7c413c859c
This will lessen the diff in a follow-up change. Change-Id: I67257b935e4b5fc6fcc462c83910a3f09f26702f Reviewed-on: https://go-review.googlesource.com/6554 Reviewed-by: David Symonds <dsymonds@golang.org>
560 lines
14 KiB
Go
560 lines
14 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"go/format"
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"io/ioutil"
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"log"
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"os"
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"strings"
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)
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var debug = flag.Bool("debug", false, "")
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func main() {
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flag.Parse()
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w := new(bytes.Buffer)
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w.WriteString("// generated by \"go run gen.go\". DO NOT EDIT.\n\n" +
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"package draw\n\nimport (\n\"image\"\n\"image/color\"\n)\n")
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gen(w, "nnScaler", codeNNLeaf)
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gen(w, "ablScaler", codeABLLeaf)
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genKernel(w)
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if *debug {
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os.Stdout.Write(w.Bytes())
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return
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}
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out, err := format.Source(w.Bytes())
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if err != nil {
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log.Fatal(err)
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}
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if err := ioutil.WriteFile("impl.go", out, 0660); err != nil {
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log.Fatal(err)
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}
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}
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var (
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// dsTypes are the (dst image type, src image type) pairs to generate
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// scale_DType_SType implementations for. The last element in the slice
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// should be the fallback pair ("Image", "image.Image").
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//
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// TODO: add *image.CMYK src type after Go 1.5 is released.
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dsTypes = []struct{ dType, sType string }{
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{"*image.RGBA", "*image.Gray"},
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{"*image.RGBA", "*image.NRGBA"},
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{"*image.RGBA", "*image.RGBA"},
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{"*image.RGBA", "*image.Uniform"},
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{"*image.RGBA", "*image.YCbCr"},
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{"*image.RGBA", "image.Image"},
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{"Image", "image.Image"},
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}
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dTypes, sTypes []string
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sTypesForDType = map[string][]string{}
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)
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func init() {
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dTypesSeen := map[string]bool{}
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sTypesSeen := map[string]bool{}
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for _, t := range dsTypes {
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if !sTypesSeen[t.sType] {
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sTypesSeen[t.sType] = true
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sTypes = append(sTypes, t.sType)
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}
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if !dTypesSeen[t.dType] {
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dTypesSeen[t.dType] = true
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dTypes = append(dTypes, t.dType)
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}
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sTypesForDType[t.dType] = append(sTypesForDType[t.dType], t.sType)
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}
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sTypesForDType["anyDType"] = sTypes
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}
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type data struct {
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dType string
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sType string
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receiver string
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}
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func gen(w *bytes.Buffer, receiver string, code string) {
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expn(w, codeRoot, &data{receiver: receiver})
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for _, t := range dsTypes {
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expn(w, code, &data{
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dType: t.dType,
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sType: t.sType,
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receiver: receiver,
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})
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}
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}
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func genKernel(w *bytes.Buffer) {
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expn(w, codeKernelRoot, &data{})
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for _, sType := range sTypes {
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expn(w, codeKernelLeafX, &data{
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sType: sType,
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})
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}
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for _, dType := range dTypes {
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expn(w, codeKernelLeafY, &data{
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dType: dType,
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})
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}
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}
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func expn(w *bytes.Buffer, code string, d *data) {
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for _, line := range strings.Split(code, "\n") {
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line = expnLine(line, d)
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if line == ";" {
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continue
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}
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fmt.Fprintln(w, line)
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}
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}
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func expnLine(line string, d *data) string {
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for {
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i := strings.IndexByte(line, '$')
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if i < 0 {
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break
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}
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prefix, s := line[:i], line[i+1:]
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i = len(s)
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for j, c := range s {
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if !('A' <= c && c <= 'Z' || 'a' <= c && c <= 'z') {
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i = j
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break
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}
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}
