ebiten/internal/buffered/image.go

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// Copyright 2019 The Ebiten Authors
//
// 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 buffered
import (
"fmt"
"image"
"github.com/hajimehoshi/ebiten/v2/internal/atlas"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
)
type Image struct {
img *atlas.Image
width int
height int
pixels []byte
}
func BeginFrame(graphicsDriver graphicsdriver.Graphics) error {
if err := atlas.BeginFrame(graphicsDriver); err != nil {
return err
}
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flushDelayedCommands()
return nil
}
func EndFrame(graphicsDriver graphicsdriver.Graphics) error {
return atlas.EndFrame(graphicsDriver)
}
func NewImage(width, height int, imageType atlas.ImageType) *Image {
i := &Image{
width: width,
height: height,
}
i.initialize(imageType)
return i
}
func (i *Image) initialize(imageType atlas.ImageType) {
if maybeCanAddDelayedCommand() {
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if tryAddDelayedCommand(func() {
i.initialize(imageType)
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}) {
return
}
}
i.img = atlas.NewImage(i.width, i.height, imageType)
}
func (i *Image) invalidatePixels() {
i.pixels = nil
}
func (i *Image) MarkDisposed() {
if maybeCanAddDelayedCommand() {
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if tryAddDelayedCommand(func() {
i.MarkDisposed()
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}) {
return
}
}
i.invalidatePixels()
i.img.MarkDisposed()
}
func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, x, y, width, height int) error {
checkDelayedCommandsFlushed("ReadPixels")
r := image.Rect(x, y, x+width, y+height).Intersect(image.Rect(0, 0, i.width, i.height))
if r.Empty() {
for i := range pixels {
pixels[i] = 0
}
return nil
}
if i.pixels == nil {
pix := make([]byte, 4*i.width*i.height)
if err := i.img.ReadPixels(graphicsDriver, pix); err != nil {
return err
}
i.pixels = pix
}
dstBaseX := r.Min.X - x
dstBaseY := r.Min.Y - y
srcBaseX := r.Min.X
srcBaseY := r.Min.Y
lineWidth := 4 * r.Dx()
for j := 0; j < r.Dy(); j++ {
dstX := 4 * ((dstBaseY+j)*width + dstBaseX)
srcX := 4 * ((srcBaseY+j)*i.width + srcBaseX)
copy(pixels[dstX:dstX+lineWidth], i.pixels[srcX:srcX+lineWidth])
}
return nil
}
func (i *Image) DumpScreenshot(graphicsDriver graphicsdriver.Graphics, name string, blackbg bool) (string, error) {
checkDelayedCommandsFlushed("Dump")
return i.img.DumpScreenshot(graphicsDriver, name, blackbg)
}
// WritePixels replaces the pixels at the specified region.
func (i *Image) WritePixels(pix []byte, x, y, width, height int) {
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if l := 4 * width * height; len(pix) != l {
panic(fmt.Sprintf("buffered: len(pix) was %d but must be %d", len(pix), l))
}
if maybeCanAddDelayedCommand() {
copied := make([]byte, len(pix))
copy(copied, pix)
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if tryAddDelayedCommand(func() {
i.WritePixels(copied, x, y, width, height)
}) {
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return
}
}
i.invalidatePixels()
i.img.WritePixels(pix, x, y, width, height)
}
// DrawTriangles draws the src image with the given vertices.
//
// Copying vertices and indices is the caller's responsibility.
func (i *Image) DrawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices []float32, indices []uint16, blend graphicsdriver.Blend, dstRegion, srcRegion graphicsdriver.Region, subimageOffsets [graphics.ShaderImageCount - 1][2]float32, shader *Shader, uniforms [][]float32, evenOdd bool) {
for _, src := range srcs {
if i == src {
panic("buffered: Image.DrawTriangles: source images must be different from the receiver")
}
}
if maybeCanAddDelayedCommand() {
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if tryAddDelayedCommand(func() {
// Arguments are not copied. Copying is the caller's responsibility.
i.DrawTriangles(srcs, vertices, indices, blend, dstRegion, srcRegion, subimageOffsets, shader, uniforms, evenOdd)
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}) {
return
}
}
var imgs [graphics.ShaderImageCount]*atlas.Image
for i, img := range srcs {
if img == nil {
continue
}
imgs[i] = img.img
}
i.invalidatePixels()
i.img.DrawTriangles(imgs, vertices, indices, blend, dstRegion, srcRegion, subimageOffsets, shader.shader, uniforms, evenOdd)
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}
type Shader struct {
shader *atlas.Shader
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}
func NewShader(ir *shaderir.Program) *Shader {
s := &Shader{}
s.initialize(ir)
return s
}
func (s *Shader) initialize(ir *shaderir.Program) {
if maybeCanAddDelayedCommand() {
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if tryAddDelayedCommand(func() {
s.initialize(ir)
}) {
return
}
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}
s.shader = atlas.NewShader(ir)
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}
func (s *Shader) MarkDisposed() {
if maybeCanAddDelayedCommand() {
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if tryAddDelayedCommand(func() {
s.MarkDisposed()
}) {
return
}
}
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s.shader.MarkDisposed()
s.shader = nil
}
var (
NearestFilterShader = &Shader{shader: atlas.NearestFilterShader}
LinearFilterShader = &Shader{shader: atlas.LinearFilterShader}
)