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.h"
9 #include "SkImage.h"
10 #include "SkImageInfoPriv.h"
11 #include "SkJpegEncoder.h"
12
13 #include "Resources.h"
14
15 namespace skiagm {
16
read_into_pixmap(SkPixmap * dst,SkImageInfo dstInfo,void * dstPixels,sk_sp<SkImage> src)17 static inline void read_into_pixmap(SkPixmap* dst, SkImageInfo dstInfo, void* dstPixels,
18 sk_sp<SkImage> src) {
19 dst->reset(dstInfo, dstPixels, dstInfo.minRowBytes());
20 src->readPixels(*dst, 0, 0, SkImage::CachingHint::kDisallow_CachingHint);
21 }
22
encode_pixmap_and_make_image(const SkPixmap & src,SkJpegEncoder::AlphaOption alphaOption)23 static inline sk_sp<SkImage> encode_pixmap_and_make_image(const SkPixmap& src,
24 SkJpegEncoder::AlphaOption alphaOption) {
25 SkDynamicMemoryWStream dst;
26 SkJpegEncoder::Options options;
27 options.fAlphaOption = alphaOption;
28 SkJpegEncoder::Encode(&dst, src, options);
29 return SkImage::MakeFromEncoded(dst.detachAsData());
30 }
31
32 class EncodeJpegAlphaOptsGM : public GM {
33 public:
EncodeJpegAlphaOptsGM()34 EncodeJpegAlphaOptsGM() {}
35
36 protected:
onShortName()37 SkString onShortName() override {
38 return SkString("encode-alpha-jpeg");
39 }
40
onISize()41 SkISize onISize() override {
42 return SkISize::Make(400, 200);
43 }
44
onDraw(SkCanvas * canvas,SkString * errorMsg)45 DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
46 sk_sp<SkImage> srcImg = GetResourceAsImage("images/rainbow-gradient.png");
47 if (!srcImg) {
48 *errorMsg = "Could not load images/rainbow-gradient.png. "
49 "Did you forget to set the resourcePath?";
50 return DrawResult::kFail;
51 }
52 fStorage.reset(srcImg->width() * srcImg->height() *
53 SkColorTypeBytesPerPixel(kRGBA_F16_SkColorType));
54
55 SkPixmap src;
56 SkImageInfo info = SkImageInfo::MakeN32Premul(srcImg->width(), srcImg->height(),
57 canvas->imageInfo().colorSpace() ? SkColorSpace::MakeSRGB() : nullptr);
58 read_into_pixmap(&src, info, fStorage.get(), srcImg);
59
60 // Encode 8888 premul.
61 auto img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
62 auto img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
63 canvas->drawImage(img0, 0.0f, 0.0f);
64 canvas->drawImage(img1, 0.0f, 100.0f);
65
66 // Encode 8888 unpremul
67 info = info.makeAlphaType(kUnpremul_SkAlphaType);
68 read_into_pixmap(&src, info, fStorage.get(), srcImg);
69 img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
70 img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
71 canvas->drawImage(img0, 100.0f, 0.0f);
72 canvas->drawImage(img1, 100.0f, 100.0f);
73
74 // Encode F16 premul
75 info = SkImageInfo::Make(srcImg->width(), srcImg->height(), kRGBA_F16_SkColorType,
76 kPremul_SkAlphaType, SkColorSpace::MakeSRGB());
77 read_into_pixmap(&src, info, fStorage.get(), srcImg);
78 img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
79 img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
80 canvas->drawImage(img0, 200.0f, 0.0f);
81 canvas->drawImage(img1, 200.0f, 100.0f);
82
83 // Encode F16 unpremul
84 info = info.makeAlphaType(kUnpremul_SkAlphaType);
85 read_into_pixmap(&src, info, fStorage.get(), srcImg);
86 img0 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kIgnore);
87 img1 = encode_pixmap_and_make_image(src, SkJpegEncoder::AlphaOption::kBlendOnBlack);
88 canvas->drawImage(img0, 300.0f, 0.0f);
89 canvas->drawImage(img1, 300.0f, 100.0f);
90
91 return DrawResult::kOk;
92 }
93
94 private:
95 SkAutoTMalloc<uint8_t> fStorage;
96
97 typedef GM INHERITED;
98 };
99
100 DEF_GM( return new EncodeJpegAlphaOptsGM; )
101
102 };
103