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dollar, suffix := s[:i], s[i:]
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e := expnDollar(prefix, dollar, suffix, d)
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if e == "" {
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log.Fatalf("couldn't expand %q", line)
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}
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line = e
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}
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return line
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}
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func expnDollar(prefix, dollar, suffix string, d *data) string {
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switch dollar {
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case "dType":
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return prefix + d.dType + suffix
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case "dTypeRN":
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return prefix + relName(d.dType) + suffix
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case "sType":
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return prefix + d.sType + suffix
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case "sTypeRN":
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return prefix + relName(d.sType) + suffix
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case "receiver":
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return prefix + d.receiver + suffix
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case "switch":
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return expnSwitch("", true, suffix)
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case "switchD":
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return expnSwitch("", false, suffix)
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case "switchS":
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return expnSwitch("anyDType", false, suffix)
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case "preOuter":
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switch d.dType {
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default:
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return ";"
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case "Image":
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return "" +
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"dstColorRGBA64 := &color.RGBA64{}\n" +
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"dstColor := color.Color(dstColorRGBA64)"
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}
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case "preInner":
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switch d.dType {
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default:
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return ";"
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case "*image.RGBA":
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return "d := dst.PixOffset(dp.X+adr.Min.X, dp.Y+int(dy))"
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}
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case "preKernelInner":
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switch d.dType {
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default:
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return ";"
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case "*image.RGBA":
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return "d := dst.PixOffset(dp.X+int(dx), dp.Y+adr.Min.Y)"
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}
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case "blend":
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args, _ := splitArgs(suffix)
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if len(args) != 4 {
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return ""
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}
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return fmt.Sprintf(""+
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"%sr = %s*%sr + %s*%sr\n"+
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"%sg = %s*%sg + %s*%sg\n"+
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"%sb = %s*%sb + %s*%sb\n"+
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"%sa = %s*%sa + %s*%sa",
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args[3], args[0], args[1], args[2], args[3],
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args[3], args[0], args[1], args[2], args[3],
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args[3], args[0], args[1], args[2], args[3],
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args[3], args[0], args[1], args[2], args[3],
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)
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case "outputu":
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args, _ := splitArgs(suffix)
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if len(args) != 3 {
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return ""
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}
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switch d.dType {
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default:
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log.Fatalf("bad dType %q", d.dType)
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case "Image":
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return fmt.Sprintf(""+
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"dstColorRGBA64.R = uint16(%sr)\n"+
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"dstColorRGBA64.G = uint16(%sg)\n"+
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"dstColorRGBA64.B = uint16(%sb)\n"+
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"dstColorRGBA64.A = uint16(%sa)\n"+
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"dst.Set(dp.X+int(%s), dp.Y+int(%s), dstColor)",
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args[2], args[2], args[2], args[2],
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args[0], args[1],
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)
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case "*image.RGBA":
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return fmt.Sprintf(""+
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"dst.Pix[d+0] = uint8(uint32(%sr) >> 8)\n"+
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"dst.Pix[d+1] = uint8(uint32(%sg) >> 8)\n"+
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"dst.Pix[d+2] = uint8(uint32(%sb) >> 8)\n"+
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"dst.Pix[d+3] = uint8(uint32(%sa) >> 8)\n"+
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"d += 4",
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args[2], args[2], args[2], args[2],
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)
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}
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case "outputf":
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args, _ := splitArgs(suffix)
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if len(args) != 4 {
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return ""
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}
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switch d.dType {
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default:
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log.Fatalf("bad dType %q", d.dType)
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case "Image":
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return fmt.Sprintf(""+
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"dstColorRGBA64.R = ftou(%sr * %s)\n"+
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"dstColorRGBA64.G = ftou(%sg * %s)\n"+
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"dstColorRGBA64.B = ftou(%sb * %s)\n"+
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"dstColorRGBA64.A = ftou(%sa * %s)\n"+
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"dst.Set(dp.X+int(%s), dp.Y+int(%s), dstColor)",
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args[2], args[3], args[2], args[3], args[2], args[3], args[2], args[3],
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args[0], args[1],
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)
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case "*image.RGBA":
