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/*
* Copyright 2015 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 "Resources.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkImage.h"
#include "SkRandom.h"
#include "SkStream.h"
#include "SkSurface.h"
#include "SkTextBlob.h"
#include "SkTypeface.h"
namespace skiagm {
class TextBlobMixedSizes : public GM {
public:
// This gm tests that textblobs of mixed sizes with a large glyph will render properly
TextBlobMixedSizes(bool useDFT) : fUseDFT(useDFT) {}
protected:
void onOnceBeforeDraw() override {
SkTextBlobBuilder builder;
// make textblob. To stress distance fields, we choose sizes appropriately
SkPaint paint;
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setLCDRenderText(true);
paint.setTypeface(MakeResourceAsTypeface("/fonts/HangingS.ttf"));
const char* text = "Skia";
// extra large
paint.setTextSize(262);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, 0);
// large
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
SkScalar yOffset = bounds.height();
paint.setTextSize(162);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset);
// Medium
paint.measureText(text, strlen(text), &bounds);
yOffset += bounds.height();
paint.setTextSize(72);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset);
// Small
paint.measureText(text, strlen(text), &bounds);
yOffset += bounds.height();
paint.setTextSize(32);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset);
// micro (will fall out of distance field text even if distance field text is enabled)
paint.measureText(text, strlen(text), &bounds);
yOffset += bounds.height();
paint.setTextSize(14);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset);
// Zero size.
paint.measureText(text, strlen(text), &bounds);
yOffset += bounds.height();
paint.setTextSize(0);
sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset);
// build
fBlob = builder.make();
}
SkString onShortName() override {
SkString name("textblobmixedsizes");
if (fUseDFT) {
name.appendf("_df");
}
return name;
}
SkISize onISize() override {
return SkISize::Make(kWidth, kHeight);
}
void onDraw(SkCanvas* inputCanvas) override {
SkCanvas* canvas = inputCanvas;
sk_sp<SkSurface> surface;
if (fUseDFT) {
#if SK_SUPPORT_GPU
// Create a new Canvas to enable DFT
GrContext* ctx = inputCanvas->getGrContext();
SkISize size = onISize();
sk_sp<SkColorSpace> colorSpace = sk_ref_sp(inputCanvas->imageInfo().colorSpace());
SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(),
kPremul_SkAlphaType, colorSpace);
SkSurfaceProps props(SkSurfaceProps::kUseDeviceIndependentFonts_Flag,
SkSurfaceProps::kLegacyFontHost_InitType);
surface = SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0, &props);
canvas = surface.get() ? surface->getCanvas() : inputCanvas;
// init our new canvas with the old canvas's matrix
canvas->setMatrix(inputCanvas->getTotalMatrix());
#endif
}
canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorWHITE));
SkRect bounds = fBlob->bounds();
const int kPadX = SkScalarFloorToInt(bounds.width() / 3);
const int kPadY = SkScalarFloorToInt(bounds.height() / 3);
int rowCount = 0;
canvas->translate(SkIntToScalar(kPadX), SkIntToScalar(kPadY));
canvas->save();
SkRandom random;
SkPaint paint;
if (!fUseDFT) {
paint.setColor(sk_tool_utils::color_to_565(SK_ColorWHITE));
}
paint.setAntiAlias(false);
const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(8));
// setup blur paint
SkPaint blurPaint(paint);
blurPaint.setColor(sk_tool_utils::color_to_565(SK_ColorBLACK));
blurPaint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, kSigma));
for (int i = 0; i < 4; i++) {
canvas->save();
switch (i % 2) {
case 0:
canvas->rotate(random.nextF() * 45.f);
break;
case 1:
canvas->rotate(-random.nextF() * 45.f);
break;
}
if (!fUseDFT) {
canvas->drawTextBlob(fBlob, 0, 0, blurPaint);
}
canvas->drawTextBlob(fBlob, 0, 0, paint);
canvas->restore();
canvas->translate(bounds.width() + SK_Scalar1 * kPadX, 0);
++rowCount;
if ((bounds.width() + 2 * kPadX) * rowCount > kWidth) {
canvas->restore();
canvas->translate(0, bounds.height() + SK_Scalar1 * kPadY);
canvas->save();
rowCount = 0;
}
}
canvas->restore();
#if SK_SUPPORT_GPU
// render offscreen buffer
if (surface) {
SkAutoCanvasRestore acr(inputCanvas, true);
// since we prepended this matrix already, we blit using identity
inputCanvas->resetMatrix();
inputCanvas->drawImage(surface->makeImageSnapshot().get(), 0, 0, nullptr);
}
#endif
}
private:
sk_sp<SkTextBlob> fBlob;
static constexpr int kWidth = 2100;
static constexpr int kHeight = 1900;
bool fUseDFT;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new TextBlobMixedSizes(false); )
#if SK_SUPPORT_GPU
DEF_GM( return new TextBlobMixedSizes(true); )
#endif
}
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