Hook in rough distance field support for fonts

src/core/SkDraw.cpp

Index: src/core/SkDraw.cpp
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index d2d618090e39d4e085bbf5cf8174721bbe990b93..3e8f95fec699a0e878251b10940502c36f212df9 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -1680,11 +1680,24 @@ void SkDraw::drawText(const char text[], size_t byteLength,
 
     SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
 
-    SkAutoGlyphCache    autoCache(paint, &fDevice->fLeakyProperties, fMatrix);
+    const SkMatrix* ctm = fMatrix;
+    const SkPaint* paintRef = &paint;
+    SkPaint paintCopy;
+    uint32_t procFlags = fProcs ? fProcs->fFlags : 0;
+    if (procFlags & SkDrawProcs::kUseScaledGlyphs_Flag) {
+        paintCopy = paint;
+        paintCopy.setTextSize(32);

[bungeman-skia, 2013/10/24 19:50:48]

32 is quite a magic number. If you want a 'canonical' size, using the typeface's
em size would be good. Note that you'll also want to turn off hinting if you're
looking for 'scalable' outlines.

+        paintCopy.setLCDRenderText(false);
+        paintRef = &paintCopy;
+    }
+    if (procFlags & SkDrawProcs::kSkipBakedGlyphTransform_Flag) {
+        ctm = NULL;
+    }
+    SkAutoGlyphCache    autoCache(*paintRef, &fDevice->fLeakyProperties, ctm);
     SkGlyphCache*       cache = autoCache.getCache();
 
     // transform our starting point
-    {
+    if (!(procFlags & SkDrawProcs::kSkipBakedGlyphTransform_Flag)) {
         SkPoint loc;
         fMatrix->mapXY(x, y, &loc);
         x = loc.fX;
@@ -1742,16 +1755,31 @@ void SkDraw::drawText(const char text[], size_t byteLength,
     SkFixed fx = SkScalarToFixed(x) + d1g.fHalfSampleX;
     SkFixed fy = SkScalarToFixed(y) + d1g.fHalfSampleY;
 
+    SkFixed fscale;
+    if (procFlags & SkDrawProcs::kUseScaledGlyphs_Flag) {
+        SkScalar sscale = paint.getTextSize()/32.f;
+        fscale = SkScalarToFixed(sscale);
+    }
     while (text < stop) {
         const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);
 
-        fx += autokern.adjust(glyph);
+        if (procFlags & SkDrawProcs::kUseScaledGlyphs_Flag) {
+            fx += SkFixedMul_portable(autokern.adjust(glyph), fscale);
+        } else {
+            fx += autokern.adjust(glyph);
+        }
 
         if (glyph.fWidth) {
             proc(d1g, fx, fy, glyph);
         }
-        fx += glyph.fAdvanceX;
-        fy += glyph.fAdvanceY;
+
+        if (procFlags & SkDrawProcs::kUseScaledGlyphs_Flag) {
+            fx += SkFixedMul_portable(glyph.fAdvanceX, fscale);
+            fy += SkFixedMul_portable(glyph.fAdvanceY, fscale);
+        } else {
+            fx += glyph.fAdvanceX;
+            fy += glyph.fAdvanceY;
+        }
     }
 }
 
@@ -1909,7 +1937,19 @@ void SkDraw::drawPosText(const char text[], size_t byteLength,
     }
 
     SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
-    SkAutoGlyphCache    autoCache(paint, &fDevice->fLeakyProperties, fMatrix);
+    const SkMatrix* ctm = fMatrix;
+    const SkPaint* paintRef = &paint;
+    SkPaint paintCopy;
+    uint32_t procFlags = fProcs ? fProcs->fFlags : 0;
+    if (procFlags & SkDrawProcs::kUseScaledGlyphs_Flag) {
+        paintCopy = paint;
+        paintCopy.setTextSize(32);
+        paintRef = &paintCopy;
+    }
+    if (procFlags & SkDrawProcs::kSkipBakedGlyphTransform_Flag) {
+        ctm = NULL;
+    }
+    SkAutoGlyphCache    autoCache(*paintRef, &fDevice->fLeakyProperties, ctm);
     SkGlyphCache*       cache = autoCache.getCache();
 
     SkAAClipBlitterWrapper wrapper;
@@ -1951,7 +1991,12 @@ void SkDraw::drawPosText(const char text[], size_t byteLength,
 
         if (SkPaint::kLeft_Align == paint.getTextAlign()) {
             while (text < stop) {
-                tmsProc(tms, pos);
+                if (procFlags & SkDrawProcs::kSkipBakedGlyphTransform_Flag) {
+                    tms.fLoc.fX = *pos;
+                    tms.fLoc.fY = *(pos+1);
+                } else {
+                    tmsProc(tms, pos);
+                }
 
                 SkFixed fx = SkScalarToFixed(tms.fLoc.fX) + d1g.fHalfSampleX;
                 SkFixed fy = SkScalarToFixed(tms.fLoc.fY) + d1g.fHalfSampleY;