1 /*
2 * Copyright 2017 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColorSpace.h"
11 #include "include/core/SkData.h"
12 #include "include/core/SkImage.h"
13 #include "include/core/SkImageInfo.h"
14 #include "include/core/SkPixmap.h"
15 #include "include/core/SkRefCnt.h"
16 #include "include/core/SkSize.h"
17 #include "include/core/SkStream.h"
18 #include "include/core/SkString.h"
19 #include "include/core/SkTypes.h"
20 #include "include/encode/SkJpegEncoder.h"
21 #include "include/private/base/SkTemplates.h"
22 #include "tools/Resources.h"
23
24 using namespace skia_private;
25
26 namespace skiagm {
27
read_into_pixmap(SkPixmap * dst,SkImageInfo dstInfo,void * dstPixels,sk_sp<SkImage> src)28 static inline void read_into_pixmap(SkPixmap* dst, SkImageInfo dstInfo, void* dstPixels,
29 sk_sp<SkImage> src) {
30 dst->reset(dstInfo, dstPixels, dstInfo.minRowBytes());
31 src->readPixels(nullptr, *dst, 0, 0, SkImage::CachingHint::kDisallow_CachingHint);
32 }
33
encode_pixmap_and_make_image(const SkPixmap & src,SkJpegEncoder::AlphaOption alphaOption)34 static inline sk_sp<SkImage> encode_pixmap_and_make_image(const SkPixmap& src,
35 SkJpegEncoder::AlphaOption alphaOption) {
36 SkDynamicMemoryWStream dst;
37 SkJpegEncoder::Options options;
38 options.fAlphaOption = alphaOption;
39 SkJpegEncoder::Encode(&dst, src, options);
40 return SkImage::MakeFromEncoded(dst.detachAsData());
41 }
42
43 class EncodeJpegAlphaOptsGM : public GM {
44 public:
EncodeJpegAlphaOptsGM()45 EncodeJpegAlphaOptsGM() {}
46
47 protected:
onShortName()48 SkString onShortName() override {
49 return SkString("encode-alpha-jpeg");
50 }
51
onISize()52 SkISize onISize() override {
53 return SkISize::Make(400, 200);
54 }
55
onDraw(SkCanvas * canvas,SkString * errorMsg)56 DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
57 sk_sp<SkImage> srcImg = GetResourceAsImage("images/rainbow-gradient.png");
58 if (!srcImg) {
59 *errorMsg = "Could not load images/rainbow-gradient.png. "
60 "Did you forget to set the resourcePath?";
61 return DrawResult::kFail;
62 }
63 fStorage.reset(srcImg->width() * srcImg->height() *
64 SkColorTypeBytesPerPixel(kRGBA_F16_SkColorType));
65
66 SkPixmap src;
67 SkImageInfo info = SkImageInfo::MakeN32Premul(srcImg->width(), srcImg->height(),
68 canvas->imageInfo().colorSpace() ? SkColorSpace::MakeSRGB() : nullptr);
69 read_into_pixmap(&src, info, fStorage.get(), srcImg);
70
71 // Encode 8888 premul.
72 auto img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
73 auto img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
74 canvas->drawImage(img0, 0.0f, 0.0f);
75 canvas->drawImage(img1, 0.0f, 100.0f);
76
77 // Encode 8888 unpremul
78 info = info.makeAlphaType(kUnpremul_SkAlphaType);
79 read_into_pixmap(&src, info, fStorage.get(), srcImg);
80 img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
81 img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
82 canvas->drawImage(img0, 100.0f, 0.0f);
83 canvas->drawImage(img1, 100.0f, 100.0f);
84
85 // Encode F16 premul
86 info = SkImageInfo::Make(srcImg->width(), srcImg->height(), kRGBA_F16_SkColorType,
87 kPremul_SkAlphaType, SkColorSpace::MakeSRGB());
88 read_into_pixmap(&src, info, fStorage.get(), srcImg);
89 img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
90 img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
91 canvas->drawImage(img0, 200.0f, 0.0f);
92 canvas->drawImage(img1, 200.0f, 100.0f);
93
94 // Encode F16 unpremul
95 info = info.makeAlphaType(kUnpremul_SkAlphaType);
96 read_into_pixmap(&src, info, fStorage.get(), srcImg);
97 img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
98 img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
99 canvas->drawImage(img0, 300.0f, 0.0f);
100 canvas->drawImage(img1, 300.0f, 100.0f);
101
102 return DrawResult::kOk;
103 }
104
105 private:
106 AutoTMalloc<uint8_t> fStorage;
107
108 using INHERITED = GM;
109 };
110
111 DEF_GM( return new EncodeJpegAlphaOptsGM; )
112
113 } // namespace skiagm
114
