| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkPixmap_DEFINED |
| #define SkPixmap_DEFINED |
| |
| #include "include/core/SkColor.h" |
| #include "include/core/SkFilterQuality.h" |
| #include "include/core/SkImageInfo.h" |
| |
| class SkData; |
| struct SkMask; |
| |
| /** \class SkPixmap |
| SkPixmap provides a utility to pair SkImageInfo with pixels and row bytes. |
| SkPixmap is a low level class which provides convenience functions to access |
| raster destinations. SkCanvas can not draw SkPixmap, nor does SkPixmap provide |
| a direct drawing destination. |
| |
| Use SkBitmap to draw pixels referenced by SkPixmap; use SkSurface to draw into |
| pixels referenced by SkPixmap. |
| |
| SkPixmap does not try to manage the lifetime of the pixel memory. Use SkPixelRef |
| to manage pixel memory; SkPixelRef is safe across threads. |
| */ |
| class SK_API SkPixmap { |
| public: |
| |
| /** Creates an empty SkPixmap without pixels, with kUnknown_SkColorType, with |
| kUnknown_SkAlphaType, and with a width and height of zero. Use |
| reset() to associate pixels, SkColorType, SkAlphaType, width, and height |
| after SkPixmap has been created. |
| |
| @return empty SkPixmap |
| */ |
| SkPixmap() |
| : fPixels(nullptr), fRowBytes(0), fInfo(SkImageInfo::MakeUnknown(0, 0)) |
| {} |
| |
| /** Creates SkPixmap from info width, height, SkAlphaType, and SkColorType. |
| addr points to pixels, or nullptr. rowBytes should be info.width() times |
| info.bytesPerPixel(), or larger. |
| |
| No parameter checking is performed; it is up to the caller to ensure that |
| addr and rowBytes agree with info. |
| |
| The memory lifetime of pixels is managed by the caller. When SkPixmap goes |
| out of scope, addr is unaffected. |
| |
| SkPixmap may be later modified by reset() to change its size, pixel type, or |
| storage. |
| |
| @param info width, height, SkAlphaType, SkColorType of SkImageInfo |
| @param addr pointer to pixels allocated by caller; may be nullptr |
| @param rowBytes size of one row of addr; width times pixel size, or larger |
| @return initialized SkPixmap |
| */ |
| SkPixmap(const SkImageInfo& info, const void* addr, size_t rowBytes) |
| : fPixels(addr), fRowBytes(rowBytes), fInfo(info) |
| {} |
| |
| /** Sets width, height, row bytes to zero; pixel address to nullptr; SkColorType to |
| kUnknown_SkColorType; and SkAlphaType to kUnknown_SkAlphaType. |
| |
| The prior pixels are unaffected; it is up to the caller to release pixels |
| memory if desired. |
| |
| example: https://fiddle.skia.org/c/@Pixmap_reset |
| */ |
| void reset(); |
| |
| /** Sets width, height, SkAlphaType, and SkColorType from info. |
| Sets pixel address from addr, which may be nullptr. |
| Sets row bytes from rowBytes, which should be info.width() times |
| info.bytesPerPixel(), or larger. |
| |
| Does not check addr. Asserts if built with SK_DEBUG defined and if rowBytes is |
| too small to hold one row of pixels. |
| |
| The memory lifetime pixels are managed by the caller. When SkPixmap goes |
| out of scope, addr is unaffected. |
| |
| @param info width, height, SkAlphaType, SkColorType of SkImageInfo |
| @param addr pointer to pixels allocated by caller; may be nullptr |
| @param rowBytes size of one row of addr; width times pixel size, or larger |
| |
| example: https://fiddle.skia.org/c/@Pixmap_reset_2 |
| */ |
| void reset(const SkImageInfo& info, const void* addr, size_t rowBytes); |
| |
| /** Changes SkColorSpace in SkImageInfo; preserves width, height, SkAlphaType, and |
| SkColorType in SkImage, and leaves pixel address and row bytes unchanged. |
| SkColorSpace reference count is incremented. |
| |
| @param colorSpace SkColorSpace moved to SkImageInfo |
| |
| example: https://fiddle.skia.org/c/@Pixmap_setColorSpace |
| */ |
| void setColorSpace(sk_sp<SkColorSpace> colorSpace); |
| |
| /** Deprecated. |
| */ |
| bool SK_WARN_UNUSED_RESULT reset(const SkMask& mask); |
| |
| /** Sets subset width, height, pixel address to intersection of SkPixmap with area, |
| if intersection is not empty; and return true. Otherwise, leave subset unchanged |
| and return false. |
| |
| Failing to read the return value generates a compile time warning. |
