use fix point
This commit is contained in:
Laurent Le Goff
parent
eaa2454bb3
commit
b0b792a0e8
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@ -2,7 +2,7 @@ package main
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import "draw2d.googlecode.com/hg/draw2d/curve"
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import "testing"
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import __os__ "os"
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import __os__ "os"
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import __regexp__ "regexp"
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var tests = []testing.InternalTest{
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@ -13,8 +13,8 @@ var tests = []testing.InternalTest{
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{"curve.TestCubicCurveParabolic", curve.TestCubicCurveParabolic},
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{"curve.TestQuadCurve", curve.TestQuadCurve},
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}
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var benchmarks = []testing.InternalBenchmark{ //
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{"curve.BenchmarkCubicCurveRec", curve.BenchmarkCubicCurveRec},
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var benchmarks = []testing.InternalBenchmark{ {"curve.BenchmarkCubicCurveRec", curve.BenchmarkCubicCurveRec},
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{"curve.BenchmarkCubicCurve", curve.BenchmarkCubicCurve},
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{"curve.BenchmarkCubicCurveAdaptiveRec", curve.BenchmarkCubicCurveAdaptiveRec},
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{"curve.BenchmarkCubicCurveAdaptive", curve.BenchmarkCubicCurveAdaptive},
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@ -6,6 +6,7 @@ GOFILES=\
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polygon.go\
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coverage_table.go\
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fillerAA.go\
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fixed_point.go
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include $(GOROOT)/src/Make.pkg
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@ -3,10 +3,25 @@
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package raster
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var SUBPIXEL_OFFSETS_SAMPLE_8 = [8]float64{
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5 / 8, 0 / 8,
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3 / 8, 6 / 8,
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1 / 8, 4 / 8,
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7 / 8, 2 / 8,
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5 / 8,
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0 / 8,
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3 / 8,
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6 / 8,
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1 / 8,
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4 / 8,
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7 / 8,
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2 / 8,
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}
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var SUBPIXEL_OFFSETS_SAMPLE_8_FIXED = [8]Fix{
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[0]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[1]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[2]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[3]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[4]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[5]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[6]*FIXED_FLOAT_COEF),
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Fix(SUBPIXEL_OFFSETS_SAMPLE_8[7]*FIXED_FLOAT_COEF),
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}
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var SUBPIXEL_OFFSETS_SAMPLE_16 = [16]float64{
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@ -8,13 +8,13 @@ import (
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)
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const (
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SUBPIXEL_SHIFT = 4
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SUBPIXEL_SHIFT = 3
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SUBPIXEL_COUNT = 1 << SUBPIXEL_SHIFT
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)
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var SUBPIXEL_OFFSETS = SUBPIXEL_OFFSETS_SAMPLE_16
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var SUBPIXEL_OFFSETS = SUBPIXEL_OFFSETS_SAMPLE_8_FIXED
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type SUBPIXEL_DATA uint16
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type SUBPIXEL_DATA uint8
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type NON_ZERO_MASK_DATA_UNIT uint8
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type Rasterizer8BitsSample struct {
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@ -119,17 +119,52 @@ func (r *Rasterizer8BitsSample) RenderEvenOdd(img *image.RGBA, color *image.RGBA
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//! Adds an edge to be used with even-odd fill.
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func (r *Rasterizer8BitsSample) addEvenOddEdge(edge *PolygonEdge) {
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x := edge.X
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slope := edge.Slope
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var ySub, mask SUBPIXEL_DATA
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x := Fix(edge.X * FIXED_FLOAT_COEF)
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slope := Fix(edge.Slope * FIXED_FLOAT_COEF)
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slopeFix := Fix(0)
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if (edge.LastLine - edge.FirstLine >= SLOPE_FIX_STEP) {
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slopeFix = Fix(edge.Slope * SLOPE_FIX_STEP * FIXED_FLOAT_COEF) - (slope << SLOPE_FIX_SHIFT);
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}
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var mask SUBPIXEL_DATA
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var ySub uint32
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var xp, yLine int
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for y := edge.FirstLine; y <= edge.LastLine; y++ {
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ySub = SUBPIXEL_DATA(y & (SUBPIXEL_COUNT - 1))
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xp = (int)(x + SUBPIXEL_OFFSETS[ySub])
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ySub = uint32(y & (SUBPIXEL_COUNT - 1))
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xp = int((x + SUBPIXEL_OFFSETS[ySub]) >> FIXED_SHIFT)
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mask = SUBPIXEL_DATA(1 << ySub)
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yLine = y >> SUBPIXEL_SHIFT
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r.MaskBuffer[yLine*r.BufferWidth+xp] ^= mask
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x += slope
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if (y & SLOPE_FIX_MASK) == 0 {
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x += slopeFix;
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}
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}
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}
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//! Adds an edge to be used with non-zero winding fill.
