Add support for blending of LCD for all blend modes.
BUG=skia:
Review URL: https://codereview.chromium.org/1313623002
diff --git a/gm/lcdblendmodes.cpp b/gm/lcdblendmodes.cpp
new file mode 100644
index 0000000..a2494cc
--- /dev/null
+++ b/gm/lcdblendmodes.cpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+/*
+ * Tests text rendering with LCD and the various blend modes.
+ */
+
+#include "gm.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+
+namespace skiagm {
+
+static const int kColWidth = 180;
+static const int kNumCols = 4;
+static const int kWidth = kColWidth * kNumCols;
+static const int kHeight = 750;
+
+static SkShader* make_shader(const SkRect& bounds) {
+ const SkPoint pts[] = {
+ { bounds.left(), bounds.top() },
+ { bounds.right(), bounds.bottom() },
+ };
+ const SkColor colors[] = {
+ SK_ColorRED, SK_ColorGREEN,
+ };
+ return SkGradientShader::CreateLinear(pts,
+ colors, nullptr, SK_ARRAY_COUNT(colors),
+ SkShader::kRepeat_TileMode);
+}
+
+class LcdBlendGM : public skiagm::GM {
+public:
+ LcdBlendGM() {
+ const int kPointSize = 25;
+ fTextHeight = SkIntToScalar(kPointSize);
+ }
+
+protected:
+ SkString onShortName() override {
+ SkString name("lcdblendmodes");
+ name.append(sk_tool_utils::major_platform_os_name());
+ return name;
+ }
+
+ SkISize onISize() override { return SkISize::Make(kWidth, kHeight); }
+
+ void onDraw(SkCanvas* canvas) override {
+ this->drawColumn(canvas, SK_ColorBLACK, SK_ColorWHITE, false);
+ canvas->translate(SkIntToScalar(kColWidth), 0);
+ this->drawColumn(canvas, SK_ColorWHITE, SK_ColorBLACK, false);
+ canvas->translate(SkIntToScalar(kColWidth), 0);
+ this->drawColumn(canvas, SK_ColorGREEN, SK_ColorMAGENTA, false);
+ canvas->translate(SkIntToScalar(kColWidth), 0);
+ this->drawColumn(canvas, SK_ColorCYAN, SK_ColorMAGENTA, true);
+ }
+
+ void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) {
+ const struct {
+ SkXfermode::Mode fMode;
+ const char* fLabel;
+ } gModes[] = {
+ { SkXfermode::kClear_Mode, "Clear" },
+ { SkXfermode::kSrc_Mode, "Src" },
+ { SkXfermode::kDst_Mode, "Dst" },
+ { SkXfermode::kSrcOver_Mode, "SrcOver" },
+ { SkXfermode::kDstOver_Mode, "DstOver" },
+ { SkXfermode::kSrcIn_Mode, "SrcIn" },
+ { SkXfermode::kDstIn_Mode, "DstIn" },
+ { SkXfermode::kSrcOut_Mode, "SrcOut" },
+ { SkXfermode::kDstOut_Mode, "DstOut" },
+ { SkXfermode::kSrcATop_Mode, "SrcATop" },
+ { SkXfermode::kDstATop_Mode, "DstATop" },
+ { SkXfermode::kXor_Mode, "Xor" },
+ { SkXfermode::kPlus_Mode, "Plus" },
+ { SkXfermode::kModulate_Mode, "Modulate" },
+ { SkXfermode::kScreen_Mode, "Screen" },
+ { SkXfermode::kOverlay_Mode, "Overlay" },
+ { SkXfermode::kDarken_Mode, "Darken" },
+ { SkXfermode::kLighten_Mode, "Lighten" },
+ { SkXfermode::kColorDodge_Mode, "ColorDodge" },
+ { SkXfermode::kColorBurn_Mode, "ColorBurn" },
+ { SkXfermode::kHardLight_Mode, "HardLight" },
+ { SkXfermode::kSoftLight_Mode, "SoftLight" },
+ { SkXfermode::kDifference_Mode, "Difference" },
+ { SkXfermode::kExclusion_Mode, "Exclusion" },
+ { SkXfermode::kMultiply_Mode, "Multiply" },
+ { SkXfermode::kHue_Mode, "Hue" },
+ { SkXfermode::kSaturation_Mode, "Saturation" },
+ { SkXfermode::kColor_Mode, "Color" },
+ { SkXfermode::kLuminosity_Mode, "Luminosity" },
+ };
+ // Draw background rect
+ SkPaint backgroundPaint;
+ backgroundPaint.setColor(backgroundColor);
+ canvas->drawRectCoords(0, 0, SkIntToScalar(kColWidth), SkIntToScalar(kHeight),
+ backgroundPaint);
+ SkScalar y = fTextHeight;
+ for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) {
+ SkAutoTUnref<SkXfermode> xfermode(SkXfermode::Create(gModes[m].fMode));
+ SkPaint paint;
+ paint.setColor(textColor);
+ paint.setAntiAlias(true);
+ paint.setSubpixelText(true);
+ paint.setLCDRenderText(true);
+ paint.setTextSize(fTextHeight);
+ paint.setXfermode(xfermode);
+ sk_tool_utils::set_portable_typeface(&paint);
+ if (useGrad) {
+ SkRect r;
+ r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight);
+ paint.setShader(make_shader(r))->unref();
+ }
+ SkString string(gModes[m].fLabel);
+ canvas->drawText(gModes[m].fLabel, string.size(), 0, y, paint);
+ y+=fTextHeight;
+ }
+ }
+
+private:
+ SkScalar fTextHeight;
+ typedef skiagm::GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return new LcdBlendGM; )
+}