Pixmap provides a utility to pair SkImageInfo with pixels and row bytes. Pixmap is a low level class which provides convenience functions to access raster destinations. Canvas can not draw Pixmap, nor does Pixmap provide a direct drawing destination.
Use Bitmap to draw pixels referenced by Pixmap; use Surface to draw into pixels referenced by Pixmap.
Pixmap does not try to manage the lifetime of the pixel memory. Use Pixel_Ref to manage pixel memory; Pixel_Ref is safe across threads.
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.
empty SkPixmap
width: 0 height: 0 color: kUnknown_SkColorType alpha: kUnknown_SkAlphaType width: 25 height: 35 color: kRGBA_8888_SkColorType alpha: kOpaque_SkAlphaType
SkPixmap(const SkImageInfo& info, const void* addr, size_t rowBytes) reset() SkAlphaType SkColorType
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.
initialized SkPixmap
image alpha only = false copy alpha only = true
SkPixmap() reset() SkAlphaType SkColorType
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.
width: 25 height: 35 color: kRGBA_8888_SkColorType alpha: kOpaque_SkAlphaType width: 0 height: 0 color: kUnknown_SkColorType alpha: kUnknown_SkAlphaType
SkPixmap() SkAlphaType SkColorType
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.
SkPixmap(const SkImageInfo& info, const void* addr, size_t rowBytes) reset() SkAlphaType SkColorType
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.
is unique is not unique
Color_Space SkImageInfo::makeColorSpace
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.
true if intersection of SkPixmap and area is not empty
reset() SkIRect::intersect
Returns width, height, SkAlphaType, SkColorType, and SkColorSpace.
reference to SkImageInfo
width: 384 height: 384 color: BGRA_8888 alpha: Opaque
Image_Info
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 Bitmap creator to ensure that row bytes is a useful value.
byte length of pixel row
rowBytes: 2 minRowBytes: 4 rowBytes: 8 minRowBytes: 4
addr() info() SkImageInfo::minRowBytes
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.
pixel address
#Volatile pixels address: 0x7f2a440bb010 inset address: 0x7f2a440fb210
addr(int x, int y) addr8 addr16 addr32 addr64 info() rowBytes()
Returns pixel count in each pixel row. Should be equal or less than:
rowBytes() / info().bytesPerPixel().
pixel width in Image_Info
pixmap width: 16 info width: 16
height() SkImageInfo::width()
Returns pixel row count.
pixel height in SkImageInfo
pixmap height: 32 info height: 32
width SkImageInfo::height
Returns Color_Type, one of: kUnknown_SkColorType, kAlpha_8_SkColorType, kRGB_565_SkColorType, kARGB_4444_SkColorType, kRGBA_8888_SkColorType, kRGB_888x_SkColorType, kBGRA_8888_SkColorType, kRGBA_1010102_SkColorType, kRGB_101010x_SkColorType, kGray_8_SkColorType, kRGBA_F16_SkColorType .
Color_Type in Image_Info
color type: kAlpha_8_SkColorType
alphaType() SkImageInfo::colorType
Returns Alpha_Type, one of: kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType .
Alpha_Type in Image_Info
alpha type: kPremul_SkAlphaType
colorType() SkImageInfo::alphaType
Returns SkColorSpace, the range of colors, associated with SkImageInfo. The reference count of SkColorSpace is unchanged. The returned SkColorSpace is immutable.
SkColorSpace in SkImageInfo, or nullptr
gammaCloseToSRGB: false gammaIsLinear: true isSRGB: false
Color_Space SkImageInfo::colorSpace
Returns true if SkAlphaType is kOpaque_SkAlphaType. Does not check if SkColorType allows alpha, or if any pixel value has transparency.
true if SkImageInfo has opaque SkAlphaType
isOpaque: false isOpaque: false isOpaque: true isOpaque: true
computeIsOpaque SkImageInfo::isOpaque
Returns SkIRect { 0, 0, width(), height() }.
integral rectangle from origin to width() and height()
width: 0 height: 0 empty: true width: 0 height: 2 empty: true width: 2 height: 0 empty: true width: 2 height: 2 empty: false
height() width() IRect
Returns number of pixels that fit on row. Should be greater than or equal to width().
maximum pixels per row
rowBytes: 4 rowBytesAsPixels: 1 rowBytes: 5 rowBytesAsPixels: 1 rowBytes: 6 rowBytesAsPixels: 1 rowBytes: 7 rowBytesAsPixels: 1 rowBytes: 8 rowBytesAsPixels: 2
rowBytes shiftPerPixel width SkImageInfo::bytesPerPixel
Returns bit shift converting row bytes to row pixels. Returns zero for kUnknown_SkColorType.
