gm/coloremoji_blendmodes.cpp

/*
 * Copyright 2014 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/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontStyle.h"
#include "include/core/SkFontTypes.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/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradient.h"
#include "include/utils/SkTextUtils.h"
#include "src/core/SkUTF.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"

#include <array>
#include <string.h>

namespace {

static uint32_t gData[] = { 0xFFFFFFFF, 0xFFCCCCCC, 0xFFCCCCCC, 0xFFFFFFFF };

class ColorEmojiBlendModesGM : public skiagm::GM {
public:
    const static int W = 64;
    const static int H = 64;
    ColorEmojiBlendModesGM(ToolUtils::EmojiFontFormat format) : fFormat(format) {}

protected:
    void onOnceBeforeDraw() override {
        const SkColor4f colors[] = {
            SkColors::kRed, SkColors::kGreen, SkColors::kBlue,
            SkColors::kMagenta, SkColors::kCyan, SkColors::kYellow
        };
        SkMatrix local;
        local.setRotate(180);
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setShader(SkShaders::SweepGradient({0, 0},
                                                 {{colors, {}, SkTileMode::kClamp}, {}}, &local));

        sk_sp<SkTypeface> orig(ToolUtils::CreatePortableTypeface("serif", SkFontStyle::Bold()));
        SkASSERT(orig);
        fColorSample = ToolUtils::EmojiSample(fFormat);

        fBG.installPixels(SkImageInfo::Make(2, 2, kRGBA_8888_SkColorType, kOpaque_SkAlphaType),
                          gData, 8);
    }

    SkString getName() const override {
        return SkString("coloremoji_blendmodes_") += ToolUtils::NameForFontFormat(fFormat);
    }

    SkISize getISize() override { return {400, 640}; }

    DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {

        if (!fColorSample.typeface) {
            *errorMsg = SkStringPrintf("Unable to instantiate emoji test font of format %s.",
                                       ToolUtils::NameForFontFormat(fFormat).c_str());
            return DrawResult::kSkip;
        }

        canvas->translate(SkIntToScalar(10), SkIntToScalar(20));

        static constexpr auto gModes = std::to_array<SkBlendMode>({
                SkBlendMode::kClear,
                SkBlendMode::kSrc,
                SkBlendMode::kDst,
                SkBlendMode::kSrcOver,
                SkBlendMode::kDstOver,
                SkBlendMode::kSrcIn,
                SkBlendMode::kDstIn,
                SkBlendMode::kSrcOut,
                SkBlendMode::kDstOut,
                SkBlendMode::kSrcATop,
                SkBlendMode::kDstATop,

                SkBlendMode::kXor,
                SkBlendMode::kPlus,
                SkBlendMode::kModulate,
                SkBlendMode::kScreen,
                SkBlendMode::kOverlay,
                SkBlendMode::kDarken,
                SkBlendMode::kLighten,
                SkBlendMode::kColorDodge,
                SkBlendMode::kColorBurn,
                SkBlendMode::kHardLight,
                SkBlendMode::kSoftLight,
                SkBlendMode::kDifference,
                SkBlendMode::kExclusion,
                SkBlendMode::kMultiply,
                SkBlendMode::kHue,
                SkBlendMode::kSaturation,
                SkBlendMode::kColor,
                SkBlendMode::kLuminosity,
        });

        const SkScalar w = SkIntToScalar(W);
        const SkScalar h = SkIntToScalar(H);
        SkMatrix m;
        m.setScale(SkIntToScalar(6), SkIntToScalar(6));
        auto s = fBG.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions(), m);

        SkFont labelFont(ToolUtils::DefaultPortableTypeface());

        SkPaint textP;
        textP.setAntiAlias(true);
        SkFont textFont(fColorSample.typeface, 70);

        const int kWrap = 5;

        SkScalar x0 = 0;
        SkScalar y0 = 0;
        SkScalar x = x0, y = y0;
        for (size_t i = 0; i < std::size(gModes); i++) {
            SkRect r;
            r.setLTRB(x, y, x+w, y+h);

            SkPaint p;
            p.setStyle(SkPaint::kFill_Style);
            p.setShader(s);
            canvas->drawRect(r, p);

            r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
            p.setStyle(SkPaint::kStroke_Style);
            p.setShader(nullptr);
            canvas->drawRect(r, p);

            {
                SkAutoCanvasRestore arc(canvas, true);
                canvas->clipRect(r);
                textP.setBlendMode(gModes[i]);
                const char* text    = fColorSample.sampleText;
                SkUnichar unichar = SkUTF::NextUTF8(&text, text + strlen(text));
                SkASSERT(unichar >= 0);
                canvas->drawSimpleText(&unichar, 4, SkTextEncoding::kUTF32,
                                       x+ w/10.f, y + 7.f*h/8.f, textFont, textP);
            }
#if 1
            const char* label = SkBlendMode_Name(gModes[i]);
            SkTextUtils::DrawString(canvas, label, x + w/2, y - labelFont.getSize()/2,
                                    labelFont, SkPaint(), SkTextUtils::kCenter_Align);
#endif
            x += w + SkIntToScalar(10);
            if ((i % kWrap) == kWrap - 1) {
                x = x0;
                y += h + SkIntToScalar(30);
            }
        }

        return DrawResult::kOk;
    }

private:
    SkBitmap fBG;
    ToolUtils::EmojiFontFormat fFormat;
    ToolUtils::EmojiTestSample fColorSample;

    using INHERITED = GM;
};
}  // namespace

DEF_GM(return new ColorEmojiBlendModesGM(ToolUtils::EmojiFontFormat::ColrV0);)
DEF_GM(return new ColorEmojiBlendModesGM(ToolUtils::EmojiFontFormat::Sbix);)
DEF_GM(return new ColorEmojiBlendModesGM(ToolUtils::EmojiFontFormat::Cbdt);)
DEF_GM(return new ColorEmojiBlendModesGM(ToolUtils::EmojiFontFormat::Test);)
DEF_GM(return new ColorEmojiBlendModesGM(ToolUtils::EmojiFontFormat::Svg);)