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Side by Side Diff: gm/textblobcolortrans.cpp

Issue 1076593002: Start canonicalizing color for all A8 textblobs (Closed) Base URL: https://skia.googlesource.com/skia.git@atcachemasks
Patch Set: adding gm Created 5 years, 8 months ago
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1 /*
2 * Copyright 2015 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
10 #include "Resources.h"
11 #include "SkCanvas.h"
12 #include "SkGradientShader.h"
13 #include "SkStream.h"
14 #include "SkTextBlob.h"
15 #include "SkTypeface.h"
16
17 namespace skiagm {
18
19 static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
bsalomon 2015/04/13 15:16:38 This looks familiar... should we add this to some
20 SkScalar x, SkScalar y) {
21 SkPaint paint(origPaint);
22 SkTDArray<uint16_t> glyphs;
23
24 size_t len = strlen(text);
25 glyphs.append(paint.textToGlyphs(text, len, NULL));
26 paint.textToGlyphs(text, len, glyphs.begin());
27
28 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
29 const SkTextBlobBuilder::RunBuffer& run = builder->allocRun(paint, glyphs.co unt(), x, y,
30 NULL);
31 memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
32 }
33
34 class TextBlobColorTrans : public GM {
bsalomon 2015/04/13 15:16:38 // This GM tests some stuff about gamma text blah
35 public:
36 TextBlobColorTrans() { }
37
38 protected:
39 void onOnceBeforeDraw() override {
40 SkTextBlobBuilder builder;
41
42 // make textblob
43 // Text so large we draw as paths. This is mostly done to trigger atlas eviction on small
44 // atlases
45 SkPaint paint;
46 paint.setTextSize(384);
47 const char* text = "AB";
48 sk_tool_utils::set_portable_typeface(&paint);
49
50 SkRect bounds;
51 paint.measureText(text, strlen(text), &bounds);
52
53 SkScalar yOffset = bounds.height();
54 add_to_text_blob(&builder, text, paint, 0, yOffset - 30);
55
56 // A8
57 paint.setTextSize(28);
58 text = "The quick brown fox jumps over the lazy dog.";
59 paint.setSubpixelText(false);
60 paint.setLCDRenderText(false);
61 paint.measureText(text, strlen(text), &bounds);
62 add_to_text_blob(&builder, text, paint, 0, yOffset - 8);
63
64 // build
65 fBlob.reset(builder.build());
66 }
67
68 SkString onShortName() override {
69 return SkString("textblobcolortrans");
70 }
71
72 SkISize onISize() override {
73 return SkISize::Make(kWidth, kHeight);
74 }
75
76 void onDraw(SkCanvas* canvas) override {
77
78 canvas->drawColor(SK_ColorGRAY);
79
80 SkPaint paint;
81 canvas->translate(10, 40);
82
83 SkRect bounds = fBlob->bounds();
84
85 // Colors were chosen to map to pairs of canonical colors
bsalomon 2015/04/13 15:16:38 not obvious to me what canonical colors are.
86 SkColor colors[] = {SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorYELLOW, SK_Col orWHITE};
87
88 size_t count = SK_ARRAY_COUNT(colors);
89 size_t colorIndex = 0;
90 for (int y = 0; y + SkScalarFloorToInt(bounds.height()) < kHeight;
91 y += SkScalarFloorToInt(bounds.height())) {
92 paint.setColor(colors[colorIndex++ % count]);
93 canvas->save();
94 canvas->translate(0, SkIntToScalar(y));
95 canvas->drawTextBlob(fBlob, 0, 0, paint);
96 canvas->restore();
97 }
98 }
99
100 private:
101 SkAutoTUnref<const SkTextBlob> fBlob;
102
103 static const int kWidth = 675;
104 static const int kHeight = 1600;
105
106 typedef GM INHERITED;
107 };
108
109 //////////////////////////////////////////////////////////////////////////////
110
111 DEF_GM( return SkNEW(TextBlobColorTrans); )
112 }
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