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func (r *Rasterizer8BitsSample) addNonZeroEdge(edge *PolygonEdge) {
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x := Fix(edge.X * FIXED_FLOAT_COEF)
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slope := Fix(edge.Slope * FIXED_FLOAT_COEF)
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slopeFix := Fix(0)
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if (edge.LastLine - edge.FirstLine >= SLOPE_FIX_STEP) {
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slopeFix = Fix(edge.Slope * SLOPE_FIX_STEP * FIXED_FLOAT_COEF) - (slope << SLOPE_FIX_SHIFT);
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}
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var mask SUBPIXEL_DATA
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var ySub uint32
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var xp, yLine int
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winding := NON_ZERO_MASK_DATA_UNIT(edge.Winding)
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for y := edge.FirstLine; y <= edge.LastLine; y++ {
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ySub = uint32(y & (SUBPIXEL_COUNT - 1))
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xp = int((x + SUBPIXEL_OFFSETS[ySub]) >> FIXED_SHIFT)
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mask = SUBPIXEL_DATA(1 << ySub)
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yLine = y >> SUBPIXEL_SHIFT
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r.MaskBuffer[yLine*r.BufferWidth+xp] |= mask
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r.WindingBuffer[(yLine*r.BufferWidth+xp)*SUBPIXEL_COUNT+int(ySub)] += winding
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x += slope
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if (y & SLOPE_FIX_MASK) == 0 {
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x += slopeFix;
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}
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}
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}
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@ -159,9 +194,9 @@ func (r *Rasterizer8BitsSample) fillEvenOdd(img *image.RGBA, color *image.RGBACo
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p := (*uint32)(unsafe.Pointer(&tp[x]))
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mask ^= r.MaskBuffer[y*uint32(r.BufferWidth)+x]
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// 8bits
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//alpha := uint32(coverageTable[mask])
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alpha := uint32(coverageTable[mask])
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// 16bits
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alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
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//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
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// 32bits
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//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
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@ -218,23 +253,6 @@ func (r *Rasterizer8BitsSample) RenderNonZeroWinding(img *image.RGBA, color *ima
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r.fillNonZero(img, color, clipRect)
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}
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//! Adds an edge to be used with non-zero winding fill.
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func (r *Rasterizer8BitsSample) addNonZeroEdge(edge *PolygonEdge) {
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x := edge.X
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slope := edge.Slope
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var ySub, mask SUBPIXEL_DATA
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var xp, yLine int
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winding := NON_ZERO_MASK_DATA_UNIT(edge.Winding)
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for y := edge.FirstLine; y <= edge.LastLine; y++ {
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ySub = SUBPIXEL_DATA(y & (SUBPIXEL_COUNT - 1))
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xp = (int)(x + SUBPIXEL_OFFSETS[ySub])
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mask = SUBPIXEL_DATA(1 << ySub)
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yLine = y >> SUBPIXEL_SHIFT
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r.MaskBuffer[yLine*r.BufferWidth+xp] |= mask
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r.WindingBuffer[(yLine*r.BufferWidth+xp)*SUBPIXEL_COUNT+int(ySub)] += winding
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x += slope
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}
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}
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//! Renders the mask to the canvas with non-zero winding fill.
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func (r *Rasterizer8BitsSample) fillNonZero(img *image.RGBA, color *image.RGBAColor, clipBound [4]float64) {
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@ -281,9 +299,9 @@ func (r *Rasterizer8BitsSample) fillNonZero(img *image.RGBA, color *image.RGBACo
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}
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// 8bits
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//alpha := uint32(coverageTable[mask])
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alpha := uint32(coverageTable[mask])
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// 16bits
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alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
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//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
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// 32bits
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//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
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@ -0,0 +1,302 @@
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// Copyright 2011 The draw2d Authors. All rights reserved.
