adding gm to use random scaler context
BUG=skia: Committed: https://skia.googlesource.com/skia/+/853336c532504b3436d7dcbf252419f00c79066d Review URL: https://codereview.chromium.org/1268853008
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gm/textblobrandomfont.cpp
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132
gm/textblobrandomfont.cpp
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "Resources.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkStream.h"
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#include "SkSurface.h"
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#include "SkTextBlob.h"
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#include "SkTypeface.h"
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#include "../src/fonts/SkRandomScalerContext.h"
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#if SK_SUPPORT_GPU
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#include "GrContext.h"
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namespace skiagm {
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class TextBlobRandomFont : public GM {
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public:
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// This gm tests that textblobs can be translated and scaled with a font that returns random
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// but deterministic masks
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TextBlobRandomFont() { }
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protected:
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void onOnceBeforeDraw() override {
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SkTextBlobBuilder builder;
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const char* text = "The quick brown fox jumps over the lazy dog.";
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// make textbloben
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SkPaint paint;
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paint.setTextSize(32);
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paint.setLCDRenderText(true);
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// Setup our random scaler context
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SkAutoTUnref<SkTypeface> orig(sk_tool_utils::create_portable_typeface("sans-serif",
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SkTypeface::kBold));
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if (NULL == orig) {
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orig.reset(SkTypeface::RefDefault());
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}
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SkAutoTUnref<SkTypeface> random(SkNEW_ARGS(SkRandomTypeface, (orig, paint, false)));
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paint.setTypeface(random);
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SkRect bounds;
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paint.measureText(text, strlen(text), &bounds);
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SkScalar yOffset = bounds.height();
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sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, 0);
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// A8
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paint.setSubpixelText(false);
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paint.setLCDRenderText(false);
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sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 32);
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// build
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fBlob.reset(builder.build());
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}
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SkString onShortName() override {
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return SkString("textblobrandomfont");
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}
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SkISize onISize() override {
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return SkISize::Make(kWidth, kHeight);
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}
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void onDraw(SkCanvas* canvas) override {
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// This GM exists to test a specific feature of the GPU backend.
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if (NULL == canvas->getGrContext()) {
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this->drawGpuOnlyMessage(canvas);
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return;
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}
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canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorWHITE));
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SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
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SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
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SkAutoTUnref<SkSurface> surface(canvas->newSurface(info, &props));
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if (surface) {
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SkPaint paint;
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paint.setAntiAlias(true);
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SkCanvas* c = surface->getCanvas();
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int stride = SkScalarCeilToInt(fBlob->bounds().height() / 2) + 10;
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int yOffset = stride;
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for (int i = 0; i < 10; i++) {
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// fiddle the canvas to force regen of textblobs
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canvas->rotate(i % 2 ? 0.0f : -0.05f);
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canvas->drawTextBlob(fBlob, 10.0f, SkIntToScalar(yOffset), paint);
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yOffset += stride;
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// This will draw as black boxes
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c->drawTextBlob(fBlob, 10, SkIntToScalar(yOffset), paint);
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surface->draw(canvas, 0, 0, nullptr);
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// free gpu resources and verify
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yOffset += stride;
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canvas->getGrContext()->freeGpuResources();
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canvas->drawTextBlob(fBlob, 10, SkIntToScalar(yOffset), paint);
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yOffset += stride;
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}
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} else {
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const char* text = "This test requires a surface";
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size_t len = strlen(text);
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SkPaint paint;
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canvas->drawText(text, len, 10, 100, paint);
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}
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}
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private:
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SkAutoTUnref<const SkTextBlob> fBlob;
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static const int kWidth = 1000;
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static const int kHeight = 1000;
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM( return SkNEW(TextBlobRandomFont); )