| |
| @param subset storage for width, height, pixel address of intersection |
| @param area bounds to intersect with SkPixmap |
| @return true if intersection of SkPixmap and area is not empty |
| */ |
| bool SK_WARN_UNUSED_RESULT extractSubset(SkPixmap* subset, const SkIRect& area) const; |
| |
| /** Returns width, height, SkAlphaType, SkColorType, and SkColorSpace. |
| |
| @return reference to SkImageInfo |
| */ |
| const SkImageInfo& info() const { return fInfo; } |
| |
| /** Returns row bytes, the interval from one pixel row to the next. Row bytes |
| is at least as large as: width() * info().bytesPerPixel(). |
| |
| Returns zero if colorType() is kUnknown_SkColorType. |
| It is up to the SkBitmap creator to ensure that row bytes is a useful value. |
| |
| @return byte length of pixel row |
| */ |
| size_t rowBytes() const { return fRowBytes; } |
| |
| /** Returns pixel address, the base address corresponding to the pixel origin. |
| |
| It is up to the SkPixmap creator to ensure that pixel address is a useful value. |
| |
| @return pixel address |
| */ |
| const void* addr() const { return fPixels; } |
| |
| /** Returns pixel count in each pixel row. Should be equal or less than: |
| rowBytes() / info().bytesPerPixel(). |
| |
| @return pixel width in SkImageInfo |
| */ |
| int width() const { return fInfo.width(); } |
| |
| /** Returns pixel row count. |
| |
| @return pixel height in SkImageInfo |
| */ |
| int height() const { return fInfo.height(); } |
| |
| /** |
| * Return the dimensions of the pixmap (from its ImageInfo) |
| */ |
| SkISize dimensions() const { return fInfo.dimensions(); } |
| |
| SkColorType colorType() const { return fInfo.colorType(); } |
| |
| SkAlphaType alphaType() const { return fInfo.alphaType(); } |
| |
| /** Returns SkColorSpace, the range of colors, associated with SkImageInfo. The |
| reference count of SkColorSpace is unchanged. The returned SkColorSpace is |
| immutable. |
| |
| @return SkColorSpace in SkImageInfo, or nullptr |
| */ |
| SkColorSpace* colorSpace() const { return fInfo.colorSpace(); } |
| |
| /** Returns smart pointer to SkColorSpace, the range of colors, associated with |
| SkImageInfo. The smart pointer tracks the number of objects sharing this |
| SkColorSpace reference so the memory is released when the owners destruct. |
| |
| The returned SkColorSpace is immutable. |
| |
| @return SkColorSpace in SkImageInfo wrapped in a smart pointer |
| */ |
| sk_sp<SkColorSpace> refColorSpace() const { return fInfo.refColorSpace(); } |
| |
| /** Returns true if SkAlphaType is kOpaque_SkAlphaType. |
| Does not check if SkColorType allows alpha, or if any pixel value has |
| transparency. |
| |
| @return true if SkImageInfo has opaque SkAlphaType |
| */ |
| bool isOpaque() const { return fInfo.isOpaque(); } |
| |
| /** Returns SkIRect { 0, 0, width(), height() }. |
| |
| @return integral rectangle from origin to width() and height() |
| */ |
| SkIRect bounds() const { return SkIRect::MakeWH(this->width(), this->height()); } |
| |
| /** Returns number of pixels that fit on row. Should be greater than or equal to |
| width(). |
| |
| @return maximum pixels per row |
| */ |
| int rowBytesAsPixels() const { return int(fRowBytes >> this->shiftPerPixel()); } |
| |
| /** Returns bit shift converting row bytes to row pixels. |
| Returns zero for kUnknown_SkColorType. |
| |
| @return one of: 0, 1, 2, 3; left shift to convert pixels to bytes |
| */ |
| int shiftPerPixel() const { return fInfo.shiftPerPixel(); } |
| |
| /** Returns minimum memory required for pixel storage. |
| Does not include unused memory on last row when rowBytesAsPixels() exceeds width(). |
| Returns SIZE_MAX if result does not fit in size_t. |
| Returns zero if height() or width() is 0. |
| Returns height() times rowBytes() if colorType() is kUnknown_SkColorType. |
| |
| @return size in bytes of image buffer |
| */ |
| size_t computeByteSize() const { return fInfo.computeByteSize(fRowBytes); } |
| |
| /** Returns true if all pixels are opaque. SkColorType determines how pixels |
| are encoded, and whether pixel describes alpha. Returns true for SkColorType |
