| /* |
| * 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/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorSpace.h" |
| #include "include/core/SkFont.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkSurfaceProps.h" |
| #include "include/core/SkTextBlob.h" |
| #include "include/core/SkTypes.h" |
| #include "include/private/base/SkTArray.h" |
| #include "tools/ToolUtils.h" |
| |
| #include <initializer_list> |
| |
| /** |
| * This GM tests reusing the same text blobs with distance fields rendering using various |
| * combinations of perspective and non-perspetive matrices, scissor clips, and different x,y params |
| * passed to the draw. |
| */ |
| class DFTextBlobPerspGM : public skiagm::GM { |
| public: |
| DFTextBlobPerspGM() { this->setBGColor(0xFFFFFFFF); } |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("dftext_blob_persp"); |
| } |
| |
| SkISize onISize() override { return SkISize::Make(900, 350); } |
| |
| void onOnceBeforeDraw() override { |
| for (int i = 0; i < 3; ++i) { |
| SkFont font; |
| font.setSize(32); |
| font.setEdging(i == 0 ? SkFont::Edging::kAlias : |
| (i == 1 ? SkFont::Edging::kAntiAlias : |
| SkFont::Edging::kSubpixelAntiAlias)); |
| font.setSubpixel(true); |
| SkTextBlobBuilder builder; |
| ToolUtils::add_to_text_blob(&builder, "SkiaText", font, 0, 0); |
| fBlobs.emplace_back(builder.make()); |
| } |
| } |
| |
| void onDraw(SkCanvas* inputCanvas) override { |
| // set up offscreen rendering with distance field text |
| auto ctx = inputCanvas->recordingContext(); |
| SkISize size = this->onISize(); |
| if (!inputCanvas->getBaseLayerSize().isEmpty()) { |
| size = inputCanvas->getBaseLayerSize(); |
| } |
| SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType, |
| inputCanvas->imageInfo().refColorSpace()); |
| SkSurfaceProps inputProps; |
| inputCanvas->getProps(&inputProps); |
| SkSurfaceProps props(SkSurfaceProps::kUseDeviceIndependentFonts_Flag | inputProps.flags(), |
| inputProps.pixelGeometry()); |
| auto surface = SkSurface::MakeRenderTarget(ctx, skgpu::Budgeted::kNo, info, 0, &props); |
| SkCanvas* canvas = surface ? surface->getCanvas() : inputCanvas; |
| // init our new canvas with the old canvas's matrix |
| canvas->setMatrix(inputCanvas->getLocalToDeviceAs3x3()); |
| SkScalar x = 0, y = 0; |
| SkScalar maxH = 0; |
| for (auto twm : {TranslateWithMatrix::kNo, TranslateWithMatrix::kYes}) { |
| for (auto pm : {PerspMode::kNone, PerspMode::kX, PerspMode::kY, PerspMode::kXY}) { |
| for (auto& blob : fBlobs) { |
| for (bool clip : {false, true}) { |
| canvas->save(); |
| SkScalar w = blob->bounds().width(); |
| SkScalar h = blob->bounds().height(); |
| if (clip) { |
| auto rect = |
| SkRect::MakeXYWH(x + 5, y + 5, w * 3.f / 4.f, h * 3.f / 4.f); |
| canvas->clipRect(rect, false); |
| } |
| this->drawBlob(canvas, blob.get(), SK_ColorBLACK, x, y + h, pm, twm); |
| x += w + 20.f; |
| maxH = std::max(h, maxH); |
| canvas->restore(); |
| } |
| } |
| x = 0; |
| y += maxH + 20.f; |
| maxH = 0; |
| } |
| } |
| // 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); |
| } |
| } |
| |
| private: |
| enum class PerspMode { kNone, kX, kY, kXY }; |
| |
| enum class TranslateWithMatrix : bool { kNo, kYes }; |
| |
| void drawBlob(SkCanvas* canvas, SkTextBlob* blob, SkColor color, SkScalar x, SkScalar y, |
| PerspMode perspMode, TranslateWithMatrix translateWithMatrix) { |
| canvas->save(); |
| SkMatrix persp = SkMatrix::I(); |
| switch (perspMode) { |
| case PerspMode::kNone: |
| break; |
| case PerspMode::kX: |
| persp.setPerspX(0.005f); |
| break; |
| case PerspMode::kY: |
| persp.setPerspY(00.005f); |
| break; |
| case PerspMode::kXY: |
| persp.setPerspX(-0.001f); |
| persp.setPerspY(-0.0015f); |
| break; |
| } |
| persp = SkMatrix::Concat(persp, SkMatrix::Translate(-x, -y)); |
| persp = SkMatrix::Concat(SkMatrix::Translate(x, y), persp); |
| canvas->concat(persp); |
| if (TranslateWithMatrix::kYes == translateWithMatrix) { |
| canvas->translate(x, y); |
| x = 0; |
| y = 0; |
| } |
| SkPaint paint; |
| paint.setColor(color); |
| canvas->drawTextBlob(blob, x, y, paint); |
| canvas->restore(); |
| } |
| |
| SkTArray<sk_sp<SkTextBlob>> fBlobs; |
| using INHERITED = skiagm::GM; |
| }; |
| |
| DEF_GM(return new DFTextBlobPerspGM;) |