ebiten/internal/graphics/image.go

142 lines
3.2 KiB
Go

// 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"
"github.com/hajimehoshi/ebiten/internal/affine"
"github.com/hajimehoshi/ebiten/internal/math"
"github.com/hajimehoshi/ebiten/internal/opengl"
)
// Image represents an image that is implemented with OpenGL.
type Image struct {
texture *texture
framebuffer *framebuffer
width int
height int
}
// MaxImageSize is the maximum of width/height of an image.
const MaxImageSize = defaultViewportSize
func NewImage(width, height int) *Image {
i := &Image{
width: width,
height: height,
}
c := &newImageCommand{
result: i,
width: width,
height: height,
}
theCommandQueue.Enqueue(c)
return i
}
func NewImageFromImage(img *image.RGBA, width, height int) *Image {
i := &Image{
width: width,
height: height,
}
c := &newImageFromImageCommand{
result: i,
img: img,
}
theCommandQueue.Enqueue(c)
return i
}
func NewScreenFramebufferImage(width, height int, offsetX, offsetY float64) *Image {
i := &Image{
width: width,
height: height,
}
c := &newScreenFramebufferImageCommand{
result: i,
width: width,
height: height,
offsetX: offsetX,
offsetY: offsetY,
}
theCommandQueue.Enqueue(c)
return i
}
func (i *Image) Dispose() {
c := &disposeCommand{
target: i,
}
theCommandQueue.Enqueue(c)
}
func (i *Image) Size() (int, int) {
return i.width, i.height
}
func (i *Image) Fill(r, g, b, a uint8) {
c := &fillCommand{
dst: i,
}
c.color.R = r
c.color.G = g
c.color.B = b
c.color.A = a
theCommandQueue.Enqueue(c)
}
func (i *Image) DrawImage(src *Image, vertices []float32, clr *affine.ColorM, mode opengl.CompositeMode, filter Filter) {
theCommandQueue.EnqueueDrawImageCommand(i, src, vertices, clr, mode, filter)
}
func (i *Image) Pixels() ([]byte, error) {
// Flush the enqueued commands so that pixels are certainly read.
if err := theCommandQueue.Flush(); err != nil {
return nil, err
}
f, err := i.createFramebufferIfNeeded()
if err != nil {
return nil, err
}
return opengl.GetContext().FramebufferPixels(f.native, math.NextPowerOf2Int(i.width), math.NextPowerOf2Int(i.height))
}
func (i *Image) ReplacePixels(p []byte) {
pixels := make([]byte, len(p))
copy(pixels, p)
c := &replacePixelsCommand{
dst: i,
pixels: pixels,
}
theCommandQueue.Enqueue(c)
}
func (i *Image) IsInvalidated() bool {
return !opengl.GetContext().IsTexture(i.texture.native)
}
func (i *Image) createFramebufferIfNeeded() (*framebuffer, error) {
if i.framebuffer != nil {
return i.framebuffer, nil
}
f, err := newFramebufferFromTexture(i.texture, math.NextPowerOf2Int(i.width), math.NextPowerOf2Int(i.height))
if err != nil {
return nil, err
}
i.framebuffer = f
return i.framebuffer, nil
}