| without alpha in each pixel; for other SkColorType, returns true if all |
| pixels have alpha values equivalent to 1.0 or greater. |
| |
| For SkColorType kRGB_565_SkColorType or kGray_8_SkColorType: always |
| returns true. For SkColorType kAlpha_8_SkColorType, kBGRA_8888_SkColorType, |
| kRGBA_8888_SkColorType: returns true if all pixel alpha values are 255. |
| For SkColorType kARGB_4444_SkColorType: returns true if all pixel alpha values are 15. |
| For kRGBA_F16_SkColorType: returns true if all pixel alpha values are 1.0 or |
| greater. |
| |
| Returns false for kUnknown_SkColorType. |
| |
| @return true if all pixels have opaque values or SkColorType is opaque |
| |
| example: https://fiddle.skia.org/c/@Pixmap_computeIsOpaque |
| */ |
| bool computeIsOpaque() const; |
| |
| /** Returns pixel at (x, y) as unpremultiplied color. |
| Returns black with alpha if SkColorType is kAlpha_8_SkColorType. |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined; and returns undefined values or may crash if |
| SK_RELEASE is defined. Fails if SkColorType is kUnknown_SkColorType or |
| pixel address is nullptr. |
| |
| SkColorSpace in SkImageInfo is ignored. Some color precision may be lost in the |
| conversion to unpremultiplied color; original pixel data may have additional |
| precision. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return pixel converted to unpremultiplied color |
| |
| example: https://fiddle.skia.org/c/@Pixmap_getColor |
| */ |
| SkColor getColor(int x, int y) const; |
| |
| /** Look up the pixel at (x,y) and return its alpha component, normalized to [0..1]. |
| This is roughly equivalent to SkGetColorA(getColor()), but can be more efficent |
| (and more precise if the pixels store more than 8 bits per component). |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return alpha converted to normalized float |
| */ |
| float getAlphaf(int x, int y) const; |
| |
| /** Returns readable pixel address at (x, y). Returns nullptr if SkPixelRef is nullptr. |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. Returns nullptr if SkColorType is kUnknown_SkColorType. |
| |
| Performs a lookup of pixel size; for better performance, call |
| one of: addr8, addr16, addr32, addr64, or addrF16(). |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return readable generic pointer to pixel |
| */ |
| const void* addr(int x, int y) const { |
| return (const char*)fPixels + fInfo.computeOffset(x, y, fRowBytes); |
| } |
| |
| /** Returns readable base pixel address. Result is addressable as unsigned 8-bit bytes. |
| Will trigger an assert() if SkColorType is not kAlpha_8_SkColorType or |
| kGray_8_SkColorType, and is built with SK_DEBUG defined. |
| |
| One byte corresponds to one pixel. |
| |
| @return readable unsigned 8-bit pointer to pixels |
| */ |
| const uint8_t* addr8() const { |
| SkASSERT(1 == fInfo.bytesPerPixel()); |
| return reinterpret_cast<const uint8_t*>(fPixels); |
| } |
| |
| /** Returns readable base pixel address. Result is addressable as unsigned 16-bit words. |
| Will trigger an assert() if SkColorType is not kRGB_565_SkColorType or |
| kARGB_4444_SkColorType, and is built with SK_DEBUG defined. |
| |
| One word corresponds to one pixel. |
| |
| @return readable unsigned 16-bit pointer to pixels |
| */ |
| const uint16_t* addr16() const { |
| SkASSERT(2 == fInfo.bytesPerPixel()); |
| return reinterpret_cast<const uint16_t*>(fPixels); |
| } |
| |
| /** Returns readable base pixel address. Result is addressable as unsigned 32-bit words. |
| Will trigger an assert() if SkColorType is not kRGBA_8888_SkColorType or |
| kBGRA_8888_SkColorType, and is built with SK_DEBUG defined. |
| |
| One word corresponds to one pixel. |
| |
| @return readable unsigned 32-bit pointer to pixels |
| */ |
| const uint32_t* addr32() const { |
| SkASSERT(4 == fInfo.bytesPerPixel()); |
| return reinterpret_cast<const uint32_t*>(fPixels); |
| } |
| |
| /** Returns readable base pixel address. Result is addressable as unsigned 64-bit words. |
| Will trigger an assert() if SkColorType is not kRGBA_F16_SkColorType and is built |
| with SK_DEBUG defined. |
| |
| One word corresponds to one pixel. |
| |
