
| swap(W, H); |
| } |
| if (flags & SkPixmapPriv::kMirrorX) { |
| m.postScale(-1, 1); |
| m.postTranslate(W, 0); |
| } |
| if (flags & SkPixmapPriv::kMirrorY) { |
| m.postScale(1, -1); |
| m.postTranslate(0, H); |
| } |
| SkPaint p; |
| p.setBlendMode(SkBlendMode::kSrc); |
| surf->getCanvas()->concat(m); |
| surf->getCanvas()->drawBitmap(bm, 0, 0, &p); |
| return true; |
| } |
| |
| bool SkPixmapPriv::Orient(const SkPixmap& dst, const SkPixmap& src, OrientFlags flags) { |
| SkASSERT((flags & ~(kMirrorX | kMirrorY | kSwapXY)) == 0); |
| if (src.colorType() != dst.colorType()) { |
| return false; |
| } |
| // note: we just ignore alphaType and colorSpace for this transformation |
| |
| int w = src.width(); |
| int h = src.height(); |
| if (flags & kSwapXY) { |
| using std::swap; |
| swap(w, h); |
| } |
| if (dst.width() != w || dst.height() != h) { |
| return false; |
| } |
| if (w == 0 || h == 0) { |
| return true; |
| } |
| |
| // check for aliasing to self |
| if (src.addr() == dst.addr()) { |
| return flags == 0; |
| } |
| return draw_orientation(dst, src, flags); |
| } |
| |
| #define kMirrorX SkPixmapPriv::kMirrorX |
| #define kMirrorY SkPixmapPriv::kMirrorY |
| #define kSwapXY SkPixmapPriv::kSwapXY |
| |
| static constexpr uint8_t gOrientationFlags[] = { |
| 0, // kTopLeft_SkEncodedOrigin |
| kMirrorX, // kTopRight_SkEncodedOrigin |
| kMirrorX | kMirrorY, // kBottomRight_SkEncodedOrigin |
| kMirrorY, // kBottomLeft_SkEncodedOrigin |
| kSwapXY, // kLeftTop_SkEncodedOrigin |
| kMirrorX | kSwapXY, // kRightTop_SkEncodedOrigin |
| kMirrorX | kMirrorY | kSwapXY, // kRightBottom_SkEncodedOrigin |
| kMirrorY | kSwapXY, // kLeftBottom_SkEncodedOrigin |
| }; |
| |
| SkPixmapPriv::OrientFlags SkPixmapPriv::OriginToOrient(SkEncodedOrigin o) { |
| unsigned io = static_cast<int>(o) - 1; |
| SkASSERT(io < SK_ARRAY_COUNT(gOrientationFlags)); |
| return static_cast<SkPixmapPriv::OrientFlags>(gOrientationFlags[io]); |
| } |
| |
| bool SkPixmapPriv::ShouldSwapWidthHeight(SkEncodedOrigin o) { |
| return SkToBool(OriginToOrient(o) & kSwapXY); |
| } |
| |
| SkImageInfo SkPixmapPriv::SwapWidthHeight(const SkImageInfo& info) { |
| return info.makeWH(info.height(), info.width()); |
| } |
| |
