ebiten/imageparts.go

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// Copyright 2015 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ebiten
import (
"image"
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"math"
"github.com/hajimehoshi/ebiten/internal/endian"
"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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// An ImagePart is deprecated (as of 1.1.0-alpha): Use ImageParts instead.
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type ImagePart struct {
Dst image.Rectangle
Src image.Rectangle
}
// An ImageParts represents the parts of the destination image and the parts of the source image.
type ImageParts interface {
Len() int
Dst(i int) (x0, y0, x1, y1 int)
Src(i int) (x0, y0, x1, y1 int)
}
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// NOTE: Remove this in the future.
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type imageParts []ImagePart
func (p imageParts) Len() int {
return len(p)
}
func (p imageParts) Dst(i int) (x0, y0, x1, y1 int) {
dst := &p[i].Dst
return dst.Min.X, dst.Min.Y, dst.Max.X, dst.Max.Y
}
func (p imageParts) Src(i int) (x0, y0, x1, y1 int) {
src := &p[i].Src
return src.Min.X, src.Min.Y, src.Max.X, src.Max.Y
}
type wholeImage struct {
width int
height int
}
func (w *wholeImage) Len() int {
return 1
}
func (w *wholeImage) Dst(i int) (x0, y0, x1, y1 int) {
return 0, 0, w.width, w.height
}
func (w *wholeImage) Src(i int) (x0, y0, x1, y1 int) {
return 0, 0, w.width, w.height
}
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func u(x, width2p int) int16 {
return int16(math.MaxInt16 * x / width2p)
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}
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func v(y, height2p int) int16 {
return int16(math.MaxInt16 * y / height2p)
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}
func vertices(parts ImageParts, width, height int, geo *GeoM) []uint8 {
// TODO: This function should be in graphics package?
totalSize := graphics.QuadVertexSizeInBytes()
oneSize := totalSize / 4
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l := parts.Len()
vertices := make([]uint8, l*totalSize)
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width2p := graphics.NextPowerOf2Int(width)
height2p := graphics.NextPowerOf2Int(height)
n := 0
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vs := make([]int16, 16)
geoBytes := floatBytes(geo.Element(0, 0),
geo.Element(0, 1),
geo.Element(1, 0),
geo.Element(1, 1),
geo.Element(0, 2),
geo.Element(1, 2))
for i := 0; i < l; i++ {
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dx0, dy0, dx1, dy1 := parts.Dst(i)
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if dx0 == dx1 || dy0 == dy1 {
continue
}
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x0, y0, x1, y1 := int16(dx0), int16(dy0), int16(dx1), int16(dy1)
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sx0, sy0, sx1, sy1 := parts.Src(i)
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if sx0 == sx1 || sy0 == sy1 {
continue
}
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u0, v0, u1, v1 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
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vs[0] = x0
vs[1] = y0
vs[2] = u0
vs[3] = v0
vs[4] = x1
vs[5] = y0
vs[6] = u1
vs[7] = v0
vs[8] = x0
vs[9] = y1
vs[10] = u0
vs[11] = v1
vs[12] = x1
vs[13] = y1
vs[14] = u1
vs[15] = v1
// Use direct assign here. `append` function might be slow on browsers.
for j := 0; j < 4; j++ {
offset := totalSize*n + oneSize*j
if endian.IsLittle() {
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// Subslicing like vs[4*j:4*j+4] is slow on browsers.
// Don't do this.
for k := 0; k < 4; k++ {
v := vs[4*j+k]
vertices[offset+2*k] = uint8(v)
vertices[offset+2*k+1] = uint8(v >> 8)
}
} else {
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for k := 0; k < 4; k++ {
v := vs[4*j+k]
vertices[offset+2*k] = uint8(v >> 8)
vertices[offset+2*k+1] = uint8(v)
}
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}
for k, g := range geoBytes {
vertices[offset+8+k] = g
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}
}
n++
}
return vertices[:n*totalSize]
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}