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return fmt.Sprintf(""+
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"dst.Pix[d+0] = uint8(ftou(%sr * %s) >> 8)\n"+
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"dst.Pix[d+1] = uint8(ftou(%sg * %s) >> 8)\n"+
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"dst.Pix[d+2] = uint8(ftou(%sb * %s) >> 8)\n"+
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"dst.Pix[d+3] = uint8(ftou(%sa * %s) >> 8)\n"+
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"d += dst.Stride",
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args[2], args[3], args[2], args[3], args[2], args[3], args[2], args[3],
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)
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}
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case "srcf", "srcu":
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lhs, eqOp := splitEq(prefix)
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if lhs == "" {
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return ""
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}
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args, extra := splitArgs(suffix)
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if len(args) != 2 {
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return ""
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}
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tmp := ""
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if dollar == "srcf" {
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tmp = "u"
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}
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buf := new(bytes.Buffer)
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switch d.sType {
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default:
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log.Fatalf("bad sType %q", d.sType)
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case "image.Image", "*image.Gray", "*image.NRGBA", "*image.Uniform", "*image.YCbCr": // TODO: separate code for concrete types.
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fmt.Fprintf(buf, "%sr%s, %sg%s, %sb%s, %sa%s := "+
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"src.At(sp.X + int(%s), sp.Y+int(%s)).RGBA()\n",
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lhs, tmp, lhs, tmp, lhs, tmp, lhs, tmp,
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args[0], args[1],
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)
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case "*image.RGBA":
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// TODO: there's no need to multiply by 0x101 if the next thing
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// we're going to do is shift right by 8.
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fmt.Fprintf(buf, "%si := src.PixOffset(sp.X + int(%s), sp.Y+int(%s))\n"+
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"%sr%s := uint32(src.Pix[%si+0]) * 0x101\n"+
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"%sg%s := uint32(src.Pix[%si+1]) * 0x101\n"+
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"%sb%s := uint32(src.Pix[%si+2]) * 0x101\n"+
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"%sa%s := uint32(src.Pix[%si+3]) * 0x101\n",
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lhs, args[0], args[1],
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lhs, tmp, lhs,
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lhs, tmp, lhs,
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lhs, tmp, lhs,
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lhs, tmp, lhs,
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)
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}
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if dollar == "srcf" {
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fmt.Fprintf(buf, ""+
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"%sr %s float64(%sru)%s\n"+
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"%sg %s float64(%sgu)%s\n"+
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"%sb %s float64(%sbu)%s\n"+
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"%sa %s float64(%sau)%s\n",
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lhs, eqOp, lhs, extra,
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lhs, eqOp, lhs, extra,
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lhs, eqOp, lhs, extra,
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lhs, eqOp, lhs, extra,
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)
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}
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return strings.TrimSpace(buf.String())
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case "tweakDy":
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if d.dType == "*image.RGBA" {
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return strings.Replace(suffix, "for dy, s", "for _, s", 1)
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}
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return suffix
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}
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return ""
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}
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func expnSwitch(dType string, expandBoth bool, template string) string {
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switchVar := "dst"
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if dType != "" {
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switchVar = "src"
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}
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lines := []string{fmt.Sprintf("switch %s := %s.(type) {", switchVar, switchVar)}
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fallback, values := "Image", dTypes
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if dType != "" {
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fallback, values = "image.Image", sTypesForDType[dType]
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}
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for _, v := range values {
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if v == fallback {
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lines = append(lines, "default:")
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} else {
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lines = append(lines, fmt.Sprintf("case %s:", v))
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}
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if dType != "" {
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lines = append(lines, expnLine(template, &data{dType: dType, sType: v}))
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} else if !expandBoth {
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lines = append(lines, expnLine(template, &data{dType: v}))
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} else {
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lines = append(lines, expnSwitch(v, false, template))
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}
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}
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lines = append(lines, "}")
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return strings.Join(lines, "\n")
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}
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func split(s, sep string) (string, string) {
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if i := strings.Index(s, sep); i >= 0 {
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return strings.TrimSpace(s[:i]), strings.TrimSpace(s[i+len(sep):])
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}
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return "", ""
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}
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func splitEq(s string) (lhs, eqOp string) {
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s = strings.TrimSpace(s)
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if lhs, _ = split(s, ":="); lhs != "" {
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return lhs, ":="
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}
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if lhs, _ = split(s, "+="); lhs != "" {
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return lhs, "+="
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}