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// created: 27/05/2011 by Laurent Le Goff
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package raster
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import (
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"image"
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"unsafe"
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)
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const (
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SUBPIXEL_SHIFT = 3
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SUBPIXEL_COUNT = 1 << SUBPIXEL_SHIFT
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)
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var SUBPIXEL_OFFSETS = SUBPIXEL_OFFSETS_SAMPLE_8
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type SUBPIXEL_DATA uint16
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type NON_ZERO_MASK_DATA_UNIT uint8
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type Rasterizer8BitsSample struct {
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MaskBuffer []SUBPIXEL_DATA
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WindingBuffer []NON_ZERO_MASK_DATA_UNIT
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Width int
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BufferWidth int
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Height int
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ClipBound [4]float64
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RemappingMatrix [6]float64
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}
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/* width and height define the maximum output size for the filler.
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* The filler will output to larger bitmaps as well, but the output will
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* be cropped.
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*/
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func NewRasterizer8BitsSample(width, height int) *Rasterizer8BitsSample {
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var r Rasterizer8BitsSample
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// Scale the coordinates by SUBPIXEL_COUNT in vertical direction
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// The sampling point for the sub-pixel is at the top right corner. This
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// adjustment moves it to the pixel center.
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r.RemappingMatrix = [6]float64{1, 0, 0, SUBPIXEL_COUNT, 0.5 / SUBPIXEL_COUNT, -0.5 * SUBPIXEL_COUNT}
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r.Width = width
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r.Height = height
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// The buffer used for filling needs to be one pixel wider than the bitmap.
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// This is because the end flag that turns the fill of is the first pixel
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// after the actually drawn edge.
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r.BufferWidth = width + 1
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r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*height)
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r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*height*SUBPIXEL_COUNT)
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r.ClipBound = clip(0, 0, width, height, SUBPIXEL_COUNT)
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return &r
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}
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func clip(x, y, width, height, scale int) [4]float64 {
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var clipBound [4]float64
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offset := 0.99 / float64(scale)
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clipBound[0] = float64(x) + offset
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clipBound[2] = float64(x+width) - offset
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clipBound[1] = float64(y * scale)
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clipBound[3] = float64((y + height) * scale)
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return clipBound
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}
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func intersect(r1, r2 [4]float64) [4]float64 {
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if r1[0] < r2[0] {
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r1[0] = r2[0]
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}
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if r1[2] > r2[2] {
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r1[2] = r2[2]
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}
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if r1[0] > r1[2] {
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r1[0] = r1[2]
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}
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if r1[1] < r2[1] {
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r1[1] = r2[1]
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}
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if r1[3] > r2[3] {
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r1[3] = r2[3]
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}
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if r1[1] > r1[3] {
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r1[1] = r1[3]
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}
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return r1
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}
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func (r *Rasterizer8BitsSample) RenderEvenOdd(img *image.RGBA, color *image.RGBAColor, polygon *Polygon, tr [6]float64) {
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// memset 0 the mask buffer
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r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
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// inline matrix multiplication
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transform := [6]float64{
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tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
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tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
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tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
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tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
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tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
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tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
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}
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clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
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clipRect = intersect(clipRect, r.ClipBound)
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p := 0
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l := len(*polygon) / 2
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var edges [32]PolygonEdge
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for p < l {
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edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
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for k := 0; k < edgeCount; k++ {
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r.addEvenOddEdge(&(edges[k]))
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}
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p += 16
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}
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r.fillEvenOdd(img, color, clipRect)
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}
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//! Adds an edge to be used with even-odd fill.
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func (r *Rasterizer8BitsSample) addEvenOddEdge(edge *PolygonEdge) {
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x := edge.X
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slope := edge.Slope
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var ySub, mask SUBPIXEL_DATA
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var xp, yLine int
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for y := edge.FirstLine; y <= edge.LastLine; y++ {
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ySub = SUBPIXEL_DATA(y & (SUBPIXEL_COUNT - 1))
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xp = (int)(x + SUBPIXEL_OFFSETS[ySub])
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mask = SUBPIXEL_DATA(1 << ySub)
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yLine = y >> SUBPIXEL_SHIFT
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r.MaskBuffer[yLine*r.BufferWidth+xp] ^= mask
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x += slope
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}
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}
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// Renders the mask to the canvas with even-odd fill.