| @return readable unsigned 64-bit pointer to pixels |
| */ |
| const uint64_t* addr64() const { |
| SkASSERT(8 == fInfo.bytesPerPixel()); |
| return reinterpret_cast<const uint64_t*>(fPixels); |
| } |
| |
| /** Returns readable base pixel address. Result is addressable as unsigned 16-bit words. |
| Will trigger an assert() if SkColorType is not kRGBA_F16_SkColorType and is built |
| with SK_DEBUG defined. |
| |
| Each word represents one color component encoded as a half float. |
| Four words correspond to one pixel. |
| |
| @return readable unsigned 16-bit pointer to first component of pixels |
| */ |
| const uint16_t* addrF16() const { |
| SkASSERT(8 == fInfo.bytesPerPixel()); |
| SkASSERT(kRGBA_F16_SkColorType == fInfo.colorType() || |
| kRGBA_F16Norm_SkColorType == fInfo.colorType()); |
| return reinterpret_cast<const uint16_t*>(fPixels); |
| } |
| |
| /** Returns readable pixel address at (x, y). |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. |
| |
| Will trigger an assert() if SkColorType is not kAlpha_8_SkColorType or |
| kGray_8_SkColorType, and is built with SK_DEBUG defined. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return readable unsigned 8-bit pointer to pixel at (x, y) |
| */ |
| const uint8_t* addr8(int x, int y) const { |
| SkASSERT((unsigned)x < (unsigned)fInfo.width()); |
| SkASSERT((unsigned)y < (unsigned)fInfo.height()); |
| return (const uint8_t*)((const char*)this->addr8() + (size_t)y * fRowBytes + (x << 0)); |
| } |
| |
| /** Returns readable pixel address at (x, y). |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. |
| |
| Will trigger an assert() if SkColorType is not kRGB_565_SkColorType or |
| kARGB_4444_SkColorType, and is built with SK_DEBUG defined. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return readable unsigned 16-bit pointer to pixel at (x, y) |
| */ |
| const uint16_t* addr16(int x, int y) const { |
| SkASSERT((unsigned)x < (unsigned)fInfo.width()); |
| SkASSERT((unsigned)y < (unsigned)fInfo.height()); |
| return (const uint16_t*)((const char*)this->addr16() + (size_t)y * fRowBytes + (x << 1)); |
| } |
| |
| /** Returns readable pixel address at (x, y). |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. |
| |
| Will trigger an assert() if SkColorType is not kRGBA_8888_SkColorType or |
| kBGRA_8888_SkColorType, and is built with SK_DEBUG defined. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return readable unsigned 32-bit pointer to pixel at (x, y) |
| */ |
| const uint32_t* addr32(int x, int y) const { |
| SkASSERT((unsigned)x < (unsigned)fInfo.width()); |
| SkASSERT((unsigned)y < (unsigned)fInfo.height()); |
| return (const uint32_t*)((const char*)this->addr32() + (size_t)y * fRowBytes + (x << 2)); |
| } |
| |
| /** Returns readable pixel address at (x, y). |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. |
| |
| Will trigger an assert() if SkColorType is not kRGBA_F16_SkColorType and is built |
| with SK_DEBUG defined. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return readable unsigned 64-bit pointer to pixel at (x, y) |
| */ |
| const uint64_t* addr64(int x, int y) const { |
| SkASSERT((unsigned)x < (unsigned)fInfo.width()); |
| SkASSERT((unsigned)y < (unsigned)fInfo.height()); |
| return (const uint64_t*)((const char*)this->addr64() + (size_t)y * fRowBytes + (x << 3)); |
| } |
| |
| /** Returns readable pixel address at (x, y). |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. |
| |
| Will trigger an assert() if SkColorType is not kRGBA_F16_SkColorType and is built |
| with SK_DEBUG defined. |
| |
| Each unsigned 16-bit word represents one color component encoded as a half float. |
| Four words correspond to one pixel. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return readable unsigned 16-bit pointer to pixel component at (x, y) |
| */ |
| const uint16_t* addrF16(int x, int y) const { |
| SkASSERT(kRGBA_F16_SkColorType == fInfo.colorType() || |
| kRGBA_F16Norm_SkColorType == fInfo.colorType()); |
| return reinterpret_cast<const uint16_t*>(this->addr64(x, y)); |
| } |
| |
| /** Returns writable base pixel address. |
| |
| @return writable generic base pointer to pixels |
| */ |