one of: 0, 1, 2, 3; left shift to convert pixels to bytes
color: kUnknown_SkColorType bytesPerPixel: 0 shiftPerPixel: 0 color: kAlpha_8_SkColorType bytesPerPixel: 1 shiftPerPixel: 0 color: kRGB_565_SkColorType bytesPerPixel: 2 shiftPerPixel: 1 color: kARGB_4444_SkColorType bytesPerPixel: 2 shiftPerPixel: 1 color: kRGBA_8888_SkColorType bytesPerPixel: 4 shiftPerPixel: 2 color: kBGRA_8888_SkColorType bytesPerPixel: 4 shiftPerPixel: 2 color: kGray_8_SkColorType bytesPerPixel: 1 shiftPerPixel: 0 color: kRGBA_F16_SkColorType bytesPerPixel: 8 shiftPerPixel: 3
rowBytes rowBytesAsPixels width SkImageInfo::bytesPerPixel
Returns minimum memory required for pixel storage. Does not include unused memory on last row when rowBytesAsPixels() exceeds width(). Returns zero 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.
size in bytes of image buffer
width: 1 height: 1 computeByteSize: 4 width: 1 height: 1000 computeByteSize: 4999 width: 1 height: 1000000 computeByteSize: 4999999 width: 1000 height: 1 computeByteSize: 4000 width: 1000 height: 1000 computeByteSize: 4999000 width: 1000 height: 1000000 computeByteSize: 4999999000 width: 1000000 height: 1 computeByteSize: 4000000 width: 1000000 height: 1000 computeByteSize: 4999000000 width: 1000000 height: 1000000 computeByteSize: 4999999000000
SkImageInfo::computeByteSize
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.
true if all pixels have opaque values or SkColorType is opaque
computeIsOpaque: false computeIsOpaque: true computeIsOpaque: false computeIsOpaque: true
isOpaque Color_Type Alpha
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.
pixel converted to unpremultiplied color
Premultiplied: (0, 0) 0x00000000 0x2a0e002a 0x55380055 0x7f7f007f (0, 1) 0x2a000e2a 0x551c1c55 0x7f542a7f 0xaaaa38aa (0, 2) 0x55003855 0x7f2a547f 0xaa7171aa 0xd4d48dd4 (0, 3) 0x7f007f7f 0xaa38aaaa 0xd48dd4d4 0xffffffff Unpremultiplied: (0, 0) 0x00000000 0x2a5500ff 0x55a800ff 0x7fff00ff (0, 1) 0x2a0055ff 0x555454ff 0x7fa954ff 0xaaff54ff (0, 2) 0x5500a8ff 0x7f54a9ff 0xaaaaaaff 0xd4ffaaff (0, 3) 0x7f00ffff 0xaa54ffff 0xd4aaffff 0xffffffff
getAlphaf addr() readPixels
Looks 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 efficient (and more precise if the pixels store more than 8 bits per component).
alpha converted to normalized float
getColor
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().
readable generic pointer to pixel
pixmap.addr(1, 2) == &storage[1 + 2 * w]
addr8 addr16 addr32 addr64 addrF16 getColor writable_addr SkBitmap::getAddr
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.
readable unsigned 8-bit pointer to pixels
pixmap.addr8() == storage
addr() addr16 addr32 addr64 addrF16 getColor writable_addr writable_addr8
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.
readable unsigned 16-bit pointer to pixels
pixmap.addr16() == storage
addr() addr8 addr32 addr64 addrF16 getColor writable_addr writable_addr16
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.
readable unsigned 32-bit pointer to pixels
pixmap.addr32() == storage
addr() addr8 addr16 addr64 addrF16 getColor writable_addr writable_addr32
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.
readable unsigned 64-bit pointer to pixels
pixmap.addr64() == storage
addr() addr8 addr16 addr32 addrF16 getColor writable_addr writable_addr64
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.
readable unsigned 16-bit pointer to first component of pixels
pixmap.addrF16() == storage
addr() addr8 addr16 addr32 addr64 getColor writable_addr writable_addrF16
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.
readable unsigned 8-bit pointer to pixel at (x, y)
pixmap.addr8(1, 2) == &storage[1 + 2 * w]
addr() addr16 addr32 addr64 addrF16 getColor writable_addr writable_addr8
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.
readable unsigned 16-bit pointer to pixel at (x, y)
pixmap.addr16(1, 2) == &storage[1 + 2 * w]
addr() addr8 addr32 addr64 addrF16 getColor writable_addr writable_addr16
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.
readable unsigned 32-bit pointer to pixel at (x, y)
pixmap.addr32(1, 2) == &storage[1 + 2 * w]
addr() addr8 addr16 addr64 addrF16 getColor writable_addr writable_addr64
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.
readable unsigned 64-bit pointer to pixel at (x, y)
pixmap.addr64(1, 2) == &storage[1 + 2 * w]
addr() addr8 addr16 addr32 addrF16 getColor writable_addr writable_addr64
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.
