Index: src/gpu/GrTextStrike.cpp |
diff --git a/src/gpu/GrTextStrike.cpp b/src/gpu/GrTextStrike.cpp |
index 0d7fcafe678ebb9cc1fb96f0e32d4c5cea17dc0a..e303a23df8d2b851800d4a2c25b40f84e540894b 100644 |
--- a/src/gpu/GrTextStrike.cpp |
+++ b/src/gpu/GrTextStrike.cpp |
@@ -13,7 +13,7 @@ |
#include "SkString.h" |
#if SK_DISTANCEFIELD_FONTS |
-#include "SkDistanceFieldGen.h" |
+#include "edtaa3.h" |
#endif |
/////////////////////////////////////////////////////////////////////////////// |
@@ -199,9 +199,8 @@ |
#endif |
#if SK_DISTANCEFIELD_FONTS |
-// this acts as the max magnitude for the distance field, |
-// as well as the pad we need around the glyph |
-#define DISTANCE_FIELD_RANGE 4 |
+#define DISTANCE_FIELD_PAD 4 |
+#define DISTANCE_FIELD_RANGE (4.0) |
#endif |
/* |
@@ -254,10 +253,10 @@ |
#if SK_DISTANCEFIELD_FONTS |
// expand bounds to hold full distance field data |
if (fUseDistanceField) { |
- bounds.fLeft -= DISTANCE_FIELD_RANGE; |
- bounds.fRight += DISTANCE_FIELD_RANGE; |
- bounds.fTop -= DISTANCE_FIELD_RANGE; |
- bounds.fBottom += DISTANCE_FIELD_RANGE; |
+ bounds.fLeft -= DISTANCE_FIELD_PAD; |
+ bounds.fRight += DISTANCE_FIELD_PAD; |
+ bounds.fTop -= DISTANCE_FIELD_PAD; |
+ bounds.fBottom += DISTANCE_FIELD_PAD; |
} |
#endif |
glyph->init(packed, bounds); |
@@ -295,13 +294,15 @@ |
GrPlot* plot; |
#if SK_DISTANCEFIELD_FONTS |
if (fUseDistanceField) { |
+ SkASSERT(1 == bytesPerPixel); |
+ |
// we've already expanded the glyph dimensions to match the final size |
// but must shrink back down to get the packed glyph data |
int dfWidth = glyph->width(); |
int dfHeight = glyph->height(); |
- int width = dfWidth - 2*DISTANCE_FIELD_RANGE; |
- int height = dfHeight - 2*DISTANCE_FIELD_RANGE; |
- int stride = width*bytesPerPixel; |
+ int width = dfWidth - 2*DISTANCE_FIELD_PAD; |
+ int height = dfHeight - 2*DISTANCE_FIELD_PAD; |
+ size_t stride = width*bytesPerPixel; |
size_t size = width * height * bytesPerPixel; |
SkAutoSMalloc<1024> storage(size); |
@@ -312,28 +313,71 @@ |
// alloc storage for distance field glyph |
size_t dfSize = dfWidth * dfHeight * bytesPerPixel; |
SkAutoSMalloc<1024> dfStorage(dfSize); |
- |
- if (1 == bytesPerPixel) { |
- (void) SkGenerateDistanceFieldFromImage((unsigned char*)dfStorage.get(), |
- (unsigned char*)storage.get(), |
- width, height, DISTANCE_FIELD_RANGE); |
- } else { |
- // TODO: Fix color emoji |
- // for now, copy glyph into distance field storage |
- // this is not correct, but it won't crash |
- sk_bzero(dfStorage.get(), dfSize); |
- unsigned char* ptr = (unsigned char*) storage.get(); |
- unsigned char* dfPtr = (unsigned char*) dfStorage.get(); |