| void* writable_addr() const { return const_cast<void*>(fPixels); } |
| |
| /** Returns writable pixel address at (x, y). |
| |
| Input is not validated: out of bounds values of x or y trigger an assert() if |
| built with SK_DEBUG defined. Returns zero if SkColorType is kUnknown_SkColorType. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return writable generic pointer to pixel |
| */ |
| void* writable_addr(int x, int y) const { |
| return const_cast<void*>(this->addr(x, y)); |
| } |
| |
| /** Returns writable pixel address at (x, y). Result is addressable as unsigned |
| 8-bit bytes. Will trigger an assert() if SkColorType is not kAlpha_8_SkColorType |
| or kGray_8_SkColorType, and is built with SK_DEBUG defined. |
| |
| One byte corresponds to one pixel. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return writable unsigned 8-bit pointer to pixels |
| */ |
| uint8_t* writable_addr8(int x, int y) const { |
| return const_cast<uint8_t*>(this->addr8(x, y)); |
| } |
| |
| /** Returns writable_addr pixel address at (x, y). Result is addressable as unsigned |
| 16-bit words. Will trigger an assert() if SkColorType is not kRGB_565_SkColorType |
| or kARGB_4444_SkColorType, and is built with SK_DEBUG defined. |
| |
| One word corresponds to one pixel. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return writable unsigned 16-bit pointer to pixel |
| */ |
| uint16_t* writable_addr16(int x, int y) const { |
| return const_cast<uint16_t*>(this->addr16(x, y)); |
| } |
| |
| /** Returns writable pixel address at (x, y). Result is addressable as unsigned |
| 32-bit words. Will trigger an assert() if SkColorType is not |
| kRGBA_8888_SkColorType or kBGRA_8888_SkColorType, and is built with SK_DEBUG |
| defined. |
| |
| One word corresponds to one pixel. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return writable unsigned 32-bit pointer to pixel |
| */ |
| uint32_t* writable_addr32(int x, int y) const { |
| return const_cast<uint32_t*>(this->addr32(x, y)); |
| } |
| |
| /** Returns writable pixel address at (x, y). Result is addressable as unsigned |
| 64-bit words. Will trigger an assert() if SkColorType is not |
| kRGBA_F16_SkColorType and is built with SK_DEBUG defined. |
| |
| One word corresponds to one pixel. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return writable unsigned 64-bit pointer to pixel |
| */ |
| uint64_t* writable_addr64(int x, int y) const { |
| return const_cast<uint64_t*>(this->addr64(x, y)); |
| } |
| |
| /** Returns writable pixel address at (x, y). Result is addressable as unsigned |
| 16-bit words. Will trigger an assert() if SkColorType is not |
| kRGBA_F16_SkColorType and is built with SK_DEBUG defined. |
| |
| Each word represents one color component encoded as a half float. |
| Four words correspond to one pixel. |
| |
| @param x column index, zero or greater, and less than width() |
| @param y row index, zero or greater, and less than height() |
| @return writable unsigned 16-bit pointer to first component of pixel |
| */ |
| uint16_t* writable_addrF16(int x, int y) const { |
| return reinterpret_cast<uint16_t*>(writable_addr64(x, y)); |
| } |
| |
| /** Copies a SkRect of pixels to dstPixels. Copy starts at (0, 0), and does not |
| exceed SkPixmap (width(), height()). |
| |
| dstInfo specifies width, height, SkColorType, SkAlphaType, and |
| SkColorSpace of destination. dstRowBytes specifics the gap from one destination |
| row to the next. Returns true if pixels are copied. Returns false if |
| dstInfo address equals nullptr, or dstRowBytes is less than dstInfo.minRowBytes(). |
| |
| Pixels are copied only if pixel conversion is possible. If SkPixmap colorType() is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dstInfo.colorType() must match. |
| If SkPixmap colorType() is kGray_8_SkColorType, dstInfo.colorSpace() must match. |
| If SkPixmap alphaType() is kOpaque_SkAlphaType, dstInfo.alphaType() must |
| match. If SkPixmap colorSpace() is nullptr, dstInfo.colorSpace() must match. Returns |
| false if pixel conversion is not possible. |
| |
| Returns false if SkPixmap width() or height() is zero or negative. |
| |
