ebiten/internal/graphics/image.go

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// Copyright 2016 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 graphics
import (
"image"
"image/color"
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"image/draw"
"runtime"
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"github.com/hajimehoshi/ebiten/internal/affine"
"github.com/hajimehoshi/ebiten/internal/opengl"
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)
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func CopyImage(origImg image.Image) *image.RGBA {
size := origImg.Bounds().Size()
w, h := size.X, size.Y
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newImg := image.NewRGBA(image.Rect(0, 0, NextPowerOf2Int(w), NextPowerOf2Int(h)))
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switch origImg := origImg.(type) {
case *image.Paletted:
b := origImg.Bounds()
x0 := b.Min.X
y0 := b.Min.Y
x1 := b.Max.X
y1 := b.Max.Y
palette := make([]uint8, len(origImg.Palette)*4)
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for i, c := range origImg.Palette {
rgba := color.RGBAModel.Convert(c).(color.RGBA)
palette[4*i] = rgba.R
palette[4*i+1] = rgba.G
palette[4*i+2] = rgba.B
palette[4*i+3] = rgba.A
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}
index0 := 0
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index1 := 0
d0 := origImg.Stride - (x1 - x0)
d1 := newImg.Stride - (x1-x0)*4
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pix0 := origImg.Pix
pix1 := newImg.Pix
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for j := 0; j < y1-y0; j++ {
for i := 0; i < x1-x0; i++ {
p := int(pix0[index0])
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pix1[index1] = palette[4*p]
pix1[index1+1] = palette[4*p+1]
pix1[index1+2] = palette[4*p+2]
pix1[index1+3] = palette[4*p+3]
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index0++
index1 += 4
}
index0 += d0
index1 += d1
}
default:
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draw.Draw(newImg, image.Rect(0, 0, w, h), origImg, origImg.Bounds().Min, draw.Src)
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}
runtime.Gosched()
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return newImg
}
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type Image struct {
texture *texture
framebuffer *framebuffer
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width int
height int
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}
const MaxImageSize = viewportSize
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func NewImage(width, height int, filter opengl.Filter) *Image {
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i := &Image{
width: width,
height: height,
}
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c := &newImageCommand{
result: i,
width: width,
height: height,
filter: filter,
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}
theCommandQueue.Enqueue(c)
return i
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}
func NewImageFromImage(img *image.RGBA, width, height int, filter opengl.Filter) *Image {
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i := &Image{
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width: width,
height: height,
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}
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c := &newImageFromImageCommand{
result: i,
img: img,
filter: filter,
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}
theCommandQueue.Enqueue(c)
return i
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}
func NewScreenFramebufferImage(width, height int) *Image {
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i := &Image{
width: width,
height: height,
}
c := &newScreenFramebufferImageCommand{
result: i,
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width: width,
height: height,
}
theCommandQueue.Enqueue(c)
return i
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}
func (i *Image) Dispose() {
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c := &disposeCommand{
target: i,
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}
theCommandQueue.Enqueue(c)
}
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func (i *Image) Size() (int, int) {
return i.width, i.height
}
func (i *Image) Fill(clr color.RGBA) {
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// TODO: Need to clone clr value
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c := &fillCommand{
dst: i,
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color: clr,
}
theCommandQueue.Enqueue(c)
}
func (i *Image) DrawImage(src *Image, vertices []float32, clr affine.ColorM, mode opengl.CompositeMode) {
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c := &drawImageCommand{
dst: i,
src: src,
verticesNum: len(vertices),
color: clr,
mode: mode,
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}
theCommandQueue.AppendVertices(vertices)
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theCommandQueue.Enqueue(c)
}
func (i *Image) Pixels(context *opengl.Context) ([]uint8, error) {
// Flush the enqueued commands so that pixels are certainly read.
if err := theCommandQueue.Flush(context); err != nil {
return nil, err
}
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f, err := i.createFramebufferIfNeeded(context)
if err != nil {
return nil, err
}
return context.FramebufferPixels(f.native, NextPowerOf2Int(i.width), NextPowerOf2Int(i.height))
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}
func (i *Image) ReplacePixels(p []uint8) {
pixels := make([]uint8, len(p))
copy(pixels, p)
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c := &replacePixelsCommand{
dst: i,
pixels: pixels,
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}
theCommandQueue.Enqueue(c)
}
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func (i *Image) IsInvalidated(context *opengl.Context) bool {
return !context.IsTexture(i.texture.native)
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}
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func (i *Image) createFramebufferIfNeeded(context *opengl.Context) (*framebuffer, error) {
if i.framebuffer != nil {
return i.framebuffer, nil
}
f, err := newFramebufferFromTexture(context, i.texture)
if err != nil {
return nil, err
}
i.framebuffer = f
return i.framebuffer, nil
}