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func (r *Rasterizer8BitsSample) fillEvenOdd(img *image.RGBA, color *image.RGBAColor, clipBound [4]float64) {
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var x, y uint32
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minX := uint32(clipBound[0])
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maxX := uint32(clipBound[2])
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minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
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maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
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//pixColor := (uint32(color.R) << 24) | (uint32(color.G) << 16) | (uint32(color.B) << 8) | uint32(color.A)
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pixColor := (*uint32)(unsafe.Pointer(color))
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cs1 := *pixColor & 0xff00ff
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cs2 := (*pixColor >> 8) & 0xff00ff
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stride := uint32(img.Stride)
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var mask SUBPIXEL_DATA
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for y = minY; y < maxY; y++ {
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tp := img.Pix[y*stride:]
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mask = 0
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for x = minX; x <= maxX; x++ {
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p := (*uint32)(unsafe.Pointer(&tp[x]))
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mask ^= r.MaskBuffer[y*uint32(r.BufferWidth)+x]
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// 8bits
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alpha := uint32(coverageTable[mask])
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// 16bits
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//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
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// 32bits
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//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
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// alpha is in range of 0 to SUBPIXEL_COUNT
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invAlpha := uint32(SUBPIXEL_COUNT) - alpha
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ct1 := (*p & 0xff00ff) * invAlpha
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ct2 := ((*p >> 8) & 0xff00ff) * invAlpha
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ct1 = ((ct1 + cs1*alpha) >> SUBPIXEL_SHIFT) & 0xff00ff
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ct2 = ((ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT)) & 0xff00ff00
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*p = ct1 + ct2
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}
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}
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}
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/*
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* Renders the polygon with non-zero winding fill.
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* param aTarget the target bitmap.
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* param aPolygon the polygon to render.
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* param aColor the color to be used for rendering.
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* param aTransformation the transformation matrix.
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*/
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func (r *Rasterizer8BitsSample) RenderNonZeroWinding(img *image.RGBA, color *image.RGBAColor, polygon *Polygon, tr [6]float64) {
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r.MaskBuffer = make([]SUBPIXEL_DATA, r.BufferWidth*r.Height)
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r.WindingBuffer = make([]NON_ZERO_MASK_DATA_UNIT, r.BufferWidth*r.Height*SUBPIXEL_COUNT)
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// inline matrix multiplication
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transform := [6]float64{
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tr[0]*r.RemappingMatrix[0] + tr[1]*r.RemappingMatrix[2],
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tr[1]*r.RemappingMatrix[3] + tr[0]*r.RemappingMatrix[1],
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tr[2]*r.RemappingMatrix[0] + tr[3]*r.RemappingMatrix[2],
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tr[3]*r.RemappingMatrix[3] + tr[2]*r.RemappingMatrix[1],
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tr[4]*r.RemappingMatrix[0] + tr[5]*r.RemappingMatrix[2] + r.RemappingMatrix[4],
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tr[5]*r.RemappingMatrix[3] + tr[4]*r.RemappingMatrix[1] + r.RemappingMatrix[5],
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}
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clipRect := clip(img.Bounds().Min.X, img.Bounds().Min.Y, img.Bounds().Dx(), img.Bounds().Dy(), SUBPIXEL_COUNT)
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clipRect = intersect(clipRect, r.ClipBound)
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p := 0
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l := len(*polygon) / 2
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var edges [32]PolygonEdge
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for p < l {
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edgeCount := polygon.getEdges(p, 16, edges[:], transform, clipRect)
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for k := 0; k < edgeCount; k++ {
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r.addNonZeroEdge(&(edges[k]))
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}
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p += 16
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}
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|
||||
r.fillNonZero(img, color, clipRect)
|
||||
}
|
||||
|
||||
//! Adds an edge to be used with non-zero winding fill.
|
||||
func (r *Rasterizer8BitsSample) addNonZeroEdge(edge *PolygonEdge) {
|
||||
x := edge.X
|
||||
slope := edge.Slope
|
||||
var ySub, mask SUBPIXEL_DATA
|
||||
var xp, yLine int
|
||||
winding := NON_ZERO_MASK_DATA_UNIT(edge.Winding)
|
||||
for y := edge.FirstLine; y <= edge.LastLine; y++ {
|
||||
ySub = SUBPIXEL_DATA(y & (SUBPIXEL_COUNT - 1))
|
||||
xp = (int)(x + SUBPIXEL_OFFSETS[ySub])
|
||||
mask = SUBPIXEL_DATA(1 << ySub)
|
||||
yLine = y >> SUBPIXEL_SHIFT
|
||||
r.MaskBuffer[yLine*r.BufferWidth+xp] |= mask
|
||||
r.WindingBuffer[(yLine*r.BufferWidth+xp)*SUBPIXEL_COUNT+int(ySub)] += winding
|
||||
x += slope
|
||||
}
|
||||
}
|
||||
|
||||
//! Renders the mask to the canvas with non-zero winding fill.
