Add gm for various font rendering combinations.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2080453002
Review-Url: https://codereview.chromium.org/2080453002
diff --git a/gm/typeface.cpp b/gm/typeface.cpp
index e4e0d24..8b6a648 100644
--- a/gm/typeface.cpp
+++ b/gm/typeface.cpp
@@ -6,8 +6,10 @@
*/
#include "gm.h"
+#include "Resources.h"
#include "SkCanvas.h"
#include "SkString.h"
+#include "SkSurfaceProps.h"
#include "SkTypeface.h"
#include "SkTypes.h"
@@ -152,7 +154,128 @@
typedef skiagm::GM INHERITED;
};
+static void rotate_about(SkCanvas* canvas,
+ SkScalar degrees,
+ SkScalar px, SkScalar py) {
+ canvas->translate(px, py);
+ canvas->rotate(degrees);
+ canvas->translate(-px, -py);
+}
+
+class TypefaceRenderingGM : public skiagm::GM {
+ sk_sp<SkTypeface> fFace;
+
+public:
+ TypefaceRenderingGM() { }
+
+protected:
+ void onOnceBeforeDraw() override {
+ fFace = MakeResourceAsTypeface("/fonts/hintgasp.ttf");
+ }
+
+ SkString onShortName() override {
+ SkString name("typefacerendering");
+ name.append(sk_tool_utils::major_platform_os_name());
+ return name;
+ }
+
+ SkISize onISize() override {
+ return SkISize::Make(640, 480);
+ }
+
+ void onDraw(SkCanvas* canvas) override {
+ struct AliasType {
+ bool antiAlias;
+ bool subpixelAntitalias;
+ bool inLayer;
+ } constexpr aliasTypes[] {
+ { false, false, false }, // aliased
+ { true, false, false }, // anti-aliased
+ { true, true , false }, // subpixel anti-aliased
+ { true, false, true }, // anti-aliased in layer (flat pixel geometry)
+ { true, true , true }, // subpixel anti-aliased in layer (flat pixel geometry)
+ };
+
+ // The hintgasp.ttf is designed for the following sizes to be different.
+ // GASP_DOGRAY 0x0002 0<=ppem<=10
+ // GASP_SYMMETRIC_SMOOTHING 0x0008 0<=ppem<=10
+ // GASP_GRIDFIT 0x0001 11<=ppem<=12
+ // GASP_SYMMETRIC_GRIDFIT 0x0004 11<=ppem<=12
+ // GASP_DOGRAY|GASP_GRIDFIT 0x0003 13<=ppem<=14
+ // GASP_SYMMETRIC_SMOOTHING|GASP_SYMMETRIC_GRIDFIT 0x000C 13<=ppem<=14
+ // (neither) 0x0000 15<=ppem
+ constexpr SkScalar textSizes[] = { 10, 12, 14, 16 };
+
+ constexpr SkPaint::Hinting hintingTypes[] = { SkPaint::kNo_Hinting,
+ SkPaint::kSlight_Hinting,
+ SkPaint::kNormal_Hinting,
+ SkPaint::kFull_Hinting };
+
+ struct SubpixelType {
+ bool requested;
+ SkVector offset;
+ } constexpr subpixelTypes[] = {
+ { false, { 0.00, 0.00 } },
+ { true , { 0.00, 0.00 } },
+ { true , { 0.25, 0.00 } },
+ { true , { 0.25, 0.25 } },
+ };
+
+ constexpr bool rotateABitTypes[] = { false, true };
+
+ SkPaint paint;
+ SkScalar x = 0;
+ SkScalar xMax = x;
+ SkScalar xBase = 0;
+ SkScalar y = 0; // The baseline of the previous output
+ for (const SubpixelType subpixel : subpixelTypes) {
+ y = 0;
+ paint.setSubpixelText(subpixel.requested);
+
+ for (const AliasType& alias : aliasTypes) {
+ paint.setAntiAlias(alias.antiAlias);
+ paint.setLCDRenderText(alias.subpixelAntitalias);
+ SkAutoCanvasRestore acr(canvas, false);
+ if (alias.inLayer) {
+ canvas->saveLayer(nullptr, &paint);
+ }
+
+ for (const SkScalar& textSize : textSizes) {
+ x = xBase + 5;
+ paint.setTextSize(textSize);
+
+ SkScalar dy = SkScalarCeilToScalar(paint.getFontMetrics(nullptr));
+ y += dy;
+ for (const SkPaint::Hinting& hinting : hintingTypes) {
+ paint.setHinting(hinting);
+
+ for (const bool& rotateABit : rotateABitTypes) {
+ SkAutoCanvasRestore acr(canvas, true);
+ if (rotateABit) {
+ rotate_about(canvas, 2, x + subpixel.offset.x(),
+ y + subpixel.offset.y());
+ }
+ canvas->drawText("A", 1, x + subpixel.offset.x(),
+ y + subpixel.offset.y(), paint);
+
+ SkScalar dx = SkScalarCeilToScalar(paint.measureText("A", 1)) + 5;
+ x += dx;
+ xMax = SkTMax(x, xMax);
+ }
+ }
+ }
+ y += 10;
+ }
+ xBase = xMax;
+ }
+ }
+
+private:
+ typedef skiagm::GM INHERITED;
+};
+
///////////////////////////////////////////////////////////////////////////////
DEF_GM( return new TypefaceStylesGM(false); )
DEF_GM( return new TypefaceStylesGM(true); )
+DEF_GM( return new TypefaceRenderingGM(); )
diff --git a/resources/fonts/hintgasp.ttf b/resources/fonts/hintgasp.ttf
new file mode 100644
index 0000000..f533643
--- /dev/null
+++ b/resources/fonts/hintgasp.ttf
Binary files differ