mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
132 lines
3.2 KiB
Go
132 lines
3.2 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ebiten
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import (
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"image"
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"math"
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"github.com/hajimehoshi/ebiten/internal/endian"
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"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 {
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Dst image.Rectangle
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Src image.Rectangle
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}
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// An ImageParts represents the parts of the destination image and the parts of the source image.
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type ImageParts interface {
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Len() int
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Dst(i int) (x0, y0, x1, y1 int)
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Src(i int) (x0, y0, x1, y1 int)
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}
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// NOTE: Remove this in the future.
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type imageParts []ImagePart
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func (p imageParts) Len() int {
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return len(p)
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}
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func (p imageParts) Dst(i int) (x0, y0, x1, y1 int) {
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dst := &p[i].Dst
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return dst.Min.X, dst.Min.Y, dst.Max.X, dst.Max.Y
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}
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func (p imageParts) Src(i int) (x0, y0, x1, y1 int) {
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src := &p[i].Src
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return src.Min.X, src.Min.Y, src.Max.X, src.Max.Y
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}
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type wholeImage struct {
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width int
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height int
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}
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func (w *wholeImage) Len() int {
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return 1
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}
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func (w *wholeImage) Dst(i int) (x0, y0, x1, y1 int) {
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return 0, 0, w.width, w.height
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}
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func (w *wholeImage) Src(i int) (x0, y0, x1, y1 int) {
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return 0, 0, w.width, w.height
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}
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func u(x, width2p int) int16 {
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return int16(math.MaxInt16 * x / width2p)
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}
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func v(y, height2p int) int16 {
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return int16(math.MaxInt16 * y / height2p)
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}
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func vertices(parts ImageParts, width, height int) []uint8 {
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totalSize := graphics.QuadVertexSizeInBytes()
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oneSize := totalSize / 4
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l := parts.Len()
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vertices := make([]uint8, l*totalSize)
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width2p := graphics.NextPowerOf2Int(width)
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height2p := graphics.NextPowerOf2Int(height)
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n := 0
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vs := make([]int16, 16)
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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 {
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continue
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}
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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 {
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continue
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}
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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
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vs[1] = y0
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vs[2] = u0
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vs[3] = v0
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vs[4] = x1
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vs[5] = y0
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vs[6] = u1
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vs[7] = v0
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vs[8] = x0
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vs[9] = y1
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vs[10] = u0
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vs[11] = v1
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vs[12] = x1
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vs[13] = y1
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vs[14] = u1
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vs[15] = v1
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// Use direct assign here. `append` function might be slow on browsers.
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if endian.IsLittle() {
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for i, v := range vs {
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vertices[totalSize*n+oneSize*(i/4)+2*(i%4)] = uint8(v)
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vertices[totalSize*n+oneSize*(i/4)+2*(i%4)+1] = uint8(v >> 8)
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}
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} else {
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for i, v := range vs {
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vertices[totalSize*n+oneSize*(i/4)+2*(i%4)] = uint8(v >> 8)
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vertices[totalSize*n+oneSize*(i/4)+2*(i%4)+1] = uint8(v)
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}
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}
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n++
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}
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return vertices[:n*totalSize]
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}
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