8f34372f7e
To do this, create SkImageCacherator, which wraps a generator and provides an interface to get a cached answer for either the raster or texture output of the generator. BUG=skia: Review URL: https://codereview.chromium.org/1291803002
335 lines
10 KiB
C++
335 lines
10 KiB
C++
/*
|
|
* Copyright 2013 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkImageInfo_DEFINED
|
|
#define SkImageInfo_DEFINED
|
|
|
|
#include "SkMath.h"
|
|
#include "SkRect.h"
|
|
#include "SkSize.h"
|
|
|
|
class SkReadBuffer;
|
|
class SkWriteBuffer;
|
|
|
|
/**
|
|
* This enum provides information about "how" an image will be used. For older GPUs that do not
|
|
* support non-power-of-2 tiling, some routines need to know this information before they create
|
|
* a texture.
|
|
*/
|
|
enum SkImageUsageType {
|
|
/* Image will not be tiled (regardless of filtering) */
|
|
kUntiled_SkImageUsageType,
|
|
|
|
/* Image will be tiled, but not filtered */
|
|
kTiled_Unfiltered_SkImageUsageType,
|
|
|
|
/* Image will be tiled and filtered */
|
|
kTiled_Filtered_SkImageUsageType,
|
|
};
|
|
|
|
/**
|
|
* Describes how to interpret the alpha compoent of a pixel.
|
|
*/
|
|
enum SkAlphaType {
|
|
kUnknown_SkAlphaType,
|
|
|
|
/**
|
|
* All pixels are stored as opaque. This differs slightly from kIgnore in
|
|
* that kOpaque has correct "opaque" values stored in the pixels, while
|
|
* kIgnore may not, but in both cases the caller should treat the pixels
|
|
* as opaque.
|
|
*/
|
|
kOpaque_SkAlphaType,
|
|
|
|
/**
|
|
* All pixels have their alpha premultiplied in their color components.
|
|
* This is the natural format for the rendering target pixels.
|
|
*/
|
|
kPremul_SkAlphaType,
|
|
|
|
/**
|
|
* All pixels have their color components stored without any regard to the
|
|
* alpha. e.g. this is the default configuration for PNG images.
|
|
*
|
|
* This alpha-type is ONLY supported for input images. Rendering cannot
|
|
* generate this on output.
|
|
*/
|
|
kUnpremul_SkAlphaType,
|
|
|
|
kLastEnum_SkAlphaType = kUnpremul_SkAlphaType
|
|
};
|
|
|
|
static inline bool SkAlphaTypeIsOpaque(SkAlphaType at) {
|
|
return kOpaque_SkAlphaType == at;
|
|
}
|
|
|
|
static inline bool SkAlphaTypeIsValid(unsigned value) {
|
|
return value <= kLastEnum_SkAlphaType;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
/**
|
|
* Describes how to interpret the components of a pixel.
|
|
*
|
|
* kN32_SkColorType is an alias for whichever 32bit ARGB format is the "native"
|
|
* form for skia's blitters. Use this if you don't have a swizzle preference
|
|
* for 32bit pixels.
|
|
*/
|
|
enum SkColorType {
|
|
kUnknown_SkColorType,
|
|
kAlpha_8_SkColorType,
|
|
kRGB_565_SkColorType,
|
|
kARGB_4444_SkColorType,
|
|
kRGBA_8888_SkColorType,
|
|
kBGRA_8888_SkColorType,
|
|
kIndex_8_SkColorType,
|
|
kGray_8_SkColorType,
|
|
|
|
kLastEnum_SkColorType = kGray_8_SkColorType,
|
|
|
|
#if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
|
|
kN32_SkColorType = kBGRA_8888_SkColorType,
|
|
#elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
|
|
kN32_SkColorType = kRGBA_8888_SkColorType,
|
|
#else
|
|
#error "SK_*32_SHFIT values must correspond to BGRA or RGBA byte order"
|
|
#endif
|
|
};
|
|
|
|
static int SkColorTypeBytesPerPixel(SkColorType ct) {
|
|
static const uint8_t gSize[] = {
|
|
0, // Unknown
|
|
1, // Alpha_8
|
|
2, // RGB_565
|
|
2, // ARGB_4444
|
|
4, // RGBA_8888
|
|
4, // BGRA_8888
|
|
1, // kIndex_8
|
|
1, // kGray_8
|
|
};
|
|
SK_COMPILE_ASSERT(SK_ARRAY_COUNT(gSize) == (size_t)(kLastEnum_SkColorType + 1),
|
|
size_mismatch_with_SkColorType_enum);
|
|
|
|
SkASSERT((size_t)ct < SK_ARRAY_COUNT(gSize));
|
|
return gSize[ct];
|
|
}
|
|
|
|
static inline size_t SkColorTypeMinRowBytes(SkColorType ct, int width) {
|
|
return width * SkColorTypeBytesPerPixel(ct);
|
|
}
|
|
|
|
static inline bool SkColorTypeIsValid(unsigned value) {
|
|
return value <= kLastEnum_SkColorType;
|
|
}
|
|
|
|
static inline size_t SkColorTypeComputeOffset(SkColorType ct, int x, int y, size_t rowBytes) {
|
|
int shift = 0;
|
|
switch (SkColorTypeBytesPerPixel(ct)) {
|
|
case 4: shift = 2; break;
|
|
case 2: shift = 1; break;
|
|
case 1: shift = 0; break;
|
|
default: return 0;
|
|
}
|
|
return y * rowBytes + (x << shift);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
/**
|
|
* Return true if alphaType is supported by colorType. If there is a canonical
|
|
* alphaType for this colorType, return it in canonical.