| @param dstInfo destination width, height, SkColorType, SkAlphaType, SkColorSpace |
| @param dstPixels destination pixel storage |
| @param dstRowBytes destination row length |
| @return true if pixels are copied to dstPixels |
| */ |
| bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes) const { |
| return this->readPixels(dstInfo, dstPixels, dstRowBytes, 0, 0); |
| } |
| |
| /** Copies a SkRect of pixels to dstPixels. Copy starts at (srcX, srcY), and does not |
| exceed SkPixmap (width(), height()). |
| |
| dstInfo specifies width, height, SkColorType, SkAlphaType, and |
| SkColorSpace of destination. dstRowBytes specifics the gap from one destination |
| row to the next. Returns true if pixels are copied. Returns false if |
| dstInfo address equals nullptr, or dstRowBytes is less than dstInfo.minRowBytes(). |
| |
| Pixels are copied only if pixel conversion is possible. If SkPixmap colorType() is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dstInfo.colorType() must match. |
| If SkPixmap colorType() is kGray_8_SkColorType, dstInfo.colorSpace() must match. |
| If SkPixmap alphaType() is kOpaque_SkAlphaType, dstInfo.alphaType() must |
| match. If SkPixmap colorSpace() is nullptr, dstInfo.colorSpace() must match. Returns |
| false if pixel conversion is not possible. |
| |
| srcX and srcY may be negative to copy only top or left of source. Returns |
| false if SkPixmap width() or height() is zero or negative. Returns false if: |
| abs(srcX) >= Pixmap width(), or if abs(srcY) >= Pixmap height(). |
| |
| @param dstInfo destination width, height, SkColorType, SkAlphaType, SkColorSpace |
| @param dstPixels destination pixel storage |
| @param dstRowBytes destination row length |
| @param srcX column index whose absolute value is less than width() |
| @param srcY row index whose absolute value is less than height() |
| @return true if pixels are copied to dstPixels |
| */ |
| bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, int srcX, |
| int srcY) const; |
| |
| /** Copies a SkRect of pixels to dst. Copy starts at (srcX, srcY), and does not |
| exceed SkPixmap (width(), height()). dst specifies width, height, SkColorType, |
| SkAlphaType, and SkColorSpace of destination. Returns true if pixels are copied. |
| Returns false if dst address equals nullptr, or dst.rowBytes() is less than |
| dst SkImageInfo::minRowBytes. |
| |
| Pixels are copied only if pixel conversion is possible. If SkPixmap colorType() is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.info().colorType must match. |
| If SkPixmap colorType() is kGray_8_SkColorType, dst.info().colorSpace must match. |
| If SkPixmap alphaType() is kOpaque_SkAlphaType, dst.info().alphaType must |
| match. If SkPixmap colorSpace() is nullptr, dst.info().colorSpace must match. Returns |
| false if pixel conversion is not possible. |
| |
| srcX and srcY may be negative to copy only top or left of source. Returns |
| false SkPixmap width() or height() is zero or negative. Returns false if: |
| abs(srcX) >= Pixmap width(), or if abs(srcY) >= Pixmap height(). |
| |
| @param dst SkImageInfo and pixel address to write to |
| @param srcX column index whose absolute value is less than width() |
| @param srcY row index whose absolute value is less than height() |
| @return true if pixels are copied to dst |
| */ |
| bool readPixels(const SkPixmap& dst, int srcX, int srcY) const { |
| return this->readPixels(dst.info(), dst.writable_addr(), dst.rowBytes(), srcX, srcY); |
| } |
| |
| /** Copies pixels inside bounds() to dst. dst specifies width, height, SkColorType, |
| SkAlphaType, and SkColorSpace of destination. Returns true if pixels are copied. |
| Returns false if dst address equals nullptr, or dst.rowBytes() is less than |
| dst SkImageInfo::minRowBytes. |
| |
| Pixels are copied only if pixel conversion is possible. If SkPixmap colorType() is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dst SkColorType must match. |
| If SkPixmap colorType() is kGray_8_SkColorType, dst SkColorSpace must match. |
| If SkPixmap alphaType() is kOpaque_SkAlphaType, dst SkAlphaType must |
| match. If SkPixmap colorSpace() is nullptr, dst SkColorSpace must match. Returns |
