mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
128 lines
3.0 KiB
Go
128 lines
3.0 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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"fmt"
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"image"
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"math"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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// 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 int, width int) int {
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return math.MaxInt16 * x / int(graphics.NextPowerOf2Int32(int32(width)))
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}
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func v(y int, height int) int {
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return math.MaxInt16 * y / int(graphics.NextPowerOf2Int32(int32(height)))
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}
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type textureQuads struct {
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parts ImageParts
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width int
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height int
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}
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func (t *textureQuads) Len() int {
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return t.parts.Len()
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}
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func (t *textureQuads) SetVertices(vertices []int16) int {
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l := t.Len()
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if len(vertices) < l*16 {
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panic(fmt.Sprintf("grphics: vertices size must be greater than %d but %d", l*16, len(vertices)))
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}
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p := t.parts
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w, h := t.width, t.height
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n := 0
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for i := 0; i < l; i++ {
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x0, y0, x1, y1 := p.Dst(i)
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if x0 == x1 || y0 == y1 {
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continue
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}
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sx0, sy0, sx1, sy1 := p.Src(i)
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u0, v0, u1, v1 := u(sx0, w), v(sy0, h), u(sx1, w), v(sy1, h)
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if u0 == u1 || v0 == v1 {
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continue
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}
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vertices[16*n] = int16(x0)
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vertices[16*n+1] = int16(y0)
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vertices[16*n+2] = int16(u0)
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vertices[16*n+3] = int16(v0)
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vertices[16*n+4] = int16(x1)
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vertices[16*n+5] = int16(y0)
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vertices[16*n+6] = int16(u1)
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vertices[16*n+7] = int16(v0)
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vertices[16*n+8] = int16(x0)
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vertices[16*n+9] = int16(y1)
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vertices[16*n+10] = int16(u0)
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vertices[16*n+11] = int16(v1)
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vertices[16*n+12] = int16(x1)
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vertices[16*n+13] = int16(y1)
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vertices[16*n+14] = int16(u1)
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vertices[16*n+15] = int16(v1)
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n++
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}
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return n
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}
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