readable unsigned 16-bit pointer to pixel component at (x, y)
pixmap.addrF16(1, 2) == &storage[1 * wordsPerPixel + 2 * rowWords]
addr() addr8 addr16 addr32 addr64 getColor writable_addr writable_addrF16
Returns writable base pixel address.
writable generic base pointer to pixels
pixmap.writable_addr() == (void *)storage pixmap.getColor(0, 1) == 0x00000000 pixmap.getColor(0, 0) == 0xFFFFFFFF
writable_addr8 writable_addr16 writable_addr32 writable_addr64 writable_addrF16 addr()
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.
writable generic pointer to pixel
pixmap.writable_addr() == (void *)storage pixmap.getColor(0, 0) == 0x00000000 pixmap.getColor(1, 2) == 0xFFFFFFFF
writable_addr8 writable_addr16 writable_addr32 writable_addr64 writable_addrF16 addr()
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.
writable unsigned 8-bit pointer to pixels
writable_addr writable_addr16 writable_addr32 writable_addr64 writable_addrF16 addr() addr8
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.
writable unsigned 16-bit pointer to pixel
writable_addr writable_addr8 writable_addr32 writable_addr64 writable_addrF16 addr() addr16
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.
writable unsigned 32-bit pointer to pixel
writable_addr writable_addr8 writable_addr16 writable_addr64 writable_addrF16 addr() addr32
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.
writable unsigned 64-bit pointer to pixel
writable_addr writable_addr8 writable_addr16 writable_addr32 writable_addrF16 addr() addr64
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.
writable unsigned 16-bit pointer to first component of pixel
writable_addr writable_addr8 writable_addr16 writable_addr32 writable_addr64 addr() addrF16
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.
true if pixels are copied to dstPixels
erase SkBitmap::readPixels SkCanvas::drawBitmap SkCanvas::readPixels SkImage::readPixels SkSurface::readPixels
Copies a Rect of pixels to dstPixels. Copy starts at (srcX, srcY), and does not exceed Pixmap (width(), height()).
dstInfo specifies width, height, Color_Type, Alpha_Type, and Color_Space of destination. dstRowBytes specifics the gap from one destination row to the next. Returns true if pixels are copied. Returns false if dstInfo has no address, or dstRowBytes is less than dstInfo.minRowBytes().
Pixels are copied only if pixel conversion is possible. If Pixmap colorType is kGray_8_SkColorType, or kAlpha_8_SkColorType; dstInfo.colorType() must match. If Pixmap colorType is kGray_8_SkColorType, dstInfo.colorSpace() must match. If Pixmap alphaType is kOpaque_SkAlphaType, dstInfo.alphaType() must match. If Pixmap 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 Pixmap width() or height() is zero or negative. Returns false if:
abs(srcX) >= Pixmap width(), or if abs(srcY) >= Pixmap height().
true if pixels are copied to dstPixels
erase SkBitmap::readPixels SkCanvas::drawBitmap SkCanvas::readPixels SkImage::readPixels SkSurface::readPixels
Copies a Rect of pixels to dst. Copy starts at (srcX, srcY), and does not exceed Pixmap (width(), height()). dst specifies width, height, Color_Type, Alpha_Type, and Color_Space of destination. Returns true if pixels are copied. Returns false if dst.addr() equals nullptr, or dst.rowBytes() is less than dst SkImageInfo::minRowBytes.
Pixels are copied only if pixel conversion is possible. If Pixmap colorType is kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.info().colorType() must match. If Pixmap colorType is kGray_8_SkColorType, dst.info().colorSpace() must match. If Pixmap alphaType is kOpaque_SkAlphaType, dst.info().alphaType() must match. If Pixmap 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 Pixmap width() or height() is zero or negative. Returns false if:
abs(srcX) >= Pixmap width(), or if abs(srcY) >= Pixmap height().
true if pixels are copied to dst
erase SkBitmap::readPixels SkCanvas::drawBitmap SkCanvas::readPixels SkImage::readPixels SkSurface::readPixels
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.
true if pixels are copied to dst
erase SkBitmap::readPixels SkCanvas::drawBitmap SkCanvas::readPixels SkImage::readPixels SkSurface::readPixels
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.
kMedium_SkFilterQuality, kHigh_SkFilterQuality
true if pixels are scaled to fit dst
SkCanvas::drawBitmap SkImage::scalePixels
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().
true if pixels are changed
SkBitmap::erase SkCanvas::clear SkCanvas::drawColor
Writes color to pixels inside bounds(); returns true on success. Returns false if colorType() is kUnknown_SkColorType, or if bounds() is empty.
true if pixels are changed
SkBitmap::erase SkCanvas::clear SkCanvas::drawColor
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.
true if pixels are changed
SkBitmap::erase SkCanvas::clear SkCanvas::drawColor