|
|
*/
|
|
bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
|
|
SkAlphaType* canonical = NULL);
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
/**
|
|
* Describes the color space a YUV pixel.
|
|
*/
|
|
enum SkYUVColorSpace {
|
|
/** Standard JPEG color space. */
|
|
kJPEG_SkYUVColorSpace,
|
|
/** SDTV standard Rec. 601 color space. Uses "studio swing" [16, 235] color
|
|
range. See http://en.wikipedia.org/wiki/Rec._601 for details. */
|
|
kRec601_SkYUVColorSpace,
|
|
/** HDTV standard Rec. 709 color space. Uses "studio swing" [16, 235] color
|
|
range. See http://en.wikipedia.org/wiki/Rec._709 for details. */
|
|
kRec709_SkYUVColorSpace,
|
|
|
|
kLastEnum_SkYUVColorSpace = kRec709_SkYUVColorSpace
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
enum SkColorProfileType {
|
|
kLinear_SkColorProfileType,
|
|
kSRGB_SkColorProfileType,
|
|
|
|
kLastEnum_SkColorProfileType = kSRGB_SkColorProfileType
|
|
};
|
|
|
|
/**
|
|
* Describe an image's dimensions and pixel type.
|
|
* Used for both src images and render-targets (surfaces).
|
|
*/
|
|
struct SK_API SkImageInfo {
|
|
public:
|
|
SkImageInfo()
|
|
: fWidth(0)
|
|
, fHeight(0)
|
|
, fColorType(kUnknown_SkColorType)
|
|
, fAlphaType(kUnknown_SkAlphaType)
|
|
, fProfileType(kLinear_SkColorProfileType)
|
|
{}
|
|
|
|
static SkImageInfo Make(int width, int height, SkColorType ct, SkAlphaType at,
|
|
SkColorProfileType pt = kLinear_SkColorProfileType) {
|
|
return SkImageInfo(width, height, ct, at, pt);
|
|
}
|
|
|
|
/**
|
|
* Sets colortype to the native ARGB32 type.
|
|
*/
|
|
static SkImageInfo MakeN32(int width, int height, SkAlphaType at,
|
|
SkColorProfileType pt = kLinear_SkColorProfileType) {
|
|
return SkImageInfo(width, height, kN32_SkColorType, at, pt);
|
|
}
|
|
|
|
/**
|
|
* Sets colortype to the native ARGB32 type, and the alphatype to premul.
|
|
*/
|
|
static SkImageInfo MakeN32Premul(int width, int height,
|
|
SkColorProfileType pt = kLinear_SkColorProfileType) {
|
|
return SkImageInfo(width, height, kN32_SkColorType, kPremul_SkAlphaType, pt);
|
|
}
|
|
|
|
/**
|
|
* Sets colortype to the native ARGB32 type, and the alphatype to premul.