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return "", ""
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}
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func splitArgs(s string) (args []string, extra string) {
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s = strings.TrimSpace(s)
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if s == "" || s[0] != '[' {
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return nil, ""
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}
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s = s[1:]
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i := strings.IndexByte(s, ']')
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if i < 0 {
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return nil, ""
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}
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args, extra = strings.Split(s[:i], ","), s[i+1:]
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for i := range args {
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args[i] = strings.TrimSpace(args[i])
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}
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return args, extra
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}
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func relName(s string) string {
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if i := strings.LastIndex(s, "."); i >= 0 {
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return s[i+1:]
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}
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return s
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}
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const (
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codeRoot = `
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func (z *$receiver) Scale(dst Image, dp image.Point, src image.Image, sp image.Point) {
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if z.dw <= 0 || z.dh <= 0 || z.sw <= 0 || z.sh <= 0 {
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return
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}
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// adr is the affected destination pixels, relative to dp.
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adr := dst.Bounds().Sub(dp).Intersect(image.Rectangle{Max: image.Point{int(z.dw), int(z.dh)}})
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if adr.Empty() {
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return
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}
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// sr is the source pixels. If it extends beyond the src bounds,
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// we cannot use the type-specific fast paths, as they access
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// the Pix fields directly without bounds checking.
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if sr := (image.Rectangle{sp, sp.Add(image.Point{int(z.sw), int(z.sh)})}); !sr.In(src.Bounds()) {
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z.scale_Image_Image(dst, dp, adr, src, sp)
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} else {
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$switch z.scale_$dTypeRN_$sTypeRN(dst, dp, adr, src, sp)
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}
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}
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`
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codeNNLeaf = `
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func (z *nnScaler) scale_$dTypeRN_$sTypeRN(dst $dType, dp image.Point, adr image.Rectangle, src $sType, sp image.Point) {
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$preOuter
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for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
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sy := (2*uint64(dy) + 1) * uint64(z.sh) / (2 * uint64(z.dh))
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$preInner
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for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
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sx := (2*uint64(dx) + 1) * uint64(z.sw) / (2 * uint64(z.dw))
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p := $srcu[sx, sy]
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$outputu[dx, dy, p]
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}
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}
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}
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`
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codeABLLeaf = `
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func (z *ablScaler) scale_$dTypeRN_$sTypeRN(dst $dType, dp image.Point, adr image.Rectangle, src $sType, sp image.Point) {
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yscale := float64(z.sh) / float64(z.dh)
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xscale := float64(z.sw) / float64(z.dw)
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$preOuter
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for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
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sy := (float64(dy)+0.5)*yscale - 0.5
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sy0 := int32(sy)
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yFrac0 := sy - float64(sy0)
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yFrac1 := 1 - yFrac0
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sy1 := sy0 + 1
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if sy < 0 {
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sy0, sy1 = 0, 0
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yFrac0, yFrac1 = 0, 1
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} else if sy1 >= z.sh {
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sy1 = sy0
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yFrac0, yFrac1 = 1, 0
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}
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$preInner
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for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
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sx := (float64(dx)+0.5)*xscale - 0.5
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sx0 := int32(sx)
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xFrac0 := sx - float64(sx0)
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xFrac1 := 1 - xFrac0
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sx1 := sx0 + 1
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if sx < 0 {
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sx0, sx1 = 0, 0
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xFrac0, xFrac1 = 0, 1
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} else if sx1 >= z.sw {
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sx1 = sx0
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xFrac0, xFrac1 = 1, 0
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}
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s00 := $srcf[sx0, sy0]
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s10 := $srcf[sx1, sy0]
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$blend[xFrac1, s00, xFrac0, s10]
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s01 := $srcf[sx0, sy1]
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s11 := $srcf[sx1, sy1]
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$blend[xFrac1, s01, xFrac0, s11]
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$blend[yFrac1, s10, yFrac0, s11]
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$outputu[dx, dy, s11]
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}
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}
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}
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`
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codeKernelRoot = `
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func (z *kernelScaler) Scale(dst Image, dp image.Point, src image.Image, sp image.Point) {
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if z.dw <= 0 || z.dh <= 0 || z.sw <= 0 || z.sh <= 0 {
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return
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}
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// adr is the affected destination pixels, relative to dp.
