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/*
* Copyright 2017 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"
#if SK_SUPPORT_ATLAS_TEXT
#include "GrContext.h"
#include "SkAtlasTextContext.h"
#include "SkAtlasTextFont.h"
#include "SkAtlasTextTarget.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkTypeface.h"
#include "SkUtils.h"
#include "gpu/TestContext.h"
#include "gpu/atlastext/GLTestAtlasTextRenderer.h"
#include "gpu/atlastext/TestAtlasTextRenderer.h"
#include "sk_tool_utils.h"
// GM that draws text using the Atlas Text interface offscreen and then blits that to the canvas.
static SkScalar draw_string(SkAtlasTextTarget* target, const SkString& text, SkScalar x, SkScalar y,
uint32_t color, sk_sp<SkTypeface> typeface, float size) {
if (!text.size()) {
return x;
}
auto font = SkAtlasTextFont::Make(typeface, size);
int cnt = SkUTF::CountUTF8(text.c_str(), text.size());
std::unique_ptr<SkGlyphID[]> glyphs(new SkGlyphID[cnt]);
typeface->charsToGlyphs(text.c_str(), SkTypeface::Encoding::kUTF8_Encoding, glyphs.get(), cnt);
// Using a paint to get the positions for each glyph.
SkPaint paint;
paint.setTextSize(size);
paint.setTypeface(std::move(typeface));
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
std::unique_ptr<SkScalar[]> widths(new SkScalar[cnt]);
paint.getTextWidths(glyphs.get(), cnt * sizeof(SkGlyphID), widths.get(), nullptr);
std::unique_ptr<SkPoint[]> positions(new SkPoint[cnt]);
positions[0] = {x, y};
for (int i = 1; i < cnt; ++i) {
positions[i] = {positions[i - 1].fX + widths[i - 1], y};
}
target->drawText(glyphs.get(), positions.get(), cnt, color, *font);
// Return the width of the of draw.
return positions[cnt - 1].fX + widths[cnt - 1] - positions[0].fX;
}
class AtlasTextGM : public skiagm::GM {
public:
AtlasTextGM() = default;
protected:
SkString onShortName() override { return SkString("atlastext"); }
SkISize onISize() override { return SkISize::Make(kSize, kSize); }
void onOnceBeforeDraw() override {
fRenderer = sk_gpu_test::MakeGLTestAtlasTextRenderer();
if (!fRenderer) {
return;
}
fContext = SkAtlasTextContext::Make(fRenderer);
auto targetHandle = fRenderer->makeTargetHandle(kSize, kSize);
if (!targetHandle) {
return;
}
fTarget = SkAtlasTextTarget::Make(fContext, kSize, kSize, targetHandle);
fTypefaces[0] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Italic());
fTypefaces[1] =
sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Italic());
fTypefaces[2] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Normal());
fTypefaces[3] =
sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Normal());
fTypefaces[4] = sk_tool_utils::create_portable_typeface("serif", SkFontStyle::Bold());
fTypefaces[5] = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Bold());
}
void onDraw(SkCanvas* canvas) override {
if (!fRenderer || !fTarget || !fTarget->handle()) {
canvas->clear(SK_ColorRED);
return;
}
fRenderer->clearTarget(fTarget->handle(), 0xFF808080);
auto bmp = this->drawText();
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
canvas->drawBitmap(bmp, 0, 0);
}
private:
SkBitmap drawText() {
static const int kSizes[] = {8, 13, 18, 23, 30};
static const SkString kTexts[] = {SkString("ABCDEFGHIJKLMNOPQRSTUVWXYZ"),
SkString("abcdefghijklmnopqrstuvwxyz"),
SkString("0123456789"),
SkString("!@#$%^&*()<>[]{}")};
SkScalar x = 0;
SkScalar y = 10;
SkRandom random;
do {
for (auto s : kSizes) {
auto size = 2 * s;
for (const auto& typeface : fTypefaces) {
for (const auto& text : kTexts) {
// Choose a random color but don't let alpha be too small to see.
uint32_t color = random.nextU() | 0x40000000;
fTarget->save();
// Randomly add a little bit of perspective
if (random.nextBool()) {
SkMatrix persp;
persp.reset();
persp.setPerspY(0.0005f);
persp.preTranslate(-x, -y + s);
persp.postTranslate(x, y - s);
fTarget->concat(persp);
}
// Randomly switch between positioning with a matrix vs x, y passed to draw.
SkScalar drawX = x, drawY = y;
if (random.nextBool()) {
fTarget->translate(x, y);
drawX = drawY = 0;
}
x += size +
draw_string(fTarget.get(), text, drawX, drawY, color, typeface, size);
x = SkScalarCeilToScalar(x);
fTarget->restore();
// Flush periodically to test continued drawing after a flush.
if ((random.nextU() % 8) == 0) {
fTarget->flush();
}
if (x + 100 > kSize) {
x = 0;
y += SkScalarCeilToScalar(size + 3);
if (y > kSize) {
fTarget->flush();
return fRenderer->readTargetHandle(fTarget->handle());
}
}
}
}
}
} while (true);
}
static constexpr int kSize = 1280;
sk_sp<SkTypeface> fTypefaces[6];
sk_sp<sk_gpu_test::TestAtlasTextRenderer> fRenderer;
std::unique_ptr<SkAtlasTextTarget> fTarget;
sk_sp<SkAtlasTextContext> fContext;
typedef GM INHERITED;
};
constexpr int AtlasTextGM::kSize;
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new AtlasTextGM;)
#endif
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