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Improve quality of distance field rendering

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- Update spacing of LODs to get better results scaling up to 256
- Remove unnecessary "bolding" from dftext
- Add debug colors for dftext LODs

BUG=skia:2933,skia:2935

Review URL: https://codereview.chromium.org/703463002
This commit is contained in:
jvanverth 2014-11-03 14:00:24 -08:00 committed by Commit bot
parent a6ca5a002e
commit ada68ef2dc
4 changed files with 29 additions and 19 deletions
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10
expectations/gm/ignored-tests.txt
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@ -66,3 +66,13 @@ multipicturedraw_sierpinski_tiled
#joshualitt
texture_domain_effect
#jvanverth https://codereview.chromium.org/703463002
dftext
nested_aa
path-reverse
pathfill
polygons
pathopsinverse
rects

4
src/gpu/GrAADistanceFieldPathRenderer.cpp
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@ -37,8 +37,8 @@ static int g_NumFreedPaths = 0;
// mip levels
static const int kSmallMIP = 32;
static const int kMediumMIP = 64;
static const int kLargeMIP = 128;
static const int kMediumMIP = 78;
static const int kLargeMIP = 192;
////////////////////////////////////////////////////////////////////////////////
GrAADistanceFieldPathRenderer::GrAADistanceFieldPathRenderer(GrContext* context)

18
src/gpu/GrDistanceFieldTextContext.cpp
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@ -34,9 +34,9 @@ SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
static const int kSmallDFFontSize = 32;
static const int kSmallDFFontLimit = 32;
static const int kMediumDFFontSize = 64;
static const int kMediumDFFontLimit = 64;
static const int kLargeDFFontSize = 128;
static const int kMediumDFFontSize = 78;
static const int kMediumDFFontLimit = 78;
static const int kLargeDFFontSize = 192;
namespace {
// position + texture coord
@ -153,12 +153,24 @@ inline void GrDistanceFieldTextContext::init(const GrPaint& paint, const SkPaint
if (scaledTextSize <= kSmallDFFontLimit) {
fTextRatio = textSize / kSmallDFFontSize;
fSkPaint.setTextSize(SkIntToScalar(kSmallDFFontSize));
#if DEBUG_TEXT_SIZE
fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0x00, 0xFF));
fPaint.setColor(GrColorPackRGBA(0x00, 0x00, 0xFF, 0xFF));
#endif
} else if (scaledTextSize <= kMediumDFFontLimit) {
fTextRatio = textSize / kMediumDFFontSize;
fSkPaint.setTextSize(SkIntToScalar(kMediumDFFontSize));
#if DEBUG_TEXT_SIZE
fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0xFF, 0x00));
fPaint.setColor(GrColorPackRGBA(0x00, 0xFF, 0x00, 0xFF));
#endif
} else {
fTextRatio = textSize / kLargeDFFontSize;
fSkPaint.setTextSize(SkIntToScalar(kLargeDFFontSize));
#if DEBUG_TEXT_SIZE
fSkPaint.setColor(SkColorSetARGB(0xFF, 0xFF, 0x00, 0x00));
fPaint.setColor(GrColorPackRGBA(0xFF, 0x00, 0x00, 0xFF));
#endif
}
fUseLCDText = fSkPaint.isLCDRenderText();

16
src/gpu/effects/GrDistanceFieldTextureEffect.cpp
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@ -16,16 +16,6 @@
#include "SkDistanceFieldGen.h"
// To get optical sizes people don't complain about when we blit correctly,
// we need to slightly bold each glyph. On the Mac, we need a larger bold value.
#if defined(SK_BUILD_FOR_MAC)
#define SK_DistanceFieldLCDFactor "0.33"
#define SK_DistanceFieldNonLCDFactor "0.25"
#else
#define SK_DistanceFieldLCDFactor "0.05"
#define SK_DistanceFieldNonLCDFactor "0.05"
#endif
// Assuming a radius of the diagonal of the fragment, hence a factor of sqrt(2)/2
#define SK_DistanceFieldAAFactor "0.7071"
@ -66,8 +56,7 @@ public:
kVec2f_GrSLType);
fsBuilder->codeAppend(";\n");
fsBuilder->codeAppend("\tfloat distance = "
SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ")"
"+ " SK_DistanceFieldNonLCDFactor ";\n");
SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");");
// we adjust for the effect of the transformation on the distance by using
// the length of the gradient of the texture coordinates. We use st coordinates
@ -465,8 +454,7 @@ public:
fsBuilder->codeAppend("\tdistance.z = texColor.r;\n");
fsBuilder->codeAppend("\tdistance = "
"vec3(" SK_DistanceFieldMultiplier ")*(distance - vec3(" SK_DistanceFieldThreshold"))"
"+ vec3(" SK_DistanceFieldLCDFactor ");\n");
"vec3(" SK_DistanceFieldMultiplier ")*(distance - vec3(" SK_DistanceFieldThreshold"));");
// we adjust for the effect of the transformation on the distance by using
// the length of the gradient of the texture coordinates. We use st coordinates