| false if pixel conversion is not possible. |
| |
| Returns false if SkPixmap width() or height() is zero or negative. |
| |
| @param dst SkImageInfo and pixel address to write to |
| @return true if pixels are copied to dst |
| */ |
| bool readPixels(const SkPixmap& dst) const { |
| return this->readPixels(dst.info(), dst.writable_addr(), dst.rowBytes(), 0, 0); |
| } |
| |
| /** Copies SkBitmap to dst, scaling pixels to fit dst.width() and dst.height(), and |
| converting pixels to match dst.colorType() and dst.alphaType(). Returns true if |
| pixels are copied. Returns false if dst address is nullptr, or dst.rowBytes() is |
| less than dst SkImageInfo::minRowBytes. |
| |
| Pixels are copied only if pixel conversion is possible. If SkPixmap colorType() is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dst SkColorType must match. |
| If SkPixmap colorType() is kGray_8_SkColorType, dst SkColorSpace must match. |
| If SkPixmap alphaType() is kOpaque_SkAlphaType, dst SkAlphaType must |
| match. If SkPixmap colorSpace() is nullptr, dst SkColorSpace must match. Returns |
| false if pixel conversion is not possible. |
| |
| Returns false if SkBitmap width() or height() is zero or negative. |
| |
| Scales the image, with filterQuality, to match dst.width() and dst.height(). |
| filterQuality kNone_SkFilterQuality is fastest, typically implemented with |
| nearest neighbor filter. kLow_SkFilterQuality is typically implemented with |
| bilerp filter. kMedium_SkFilterQuality is typically implemented with |
| bilerp filter, and mip-map filter when size is reduced. |
| kHigh_SkFilterQuality is slowest, typically implemented with bicubic filter. |
| |
| @param dst SkImageInfo and pixel address to write to |
| @return true if pixels are scaled to fit dst |
| |
| example: https://fiddle.skia.org/c/@Pixmap_scalePixels |
| */ |
| bool scalePixels(const SkPixmap& dst, SkFilterQuality filterQuality) const; |
| |
| /** Writes color to pixels bounded by subset; returns true on success. |
| Returns false if colorType() is kUnknown_SkColorType, or if subset does |
| not intersect bounds(). |
| |
| @param color sRGB unpremultiplied color to write |
| @param subset bounding integer SkRect of written pixels |
| @return true if pixels are changed |
| |
| example: https://fiddle.skia.org/c/@Pixmap_erase |
| */ |
| bool erase(SkColor color, const SkIRect& subset) const; |
| |
| /** Writes color to pixels inside bounds(); returns true on success. |
| Returns false if colorType() is kUnknown_SkColorType, or if bounds() |
| is empty. |
| |
| @param color sRGB unpremultiplied color to write |
| @return true if pixels are changed |
| */ |
| bool erase(SkColor color) const { return this->erase(color, this->bounds()); } |
| |
| /** Writes color to pixels bounded by subset; returns true on success. |
| if subset is nullptr, writes colors pixels inside bounds(). Returns false if |
| colorType() is kUnknown_SkColorType, if subset is not nullptr and does |
| not intersect bounds(), or if subset is nullptr and bounds() is empty. |
| |
| @param color sRGB unpremultiplied color to write |
| @param subset bounding integer SkRect of pixels to write; may be nullptr |
| @return true if pixels are changed |
| |
| example: https://fiddle.skia.org/c/@Pixmap_erase_3 |
| */ |
| bool erase(const SkColor4f& color, const SkIRect* subset = nullptr) const { |
| return this->erase(color, nullptr, subset); |
| } |
| |
| /** Writes color to pixels bounded by subset; returns true on success. |
| if subset is nullptr, writes colors pixels inside bounds(). Returns false if |
| colorType() is kUnknown_SkColorType, if subset is not nullptr and does |
| not intersect bounds(), or if subset is nullptr and bounds() is empty. |
| |
| @param color unpremultiplied color to write |
| @param cs SkColorSpace of color |
| @param subset bounding integer SkRect of pixels to write; may be nullptr |
| @return true if pixels are changed |
| */ |
| bool erase(const SkColor4f& color, SkColorSpace* cs, const SkIRect* subset = nullptr) const; |
| |
| private: |
| const void* fPixels; |
| size_t fRowBytes; |
| SkImageInfo fInfo; |
| |
| friend class SkPixmapPriv; |
| }; |
| |
| #endif |