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adr := dst.Bounds().Sub(dp).Intersect(image.Rectangle{Max: image.Point{int(z.dw), int(z.dh)}})
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if adr.Empty() {
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return
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}
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// Create a temporary buffer:
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// scaleX distributes the source image's columns over the temporary image.
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// scaleY distributes the temporary image's rows over the destination image.
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// TODO: is it worth having a sync.Pool for this temporary buffer?
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tmp := make([][4]float64, z.dw*z.sh)
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// sr is the source pixels. If it extends beyond the src bounds,
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// we cannot use the type-specific fast paths, as they access
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// the Pix fields directly without bounds checking.
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if sr := (image.Rectangle{sp, sp.Add(image.Point{int(z.sw), int(z.sh)})}); !sr.In(src.Bounds()) {
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z.scaleX_Image(tmp, src, sp)
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} else {
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$switchS z.scaleX_$sTypeRN(tmp, src, sp)
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}
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$switchD z.scaleY_$dTypeRN(dst, dp, adr, tmp)
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}
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`
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codeKernelLeafX = `
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func (z *kernelScaler) scaleX_$sTypeRN(tmp [][4]float64, src $sType, sp image.Point) {
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t := 0
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for y := int32(0); y < z.sh; y++ {
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for _, s := range z.horizontal.sources {
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var pr, pg, pb, pa float64
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for _, c := range z.horizontal.contribs[s.i:s.j] {
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p += $srcf[c.coord, y] * c.weight
|
|
}
|
|
tmp[t] = [4]float64{
|
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pr * s.invTotalWeightFFFF,
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pg * s.invTotalWeightFFFF,
|
|
pb * s.invTotalWeightFFFF,
|
|
pa * s.invTotalWeightFFFF,
|
|
}
|
|
t++
|
|
}
|
|
}
|
|
}
|
|
`
|
|
|
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codeKernelLeafY = `
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func (z *kernelScaler) scaleY_$dTypeRN(dst $dType, dp image.Point, adr image.Rectangle, tmp [][4]float64) {
|
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$preOuter
|
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for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
|
|
$preKernelInner
|
|
$tweakDy for dy, s := range z.vertical.sources[adr.Min.Y:adr.Max.Y] {
|
|
var pr, pg, pb, pa float64
|
|
for _, c := range z.vertical.contribs[s.i:s.j] {
|
|
p := &tmp[c.coord*z.dw+dx]
|
|
pr += p[0] * c.weight
|
|
pg += p[1] * c.weight
|
|
pb += p[2] * c.weight
|
|
pa += p[3] * c.weight
|
|
}
|
|
$outputf[dx, adr.Min.Y+dy, p, s.invTotalWeight]
|
|
}
|
|
}
|
|
}
|
|
`
|
|
)
|