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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkPoint.h"
#include "SkTextBlob.h"
#include "SkTDArray.h"
namespace {
enum Pos {
kDefault_Pos = 0,
kScalar_Pos = 1,
kPoint_Pos = 2,
};
const struct BlobCfg {
unsigned count;
Pos pos;
SkScalar scale;
} blobConfigs[][3][3] = {
{
{ { 1024, kDefault_Pos, 1 }, { 0, kDefault_Pos, 0 }, { 0, kDefault_Pos, 0 } },
{ { 1024, kScalar_Pos, 1 }, { 0, kScalar_Pos, 0 }, { 0, kScalar_Pos, 0 } },
{ { 1024, kPoint_Pos, 1 }, { 0, kPoint_Pos, 0 }, { 0, kPoint_Pos, 0 } },
},
{
{ { 4, kDefault_Pos, 1 }, { 4, kDefault_Pos, 1 }, { 4, kDefault_Pos, 1 } },
{ { 4, kScalar_Pos, 1 }, { 4, kScalar_Pos, 1 }, { 4, kScalar_Pos, 1 } },
{ { 4, kPoint_Pos, 1 }, { 4, kPoint_Pos, 1 }, { 4, kPoint_Pos, 1 } },
},
{
{ { 4, kDefault_Pos, 1 }, { 4, kDefault_Pos, 1 }, { 4, kScalar_Pos, 1 } },
{ { 4, kScalar_Pos, 1 }, { 4, kScalar_Pos, 1 }, { 4, kPoint_Pos, 1 } },
{ { 4, kPoint_Pos, 1 }, { 4, kPoint_Pos, 1 }, { 4, kDefault_Pos, 1 } },
},
{
{ { 4, kDefault_Pos, 1 }, { 4, kScalar_Pos, 1 }, { 4, kPoint_Pos, 1 } },
{ { 4, kScalar_Pos, 1 }, { 4, kPoint_Pos, 1 }, { 4, kDefault_Pos, 1 } },
{ { 4, kPoint_Pos, 1 }, { 4, kDefault_Pos, 1 }, { 4, kScalar_Pos, 1 } },
},
{
{ { 4, kDefault_Pos, .75f }, { 4, kDefault_Pos, 1 }, { 4, kScalar_Pos, 1.25f } },
{ { 4, kScalar_Pos, .75f }, { 4, kScalar_Pos, 1 }, { 4, kPoint_Pos, 1.25f } },
{ { 4, kPoint_Pos, .75f }, { 4, kPoint_Pos, 1 }, { 4, kDefault_Pos, 1.25f } },
},
{
{ { 4, kDefault_Pos, 1 }, { 4, kScalar_Pos, .75f }, { 4, kPoint_Pos, 1.25f } },
{ { 4, kScalar_Pos, 1 }, { 4, kPoint_Pos, .75f }, { 4, kDefault_Pos, 1.25f } },
{ { 4, kPoint_Pos, 1 }, { 4, kDefault_Pos, .75f }, { 4, kScalar_Pos, 1.25f } },
},
};
const SkScalar kFontSize = 16;
}
class TextBlobGM : public skiagm::GM {
public:
TextBlobGM(const char* txt)
: fText(txt) {
}
protected:
void onOnceBeforeDraw() override {
fTypeface = sk_tool_utils::create_portable_typeface("serif", SkFontStyle());
SkPaint p;
p.setTypeface(fTypeface);
size_t txtLen = strlen(fText);
int glyphCount = p.textToGlyphs(fText, txtLen, nullptr);
fGlyphs.append(glyphCount);
p.textToGlyphs(fText, txtLen, fGlyphs.begin());
}
SkString onShortName() override {
return SkString("textblob");
}
SkISize onISize() override {
return SkISize::Make(640, 480);
}
void onDraw(SkCanvas* canvas) override {
for (unsigned b = 0; b < SK_ARRAY_COUNT(blobConfigs); ++b) {
SkAutoTUnref<const SkTextBlob> blob(this->makeBlob(b));
SkPaint p;
SkPoint offset = SkPoint::Make(SkIntToScalar(10 + 300 * (b % 2)),
SkIntToScalar(20 + 150 * (b / 2)));
canvas->drawTextBlob(blob, offset.x(), offset.y(), p);
p.setColor(SK_ColorBLUE);
p.setStyle(SkPaint::kStroke_Style);
SkRect box = blob->bounds();
box.offset(offset);
canvas->drawRect(box, p);
}
}
private:
const SkTextBlob* makeBlob(unsigned blobIndex) {
SkTextBlobBuilder builder;
SkPaint font;
font.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
font.setAntiAlias(true);
font.setSubpixelText(true);
font.setTypeface(fTypeface);
for (unsigned l = 0; l < SK_ARRAY_COUNT(blobConfigs[blobIndex]); ++l) {
unsigned currentGlyph = 0;
for (unsigned c = 0; c < SK_ARRAY_COUNT(blobConfigs[blobIndex][l]); ++c) {
const BlobCfg* cfg = &blobConfigs[blobIndex][l][c];
unsigned count = cfg->count;
if (count > fGlyphs.count() - currentGlyph) {
count = fGlyphs.count() - currentGlyph;
}
if (0 == count) {
break;
}
font.setTextSize(kFontSize * cfg->scale);
const SkScalar advanceX = font.getTextSize() * 0.85f;
const SkScalar advanceY = font.getTextSize() * 1.5f;
SkPoint offset = SkPoint::Make(currentGlyph * advanceX + c * advanceX,
advanceY * l);
switch (cfg->pos) {
case kDefault_Pos: {
const SkTextBlobBuilder::RunBuffer& buf = builder.allocRun(font, count,
offset.x(),
offset.y());
memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
} break;
case kScalar_Pos: {
const SkTextBlobBuilder::RunBuffer& buf = builder.allocRunPosH(font, count,
offset.y());
SkTDArray<SkScalar> pos;
for (unsigned i = 0; i < count; ++i) {
*pos.append() = offset.x() + i * advanceX;
}
memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
memcpy(buf.pos, pos.begin(), count * sizeof(SkScalar));
} break;
case kPoint_Pos: {
const SkTextBlobBuilder::RunBuffer& buf = builder.allocRunPos(font, count);
SkTDArray<SkScalar> pos;
for (unsigned i = 0; i < count; ++i) {
*pos.append() = offset.x() + i * advanceX;
*pos.append() = offset.y() + i * (advanceY / count);
}
memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
memcpy(buf.pos, pos.begin(), count * sizeof(SkScalar) * 2);
} break;
default:
SK_ABORT("unhandled pos value");
}
currentGlyph += count;
}
}
return builder.build();
}
SkTDArray<uint16_t> fGlyphs;
sk_sp<SkTypeface> fTypeface;
const char* fText;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new TextBlobGM("hamburgefons");)
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