SkImageInfo.cpp File Reference

#include "include/core/SkImageInfo.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorSpace.h"
#include "include/private/base/SkAssert.h"
#include "src/base/SkSafeMath.h"
#include "src/core/SkImageInfoPriv.h"

Go to the source code of this file.

Functions
int	SkColorTypeBytesPerPixel (SkColorType ct)
bool	SkColorTypeIsAlwaysOpaque (SkColorType ct)
bool	SkColorTypeValidateAlphaType (SkColorType colorType, SkAlphaType alphaType, SkAlphaType *canonical)

Function Documentation

SkColorTypeBytesPerPixel()

int SkColorTypeBytesPerPixel

(

SkColorType

ct

)

Returns the number of bytes required to store a pixel, including unused padding. Returns zero if ct is kUnknown_SkColorType or invalid.

Returns

bytes per pixel

Definition at line 16 of file SkImageInfo.cpp.

                                             {
    switch (ct) {
        case kUnknown_SkColorType:            return 0;
        case kAlpha_8_SkColorType:            return 1;
        case kRGB_565_SkColorType:            return 2;
        case kARGB_4444_SkColorType:          return 2;
        case kRGBA_8888_SkColorType:          return 4;
        case kBGRA_8888_SkColorType:          return 4;
        case kRGB_888x_SkColorType:           return 4;
        case kRGBA_1010102_SkColorType:       return 4;
        case kRGB_101010x_SkColorType:        return 4;
        case kBGRA_1010102_SkColorType:       return 4;
        case kBGR_101010x_SkColorType:        return 4;
        case kBGR_101010x_XR_SkColorType:     return 4;
        case kBGRA_10101010_XR_SkColorType:   return 8;
        case kRGBA_10x6_SkColorType:          return 8;
        case kGray_8_SkColorType:             return 1;
        case kRGBA_F16Norm_SkColorType:       return 8;
        case kRGBA_F16_SkColorType:           return 8;
        case kRGBA_F32_SkColorType:           return 16;
        case kR8G8_unorm_SkColorType:         return 2;
        case kA16_unorm_SkColorType:          return 2;
        case kR16G16_unorm_SkColorType:       return 4;
        case kA16_float_SkColorType:          return 2;
        case kR16G16_float_SkColorType:       return 4;
        case kR16G16B16A16_unorm_SkColorType: return 8;
        case kSRGBA_8888_SkColorType:         return 4;
        case kR8_unorm_SkColorType:           return 1;
    }
    SkUNREACHABLE;
}

SkColorTypeIsAlwaysOpaque()

bool SkColorTypeIsAlwaysOpaque

(

SkColorType

ct

)

Returns true if SkColorType always decodes alpha to 1.0, making the pixel fully opaque. If true, SkColorType does not reserve bits to encode alpha.

Returns

true if alpha is always set to 1.0

Definition at line 48 of file SkImageInfo.cpp.

                                               {
    return !(SkColorTypeChannelFlags(ct) & kAlpha_SkColorChannelFlag);
}

SkColorTypeValidateAlphaType()

bool SkColorTypeValidateAlphaType	(	SkColorType	colorType,
		SkAlphaType	alphaType,
		SkAlphaType *	canonical = nullptr
	)

Returns true if canonical can be set to a valid SkAlphaType for colorType. If there is more than one valid canonical SkAlphaType, set to alphaType, if valid. If true is returned and canonical is not nullptr, store valid SkAlphaType.

Returns false only if alphaType is kUnknown_SkAlphaType, color type is not kUnknown_SkColorType, and SkColorType is not always opaque. If false is returned, canonical is ignored.

Parameters

canonical

storage for SkAlphaType

Returns

true if valid SkAlphaType can be associated with colorType

Definition at line 194 of file SkImageInfo.cpp.

                                                          {
    switch (colorType) {
        case kUnknown_SkColorType:
            alphaType = kUnknown_SkAlphaType;
            break;
        case kAlpha_8_SkColorType:         // fall-through
        case kA16_unorm_SkColorType:       // fall-through
        case kA16_float_SkColorType:
            if (kUnpremul_SkAlphaType == alphaType) {
                alphaType = kPremul_SkAlphaType;
            }
            [[fallthrough]];
        case kARGB_4444_SkColorType:
        case kRGBA_8888_SkColorType:
        case kSRGBA_8888_SkColorType:
        case kBGRA_8888_SkColorType:
        case kRGBA_1010102_SkColorType:
        case kBGRA_1010102_SkColorType:
        case kRGBA_10x6_SkColorType:
        case kRGBA_F16Norm_SkColorType:
        case kRGBA_F16_SkColorType:
        case kRGBA_F32_SkColorType:
        case kBGRA_10101010_XR_SkColorType:
        case kR16G16B16A16_unorm_SkColorType:
            if (kUnknown_SkAlphaType == alphaType) {
                return false;
            }
            break;
        case kGray_8_SkColorType:
        case kR8G8_unorm_SkColorType:
        case kR16G16_unorm_SkColorType:
        case kR16G16_float_SkColorType:
        case kRGB_565_SkColorType:
        case kRGB_888x_SkColorType:
        case kRGB_101010x_SkColorType:
        case kBGR_101010x_SkColorType:
        case kBGR_101010x_XR_SkColorType:
        case kR8_unorm_SkColorType:
            alphaType = kOpaque_SkAlphaType;
            break;
    }
    if (canonical) {
        *canonical = alphaType;
    }
    return true;
}