2  * Copyright 2015 Google Inc.
5  * found in the LICENSE file.
8 #include "SkAndroidCodec.h"
9 #include "SkCodec.h"
10 #include "SkCodecPriv.h"
11 #include "SkRawAdapterCodec.h"
12 #include "SkSampledCodec.h"
13 #include "SkWebpAdapterCodec.h"
21  *  Loads the gamut as a set of three points (triangle).
23 static void load_gamut(SkPoint rgb[], const SkMatrix44& xyz) {  in load_gamut()  argument
26     // gx, gy, bx, and gy are calulcated similarly.  in load_gamut()
27     float rSum = xyz.get(0, 0) + xyz.get(1, 0) + xyz.get(2, 0);  in load_gamut()
28     float gSum = xyz.get(0, 1) + xyz.get(1, 1) + xyz.get(2, 1);  in load_gamut()
29     float bSum = xyz.get(0, 2) + xyz.get(1, 2) + xyz.get(2, 2);  in load_gamut()
30     rgb[0].fX = xyz.get(0, 0) / rSum;  in load_gamut()
31     rgb[0].fY = xyz.get(1, 0) / rSum;  in load_gamut()
32     rgb[1].fX = xyz.get(0, 1) / gSum;  in load_gamut()
33     rgb[1].fY = xyz.get(1, 1) / gSum;  in load_gamut()
34     rgb[2].fX = xyz.get(0, 2) / bSum;  in load_gamut()
35     rgb[2].fY = xyz.get(1, 2) / bSum;  in load_gamut()
39  *  Calculates the area of the triangular gamut.
45     return 0.5f * SkTAbs(a.fX*b.fY + b.fX*c.fY - a.fX*c.fY - c.fX*b.fY - b.fX*a.fY);  in calculate_area()
51     // Determine if the source image has a gamut that is wider than sRGB.  If so, we  in is_wide_gamut()
52     // will use P3 as the output color space to avoid clipping the gamut.  in is_wide_gamut()
55         SkPoint rgb[3];  in is_wide_gamut()  local
56         load_gamut(rgb, *toXYZD50);  in is_wide_gamut()
57         return calculate_area(rgb) > kSRGB_D50_GamutArea;  in is_wide_gamut()
88             return new SkSampledCodec(codec.release());  in NewFromStream()
91             return new SkWebpAdapterCodec((SkWebpCodec*) codec.release());  in NewFromStream()
95             return new SkRawAdapterCodec((SkRawCodec*)codec.release());  in NewFromStream()
111     bool highPrecision = fCodec->getEncodedInfo().bitsPerComponent() > 8;  in computeOutputColorType()
118             // Fall through to kGray_8.  Before kGray_8_SkColorType existed,  in computeOutputColorType()
120             // grayscale decode.  in computeOutputColorType()
122             if (kGray_8_SkColorType == this->getInfo().colorType()) {  in computeOutputColorType()
127             if (kOpaque_SkAlphaType == this->getInfo().alphaType()) {  in computeOutputColorType()
137     // F16 is the Android default for high precision images.  in computeOutputColorType()
142     if (kOpaque_SkAlphaType == this->getInfo().alphaType()) {  in computeOutputAlphaType()
153             // If |prefColorSpace| is supported, choose it.  in computeOutputColorSpace()
159             SkColorSpace* encodedSpace = fCodec->getInfo().colorSpace();  in computeOutputColorSpace()
161                 // Leave the pixels in the encoded color space.  Color space conversion  in computeOutputColorSpace()
162                 // will be handled after decode time.  in computeOutputColorSpace()
174             // Note that |prefColorSpace| is ignored, F16 is always linear sRGB.  in computeOutputColorSpace()
177             // Note that |prefColorSpace| is ignored, 565 is always sRGB.  in computeOutputColorSpace()
180             // Color correction not supported for kGray.  in computeOutputColorSpace()
190     // Fast path for when we are not scaling.  in getSampledDimensions()
192         return fInfo.dimensions();  in getSampledDimensions()
199     if (!desiredSubset || !is_valid_subset(*desiredSubset, fInfo.dimensions())) {  in getSupportedSubset()
211     // We require that the input subset is a subset that is supported by SkAndroidCodec.  in getSampledSubsetDimensions()
212     // We test this by calling getSupportedSubset() and verifying that no modifications  in getSampledSubsetDimensions()
213     // are made to the subset.  in getSampledSubsetDimensions()
219     // If the subset is the entire image, for consistency, use getSampledDimensions().  in getSampledSubsetDimensions()
220     if (fInfo.dimensions() == subset.size()) {  in getSampledSubsetDimensions()
225     // want the same implementation.  in getSampledSubsetDimensions()
226     return {get_scaled_dimension(subset.width(), sampleSize),  in getSampledSubsetDimensions()
227             get_scaled_dimension(subset.height(), sampleSize)};  in getSampledSubsetDimensions()
235     if (rowBytes < info.minRowBytes()) {  in getAndroidPixels()
243         if (!is_valid_subset(*options->fSubset, fInfo.dimensions())) {  in getAndroidPixels()
247         if (SkIRect::MakeSize(fInfo.dimensions()) == *options->fSubset) {  in getAndroidPixels()
248             // The caller wants the whole thing, rather than a subset. Modify  in getAndroidPixels()
250             // a subset.  in getAndroidPixels()
252             defaultOptions.fSubset = nullptr;  in getAndroidPixels()