|
|
*/
|
|
static SkImageInfo MakeN32Premul(const SkISize& size,
|
|
SkColorProfileType pt = kLinear_SkColorProfileType) {
|
|
return MakeN32Premul(size.width(), size.height(), pt);
|
|
}
|
|
|
|
static SkImageInfo MakeA8(int width, int height) {
|
|
return SkImageInfo(width, height, kAlpha_8_SkColorType, kPremul_SkAlphaType,
|
|
kLinear_SkColorProfileType);
|
|
}
|
|
|
|
static SkImageInfo MakeUnknown(int width, int height) {
|
|
return SkImageInfo(width, height, kUnknown_SkColorType, kUnknown_SkAlphaType,
|
|
kLinear_SkColorProfileType);
|
|
}
|
|
|
|
static SkImageInfo MakeUnknown() {
|
|
return SkImageInfo();
|
|
}
|
|
|
|
int width() const { return fWidth; }
|
|
int height() const { return fHeight; }
|
|
SkColorType colorType() const { return fColorType; }
|
|
SkAlphaType alphaType() const { return fAlphaType; }
|
|
SkColorProfileType profileType() const { return fProfileType; }
|
|
|
|
bool isEmpty() const { return fWidth <= 0 || fHeight <= 0; }
|
|
|
|
bool isOpaque() const {
|
|
return SkAlphaTypeIsOpaque(fAlphaType);
|
|
}
|
|
|
|
bool isLinear() const { return kLinear_SkColorProfileType == fProfileType; }
|
|
bool isSRGB() const { return kSRGB_SkColorProfileType == fProfileType; }
|
|
|
|
SkISize dimensions() const { return SkISize::Make(fWidth, fHeight); }
|
|
SkIRect bounds() const { return SkIRect::MakeWH(fWidth, fHeight); }
|
|
|
|
/**
|
|
* Return a new ImageInfo with the same colortype and alphatype as this info,
|
|
* but with the specified width and height.
|
|
*/
|
|
SkImageInfo makeWH(int newWidth, int newHeight) const {
|
|
return SkImageInfo::Make(newWidth, newHeight, fColorType, fAlphaType, fProfileType);
|
|
}
|
|
|
|
SkImageInfo makeAlphaType(SkAlphaType newAlphaType) const {
|
|
return SkImageInfo::Make(fWidth, fHeight, fColorType, newAlphaType, fProfileType);
|
|
}
|
|
|
|
SkImageInfo makeColorType(SkColorType newColorType) const {
|
|
return SkImageInfo::Make(fWidth, fHeight, newColorType, fAlphaType, fProfileType);
|
|
}
|
|
|
|
int bytesPerPixel() const {
|
|
return SkColorTypeBytesPerPixel(fColorType);
|
|
}
|
|
|
|
uint64_t minRowBytes64() const {
|
|
return sk_64_mul(fWidth, this->bytesPerPixel());
|
|
}
|
|
|
|
size_t minRowBytes() const {
|
|
return (size_t)this->minRowBytes64();
|
|
}
|
|
|
|
size_t computeOffset(int x, int y, size_t rowBytes) const {
|
|
SkASSERT((unsigned)x < (unsigned)fWidth);
|
|
SkASSERT((unsigned)y < (unsigned)fHeight);
|
|
return SkColorTypeComputeOffset(fColorType, x, y, rowBytes);
|
|
}
|
|
|
|
bool operator==(const SkImageInfo& other) const {
|
|
return 0 == memcmp(this, &other, sizeof(other));
|
|
}
|
|
bool operator!=(const SkImageInfo& other) const {
|
|
return 0 != memcmp(this, &other, sizeof(other));
|
|
}
|
|
|
|
void unflatten(SkReadBuffer&);
|
|
void flatten(SkWriteBuffer&) const;
|
|
|
|
int64_t getSafeSize64(size_t rowBytes) const {
|
|
if (0 == fHeight) {
|
|
return 0;
|
|
}
|
|
return sk_64_mul(fHeight - 1, rowBytes) + fWidth * this->bytesPerPixel();
|
|
}
|
|
|
|
size_t getSafeSize(size_t rowBytes) const {
|
|
int64_t size = this->getSafeSize64(rowBytes);
|
|
if (!sk_64_isS32(size)) {
|
|
return 0;
|
|
}
|
|
return sk_64_asS32(size);
|
|
}
|
|
|
|
bool validRowBytes(size_t rowBytes) const {
|
|
uint64_t rb = sk_64_mul(fWidth, this->bytesPerPixel());
|
|
return rowBytes >= rb;
|
|
}
|
|
|
|
SkDEBUGCODE(void validate() const;)
|
|
|
|
private:
|
|
int fWidth;
|
|
int fHeight;
|
|
SkColorType fColorType;
|
|
SkAlphaType fAlphaType;
|
|
SkColorProfileType fProfileType;
|
|
|
|
SkImageInfo(int width, int height, SkColorType ct, SkAlphaType at, SkColorProfileType pt)
|
|
: fWidth(width)
|
|
, fHeight(height)
|
|
, fColorType(ct)
|
|
, fAlphaType(at)
|
|
, fProfileType(pt)
|
|
{}
|
|
};
|
|
|
|
#endif
|