Add font scaler gm.

http://codereview.appspot.com/5337044/


git-svn-id: http://skia.googlecode.com/svn/trunk@2603 2bbb7eff-a529-9590-31e7-b0007b416f81

gm/fontscaler.cpp

@@ -0,0 +1,129 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "gm.h"
+#include "SkTypeface.h"
+
+namespace skiagm {
+
+static const struct {
+    const char* fName;
+    SkTypeface::Style fStyle;
+} gFaces[] = {
+    { NULL, SkTypeface::kNormal },
+    { NULL, SkTypeface::kBold },
+    { "serif", SkTypeface::kNormal },
+    { "serif", SkTypeface::kBold },
+    { "serif", SkTypeface::kItalic },
+    { "serif", SkTypeface::kBoldItalic },
+    { "monospace", SkTypeface::kNormal }
+};
+
+static const int gFaceCount = SK_ARRAY_COUNT(gFaces);
+
+class FontScalerGM : public GM {
+public:
+    FontScalerGM() {
+        this->setBGColor(0xFFFFFFFF);
+
+        for (int i = 0; i < gFaceCount; i++) {
+            fFaces[i] = SkTypeface::CreateFromName(gFaces[i].fName,
+                                                   gFaces[i].fStyle);
+        }
+    }
+
+    virtual ~FontScalerGM() {
+        for (int i = 0; i < gFaceCount; i++) {
+            SkSafeUnref(fFaces[i]);
+        }
+    }
+
+protected:
+    virtual SkString onShortName() {
+        return SkString("fontscaler");
+    }
+
+    virtual SkISize onISize() {
+        return make_isize(1500, 750);
+    }
+
+    static void rotate_about(SkCanvas* canvas, SkScalar degrees, SkScalar px, SkScalar py) {
+        canvas->translate(px, py);
+        canvas->rotate(degrees);
+        canvas->translate(-px, -py);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        SkPaint paint;
+
+        // test handling of obscene cubic values (currently broken)
+        if (false) {
+            SkPoint pts[4];
+            pts[0].set(1.61061274e+09f, 6291456);
+            pts[1].set(-7.18397061e+15f, -1.53091184e+13f);
+            pts[2].set(-1.30077315e+16f, -2.77196141e+13f);
+            pts[3].set(-1.30077315e+16f, -2.77196162e+13f);
+
+            SkPath path;
+            path.moveTo(pts[0]);
+            path.cubicTo(pts[1], pts[2], pts[3]);
+            canvas->drawPath(path, paint);
+        }
+
+        paint.setAntiAlias(true);
+        paint.setLCDRenderText(true);
+        //With freetype the default (normal hinting) can be really ugly.
+        //Most distros now set slight (vertical hinting only) in any event.
+        paint.setHinting(SkPaint::kSlight_Hinting);
+        SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromName("Times Roman", SkTypeface::kNormal)));
+
+//        const char* text = "abcdefghijklmnopqrstuvwxyz";
+        const char* text = "Hamburgefons ooo mmm";
+        const size_t textLen = strlen(text);
+
+        for (int j = 0; j < 2; ++j) {
+            for (int i = 0; i < 6; ++i) {
+                SkScalar x = SkIntToScalar(10);
+                SkScalar y = SkIntToScalar(20);
+
+                SkAutoCanvasRestore acr(canvas, true);
+                canvas->translate(SkIntToScalar(50 + i * 230),
+                                  SkIntToScalar(20));
+                rotate_about(canvas, SkIntToScalar(i * 5), x, y * 10);
+
+                {
+                    SkPaint p;
+                    p.setAntiAlias(true);
+                    SkRect r;
+                    r.set(x-3, 15, x-1, 280);
+                    canvas->drawRect(r, p);
+                }
+
+                int index = 0;
+                for (int ps = 6; ps <= 22; ps++) {
+                    paint.setTextSize(SkIntToScalar(ps));
+                    canvas->drawText(text, textLen, x, y, paint);
+                    y += paint.getFontMetrics(NULL);
+                    index += 1;
+                }
+            }
+            canvas->translate(0, 360);
+            paint.setSubpixelText(true);
+        }
+    }
+
+private:
+    SkTypeface* fFaces[gFaceCount];
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new FontScalerGM; }
+static GMRegistry reg(MyFactory);
+
+}
+

gyp/gmslides.gypi

@@ -10,6 +10,7 @@
     '../gm/emptypath.cpp',
     '../gm/filltypes.cpp',
     '../gm/filltypespersp.cpp',
+    '../gm/fontscaler.cpp',
     '../gm/gradients.cpp',
     '../gm/hairmodes.cpp',
     '../gm/lcdtext.cpp',

src/ports/SkFontHost_FreeType.cpp

@@ -951,6 +951,14 @@ void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) {
       case FT_GLYPH_FORMAT_OUTLINE: {
         FT_BBox bbox;
 
+        if (0 == fFace->glyph->outline.n_contours) {
+            glyph->fWidth = 0;
+            glyph->fHeight = 0;
+            glyph->fTop = 0;
+            glyph->fLeft = 0;
+            break;
+        }
+
         if (fRec.fFlags & kEmbolden_Flag) {
             emboldenOutline(&fFace->glyph->outline);
         }