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 (
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"github.com/hajimehoshi/ebiten/internal/math"
"github.com/hajimehoshi/ebiten/internal/opengl"
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)
var (
// maxTextureSize is the maximum texture size
//
// maxTextureSize also represents the default size (width or height) of viewport.
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maxTextureSize = 0
)
// MaxImageSize returns the maximum of width/height of an image.
func MaxImageSize() int {
if maxTextureSize == 0 {
maxTextureSize = opengl.GetContext().MaxTextureSize()
if maxTextureSize == 0 {
panic("graphics: failed to get the max texture size")
}
}
s := maxTextureSize
return s
}
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// Image represents an image that is implemented with OpenGL.
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type Image struct {
texture *texture
framebuffer *framebuffer
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width int
height int
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}
func NewImage(width, height int) *Image {
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i := &Image{
width: width,
height: height,
}
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c := &newImageCommand{
result: i,
width: width,
height: height,
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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,
width: width,
height: height,
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}
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) DrawImage(src *Image, vertices []float32, indices []uint16, mode opengl.CompositeMode, filter Filter) {
theCommandQueue.EnqueueDrawImageCommand(i, src, vertices, indices, mode, filter)
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}
// Pixels returns the image's pixels.
// Pixels might return nil when OpenGL error happens.
func (i *Image) Pixels() []byte {
c := &pixelsCommand{
result: nil,
img: i,
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}
theCommandQueue.Enqueue(c)
theCommandQueue.Flush()
return c.result
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}
func (i *Image) ReplacePixels(p []byte, x, y, width, height int) {
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pixels := make([]byte, len(p))
copy(pixels, p)
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c := &replacePixelsCommand{
dst: i,
pixels: pixels,
x: x,
y: y,
width: width,
height: height,
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}
theCommandQueue.Enqueue(c)
}
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func (i *Image) IsInvalidated() bool {
return !opengl.GetContext().IsTexture(i.texture.native)
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}
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func (i *Image) createFramebufferIfNeeded() (*framebuffer, error) {
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if i.framebuffer != nil {
return i.framebuffer, nil
}
f, err := newFramebufferFromTexture(i.texture, math.NextPowerOf2Int(i.width), math.NextPowerOf2Int(i.height))
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if err != nil {
return nil, err
}
i.framebuffer = f
return i.framebuffer, nil
}