|
||||
func (r *Rasterizer8BitsSample) fillNonZero(img *image.RGBA, color *image.RGBAColor, clipBound [4]float64) {
|
||||
var x, y uint32
|
||||
|
||||
minX := uint32(clipBound[0])
|
||||
maxX := uint32(clipBound[2])
|
||||
|
||||
minY := uint32(clipBound[1]) >> SUBPIXEL_SHIFT
|
||||
maxY := uint32(clipBound[3]) >> SUBPIXEL_SHIFT
|
||||
|
||||
//pixColor := (uint32(color.R) << 24) | (uint32(color.G) << 16) | (uint32(color.B) << 8) | uint32(color.A)
|
||||
pixColor := (*uint32)(unsafe.Pointer(color))
|
||||
cs1 := *pixColor & 0xff00ff
|
||||
cs2 := (*pixColor >> 8) & 0xff00ff
|
||||
|
||||
stride := uint32(img.Stride)
|
||||
var mask SUBPIXEL_DATA
|
||||
var n uint32
|
||||
var values [SUBPIXEL_COUNT]NON_ZERO_MASK_DATA_UNIT
|
||||
for n = 0; n < SUBPIXEL_COUNT; n++ {
|
||||
values[n] = 0
|
||||
}
|
||||
|
||||
for y = minY; y < maxY; y++ {
|
||||
tp := img.Pix[y*stride:]
|
||||
|
||||
mask = 0
|
||||
for x = minX; x <= maxX; x++ {
|
||||
p := (*uint32)(unsafe.Pointer(&tp[x]))
|
||||
temp := r.MaskBuffer[y*uint32(r.BufferWidth)+x]
|
||||
if temp != 0 {
|
||||
var bit SUBPIXEL_DATA = 1
|
||||
for n = 0; n < SUBPIXEL_COUNT; n++ {
|
||||
if (temp & bit) != 0 {
|
||||
t := values[n]
|
||||
values[n] += r.WindingBuffer[(y*uint32(r.BufferWidth)+x)*SUBPIXEL_COUNT+n]
|
||||
if (t == 0 || values[n] == 0 )&& t != values[n] {
|
||||
mask ^= bit
|
||||
}
|
||||
}
|
||||
bit <<= 1
|
||||
}
|
||||
}
|
||||
|
||||
// 8bits
|
||||
alpha := uint32(coverageTable[mask])
|
||||
// 16bits
|
||||
//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff])
|
||||
// 32bits
|
||||
//alpha := uint32(coverageTable[mask & 0xff] + coverageTable[(mask >> 8) & 0xff] + coverageTable[(mask >> 16) & 0xff] + coverageTable[(mask >> 24) & 0xff])
|
||||
|
||||
// alpha is in range of 0 to SUBPIXEL_COUNT
|
||||
invAlpha := uint32(SUBPIXEL_COUNT) - alpha
|
||||
|
||||
ct1 := (*p & 0xff00ff) * invAlpha
|
||||
ct2 := ((*p >> 8) & 0xff00ff) * invAlpha
|
||||
|
||||
ct1 = ((ct1 + cs1*alpha) >> SUBPIXEL_SHIFT) & 0xff00ff
|
||||
ct2 = ((ct2 + cs2*alpha) << (8 - SUBPIXEL_SHIFT)) & 0xff00ff00
|
||||
|
||||
*p = ct1 + ct2
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
package raster
|
||||
|
||||
type Fix int32
|
||||
|
||||
const (
|
||||
FIXED_SHIFT = 16
|
||||
FIXED_FLOAT_COEF = 1 << FIXED_SHIFT
|
||||
)
|
||||
|
||||
/*! Fixed point math inevitably introduces rounding error to the DDA. The error is
|
||||
* fixed every now and then by a separate fix value. The defines below set these.
|
||||
*/
|
||||
const (
|
||||
SLOPE_FIX_SHIFT = 8
|
||||
SLOPE_FIX_STEP = 1 << SLOPE_FIX_SHIFT
|
||||
SLOPE_FIX_MASK = SLOPE_FIX_STEP - 1
|
||||
)
|
||||
Loading…
Reference in New Issue