gm/textblobrandomfont.cpp

/*
 * 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/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/SkFontStyle.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkImageInfo.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/SkTypeface.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include "tools/fonts/RandomScalerContext.h"

#if defined(SK_GANESH)
#include "include/gpu/ganesh/GrDirectContext.h"
#include "include/gpu/ganesh/GrRecordingContext.h"
#endif

#include <string.h>
#include <utility>

namespace skiagm {
class TextBlobRandomFont : public GM {
public:
    // This gm tests that textblobs can be translated and scaled with a font that returns random
    // but deterministic masks
    TextBlobRandomFont() { }

protected:
    void onOnceBeforeDraw() override {
        SkTextBlobBuilder builder;

        const char* text = "The quick brown fox jumps over the lazy dog.";

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setColor(SK_ColorMAGENTA);

        // make textbloben
        SkFont font;
        font.setSize(32);
        font.setEdging(SkFont::Edging::kSubpixelAntiAlias);

        // Setup our random scaler context
        auto typeface = ToolUtils::CreatePortableTypeface("sans-serif", SkFontStyle::Bold());
        SkASSERT(typeface);
        font.setTypeface(sk_make_sp<SkRandomTypeface>(std::move(typeface), paint, false));

        SkScalar y = 0;
        SkRect bounds;
        font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
        y -= bounds.fTop;
        ToolUtils::add_to_text_blob(&builder, text, font, 0, y);
        y += bounds.fBottom;

        // A8
        const char* bigtext1 = "The quick brown fox";
        const char* bigtext2 = "jumps over the lazy dog.";
        font.setSize(160);
        font.setSubpixel(false);
        font.setEdging(SkFont::Edging::kAntiAlias);
        font.measureText(bigtext1, strlen(bigtext1), SkTextEncoding::kUTF8, &bounds);
        y -= bounds.fTop;
        ToolUtils::add_to_text_blob(&builder, bigtext1, font, 0, y);
        y += bounds.fBottom;

        font.measureText(bigtext2, strlen(bigtext2), SkTextEncoding::kUTF8, &bounds);
        y -= bounds.fTop;
        ToolUtils::add_to_text_blob(&builder, bigtext2, font, 0, y);
        y += bounds.fBottom;

        // color emoji
        ToolUtils::EmojiTestSample sample = ToolUtils::EmojiSample();
        if (sample.typeface) {
            font.setTypeface(sk_make_sp<SkRandomTypeface>(sample.typeface, paint, false));
            font.measureText(sample.sampleText, strlen(sample.sampleText), SkTextEncoding::kUTF8, &bounds);
            y -= bounds.fTop;
            ToolUtils::add_to_text_blob(&builder, sample.sampleText, font, 0, y);
            y += bounds.fBottom;
        }

        // build
        fBlob = builder.make();
    }

    SkString getName() const override { return SkString("textblobrandomfont"); }

    SkISize getISize() override { return SkISize::Make(kWidth, kHeight); }

    DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
        bool isGPU = false;

#if defined(SK_GANESH)
        isGPU = isGPU || SkToBool(GrAsDirectContext(canvas->recordingContext()));
#endif

#if defined(SK_GRAPHITE)
        isGPU = isGPU || SkToBool(canvas->recorder());
#endif

        if (!isGPU) {
            *errorMsg = skiagm::GM::kErrorMsg_DrawSkippedGpuOnly;
            return skiagm::DrawResult::kSkip;
        }

        // This GM uses ToolUtils::makeSurface which doesn't work well with vias.
        // This GM uses SkRandomTypeface which doesn't work well with serialization.
        canvas->drawColor(SK_ColorWHITE);

        SkImageInfo info = SkImageInfo::Make(kWidth, kHeight, canvas->imageInfo().colorType(),
                                             kPremul_SkAlphaType,
                                             canvas->imageInfo().refColorSpace());
        SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
        auto           surface(ToolUtils::makeSurface(canvas, info, &props));
        if (!surface) {
            *errorMsg = "This test requires a surface";
            return DrawResult::kFail;
        }

        SkPaint paint;
        paint.setAntiAlias(true);

        SkCanvas* surfaceCanvas = surface->getCanvas();

        SkScalar stride = SkScalarCeilToScalar(fBlob->bounds().height());
        SkScalar yOffset = 5;

        canvas->save();
        // Originally we would alternate between rotating and not to force blob regeneration,
        // but that code seems to have rotted. Keeping the rotate to match the old GM as
        // much as possible, and it seems like a reasonable stress test for transformed
        // color emoji.
        canvas->rotate(-0.05f);
        canvas->drawTextBlob(fBlob, 10, yOffset, paint);
        yOffset += stride;
        canvas->restore();

        // Rotate in the surface canvas, not the final canvas, to avoid aliasing
        surfaceCanvas->rotate(-0.05f);
        surfaceCanvas->drawTextBlob(fBlob, 10, yOffset, paint);
        surface->draw(canvas, 0, 0);
        yOffset += stride;

#if defined(SK_GANESH)
        if (auto dContext = GrAsDirectContext(canvas->recordingContext())) {
            // free gpu resources and verify
            dContext->freeGpuResources();
        }
#endif

        canvas->rotate(-0.05f);
        canvas->drawTextBlob(fBlob, 10, yOffset, paint);
        yOffset += stride;
        return DrawResult::kOk;
    }

private:
    sk_sp<SkTextBlob> fBlob;

    inline static constexpr int kWidth = 2000;
    inline static constexpr int kHeight = 1600;

    using INHERITED = GM;
};

//////////////////////////////////////////////////////////////////////////////

DEF_GM(return new TextBlobRandomFont;)
}  // namespace skiagm