- size_t dfStride = dfWidth*bytesPerPixel; |
- dfPtr += DISTANCE_FIELD_RANGE*dfStride; |
- dfPtr += DISTANCE_FIELD_RANGE*bytesPerPixel; |
- |
- for (int i = 0; i < height; ++i) { |
- memcpy(dfPtr, ptr, stride); |
- |
- dfPtr += dfStride; |
- ptr += stride; |
+ |
+ // copy glyph into distance field storage |
+ sk_bzero(dfStorage.get(), dfSize); |
+ |
+ unsigned char* ptr = (unsigned char*) storage.get(); |
+ unsigned char* dfPtr = (unsigned char*) dfStorage.get(); |
+ size_t dfStride = dfWidth*bytesPerPixel; |
+ dfPtr += DISTANCE_FIELD_PAD*dfStride; |
+ dfPtr += DISTANCE_FIELD_PAD*bytesPerPixel; |
+ |
+ for (int i = 0; i < height; ++i) { |
+ memcpy(dfPtr, ptr, stride); |
+ |
+ dfPtr += dfStride; |
+ ptr += stride; |
+ } |
+ |
+ // generate distance field data |
+ SkAutoSMalloc<1024> distXStorage(dfWidth*dfHeight*sizeof(short)); |
+ SkAutoSMalloc<1024> distYStorage(dfWidth*dfHeight*sizeof(short)); |
+ SkAutoSMalloc<1024> outerDistStorage(dfWidth*dfHeight*sizeof(double)); |
+ SkAutoSMalloc<1024> innerDistStorage(dfWidth*dfHeight*sizeof(double)); |
+ SkAutoSMalloc<1024> gxStorage(dfWidth*dfHeight*sizeof(double)); |
+ SkAutoSMalloc<1024> gyStorage(dfWidth*dfHeight*sizeof(double)); |
+ |
+ short* distX = (short*) distXStorage.get(); |
+ short* distY = (short*) distYStorage.get(); |
+ double* outerDist = (double*) outerDistStorage.get(); |
+ double* innerDist = (double*) innerDistStorage.get(); |
+ double* gx = (double*) gxStorage.get(); |
+ double* gy = (double*) gyStorage.get(); |
+ |
+ dfPtr = (unsigned char*) dfStorage.get(); |
+ EDTAA::computegradient(dfPtr, dfWidth, dfHeight, gx, gy); |
+ EDTAA::edtaa3(dfPtr, gx, gy, dfWidth, dfHeight, distX, distY, outerDist); |
+ |
+ for (int i = 0; i < dfWidth*dfHeight; ++i) { |
+ *dfPtr = 255 - *dfPtr; |
+ dfPtr++; |
+ } |
+ dfPtr = (unsigned char*) dfStorage.get(); |
+ sk_bzero(gx, sizeof(double)*dfWidth*dfHeight); |
+ sk_bzero(gy, sizeof(double)*dfWidth*dfHeight); |
+ EDTAA::computegradient(dfPtr, dfWidth, dfHeight, gx, gy); |
+ EDTAA::edtaa3(dfPtr, gx, gy, dfWidth, dfHeight, distX, distY, innerDist); |
+ |
+ for (int i = 0; i < dfWidth*dfHeight; ++i) { |
+ unsigned char val; |
+ double outerval = outerDist[i]; |
+ if (outerval < 0.0) { |
+ outerval = 0.0; |
} |
+ double innerval = innerDist[i]; |
+ if (innerval < 0.0) { |
+ innerval = 0.0; |
+ } |
+ double dist = outerval - innerval; |
+ if (dist <= -DISTANCE_FIELD_RANGE) { |
+ val = 255; |
+ } else if (dist > DISTANCE_FIELD_RANGE) { |
+ val = 0; |
+ } else { |
+ val = (unsigned char)((DISTANCE_FIELD_RANGE-dist)*128.0/DISTANCE_FIELD_RANGE); |
+ } |
+ *dfPtr++ = val; |
} |
// copy to atlas |