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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 (
"fmt"
"image"
"math"
"github.com/hajimehoshi/ebiten/internal/graphics"
)
// Deprecated (as of 1.1.0-alpha): Use ImageParts instead.
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)
}
// NOTE: Remove this in the future.
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
}
type uv struct {
width2p int
height2p int
}
func (c uv) u(x int) int16 {
return int16(math.MaxInt16 * x / c.width2p)
}
func (c uv) v(y int) int16 {
return int16(math.MaxInt16 * y / c.height2p)
}
type textureQuads struct {
parts ImageParts
width int
height int
}
func (t *textureQuads) vertices(vertices []int16) int {
l := t.parts.Len()
if len(vertices) < l*16 {
panic(fmt.Sprintf("graphics: vertices size must be greater than %d but %d", l*16, len(vertices)))
}
p := t.parts
w, h := t.width, t.height
n := 0
c := uv{
width2p: int(graphics.NextPowerOf2Int32(int32(w))),
height2p: int(graphics.NextPowerOf2Int32(int32(h))),
}
for i := 0; i < l; i++ {
dx0, dy0, dx1, dy1 := p.Dst(i)
if dx0 == dx1 || dy0 == dy1 {
continue
}
x0, y0, x1, y1 := int16(dx0), int16(dy0), int16(dx1), int16(dy1)
sx0, sy0, sx1, sy1 := p.Src(i)
if sx0 == sx1 || sy0 == sy1 {
continue
}
u0, v0, u1, v1 := c.u(sx0), c.v(sy0), c.u(sx1), c.v(sy1)
vertices[16*n] = x0
vertices[16*n+1] = y0
vertices[16*n+2] = u0
vertices[16*n+3] = v0
vertices[16*n+4] = x1
vertices[16*n+5] = y0
vertices[16*n+6] = u1
vertices[16*n+7] = v0
vertices[16*n+8] = x0
vertices[16*n+9] = y1
vertices[16*n+10] = u0
vertices[16*n+11] = v1
vertices[16*n+12] = x1
vertices[16*n+13] = y1
vertices[16*n+14] = u1
vertices[16*n+15] = v1
n++
}
return n
}