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}
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#endif
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@ -28,7 +28,6 @@ protected:
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private:
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SkRandomTypeface* fFace;
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SkScalerContext* fProxy;
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SkMatrix fMatrix;
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bool fFakeIt;
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};
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@ -41,28 +40,7 @@ SkRandomScalerContext::SkRandomScalerContext(SkRandomTypeface* face, const SkDes
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: SkScalerContext(face, desc)
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, fFace(face)
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, fFakeIt(fakeIt) {
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size_t descSize = SkDescriptor::ComputeOverhead(1) + sizeof(SkScalerContext::Rec);
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SkAutoDescriptor ad(descSize);
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SkDescriptor* newDesc = ad.getDesc();
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newDesc->init();
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void* entry = newDesc->addEntry(kRec_SkDescriptorTag,
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sizeof(SkScalerContext::Rec), &fRec);
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{
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SkScalerContext::Rec* rec = (SkScalerContext::Rec*)entry;
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rec->fTextSize = STD_SIZE;
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rec->fPreScaleX = SK_Scalar1;
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rec->fPreSkewX = 0;
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rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1;
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rec->fPost2x2[1][0] = rec->fPost2x2[0][1] = 0;
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}
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SkASSERT(descSize == newDesc->getLength());
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newDesc->computeChecksum();
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fProxy = face->proxy()->createScalerContext(newDesc);
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fRec.getSingleMatrix(&fMatrix);
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fMatrix.preScale(SK_Scalar1 / STD_SIZE, SK_Scalar1 / STD_SIZE);
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fProxy = face->proxy()->createScalerContext(desc);
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}
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SkRandomScalerContext::~SkRandomScalerContext() {
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@ -79,12 +57,6 @@ uint16_t SkRandomScalerContext::generateCharToGlyph(SkUnichar uni) {
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void SkRandomScalerContext::generateAdvance(SkGlyph* glyph) {
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fProxy->getAdvance(glyph);
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SkVector advance;
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fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
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SkFixedToScalar(glyph->fAdvanceY), &advance);
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glyph->fAdvanceX = SkScalarToFixed(advance.fX);
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glyph->fAdvanceY = SkScalarToFixed(advance.fY);
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}
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void SkRandomScalerContext::generateMetrics(SkGlyph* glyph) {
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@ -110,15 +82,8 @@ void SkRandomScalerContext::generateMetrics(SkGlyph* glyph) {
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return;
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}
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if (SkMask::kARGB32_Format == format) {
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SkVector advance;
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fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
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SkFixedToScalar(glyph->fAdvanceY), &advance);
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glyph->fAdvanceX = SkScalarToFixed(advance.fX);
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glyph->fAdvanceY = SkScalarToFixed(advance.fY);
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SkPath path;
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fProxy->getPath(*glyph, &path);
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path.transform(fMatrix);
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SkRect storage;
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const SkPaint& paint = fFace->paint();
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@ -195,7 +160,6 @@ void SkRandomScalerContext::generateImage(const SkGlyph& glyph) {
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SkCanvas canvas(bm);
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canvas.translate(-SkIntToScalar(glyph.fLeft),
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-SkIntToScalar(glyph.fTop));
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canvas.concat(fMatrix);
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canvas.drawPath(path, fFace->paint());
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} else {
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fProxy->forceGenerateImageFromPath();
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@ -209,23 +173,10 @@ void SkRandomScalerContext::generateImage(const SkGlyph& glyph) {
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void SkRandomScalerContext::generatePath(const SkGlyph& glyph, SkPath* path) {
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fProxy->getPath(glyph, path);
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path->transform(fMatrix);
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}
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void SkRandomScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
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fProxy->getFontMetrics(metrics);
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if (metrics) {
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SkScalar scale = fMatrix.getScaleY();
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metrics->fTop = SkScalarMul(metrics->fTop, scale);
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metrics->fAscent = SkScalarMul(metrics->fAscent, scale);
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metrics->fDescent = SkScalarMul(metrics->fDescent, scale);
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metrics->fBottom = SkScalarMul(metrics->fBottom, scale);
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metrics->fLeading = SkScalarMul(metrics->fLeading, scale);
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metrics->fAvgCharWidth = SkScalarMul(metrics->fAvgCharWidth, scale);
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metrics->fXMin = SkScalarMul(metrics->fXMin, scale);
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metrics->fXMax = SkScalarMul(metrics->fXMax, scale);
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metrics->fXHeight = SkScalarMul(metrics->fXHeight, scale);
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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