ebiten/image.go

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// Copyright 2014 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.
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package ebiten
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import (
"image"
"image/color"
"github.com/hajimehoshi/ebiten/internal/buffered"
"github.com/hajimehoshi/ebiten/internal/driver"
"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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// Image represents a rectangle set of pixels.
// The pixel format is alpha-premultiplied RGBA.
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// Image implements image.Image and draw.Image.
//
// Functions of Image never returns error as of 1.5.0-alpha, and error values are always nil.
type Image struct {
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// addr holds self to check copying.
// See strings.Builder for similar examples.
addr *Image
buffered *buffered.Image
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bounds image.Rectangle
original *Image
subs map[image.Rectangle]*Image
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filter Filter
disposed bool
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}
func (i *Image) copyCheck() {
if i.addr != i {
panic("ebiten: illegal use of non-zero Image copied by value")
}
}
// Size returns the size of the image.
func (i *Image) Size() (width, height int) {
s := i.Bounds().Size()
return s.X, s.Y
}
func (i *Image) isDisposed() bool {
return i.disposed
}
func (i *Image) isEmpty() bool {
return i.bounds.Dx() == 0 || i.bounds.Dy() == 0
}
func (i *Image) isSubImage() bool {
return i.original != nil
}
// Clear resets the pixels of the image into 0.
//
// When the image is disposed, Clear does nothing.
//
// Clear always returns nil as of 1.5.0-alpha.
func (i *Image) Clear() error {
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i.Fill(color.Transparent)
return nil
}
// Fill fills the image with a solid color.
//
// When the image is disposed, Fill does nothing.
//
// Fill always returns nil as of 1.5.0-alpha.
func (i *Image) Fill(clr color.Color) error {
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i.copyCheck()
if i.isDisposed() {
return nil
}
if i.isEmpty() {
return nil
}
// TODO: Implement this.
if i.isSubImage() {
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panic("ebiten: render to a subimage is not implemented (Fill)")
}
i.desyncSubImages()
i.buffered.Fill(color.RGBAModel.Convert(clr).(color.RGBA))
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return nil
}
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// DrawImage draws the given image on the image i.
//
// DrawImage accepts the options. For details, see the document of
// DrawImageOptions.
//
// For drawing, the pixels of the argument image at the time of this call is
// adopted. Even if the argument image is mutated after this call, the drawing
// result is never affected.
//
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// When the image i is disposed, DrawImage does nothing.
// When the given image img is disposed, DrawImage panics.
//
// When the given image is as same as i, DrawImage panics.
//
// DrawImage works more efficiently as batches
// when the successive calls of DrawImages satisfy the below conditions:
//
// * All render targets are same (A in A.DrawImage(B, op))
// * Either all ColorM element values are same or all the ColorM have only
// diagonal ('scale') elements
// * If only (*ColorM).Scale is applied to a ColorM, the ColorM has only
// diagonal elements. The other ColorM functions might modify the other
// elements.
// * All CompositeMode values are same
// * All Filter values are same
//
// Even when all the above conditions are satisfied, multiple draw commands can
// be used in really rare cases. Ebiten images usually share an internal
// automatic texture atlas, but when you consume the atlas, or you create a huge
// image, those images cannot be on the same texture atlas. In this case, draw
// commands are separated. The texture atlas size is 4096x4096 so far. Another
// case is when you use an offscreen as a render source. An offscreen doesn't
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// share the texture atlas with high probability.
//
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// For more performance tips, see https://ebiten.org/documents/performancetips.html
//
// DrawImage always returns nil as of 1.5.0-alpha.
func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
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i.copyCheck()
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if img.isDisposed() {
panic("ebiten: the given image to DrawImage must not be disposed")
}
if img.isEmpty() {
return nil
}
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if i.isDisposed() {
return nil
}
if i.isEmpty() {
return nil
}
// TODO: Implement this.
if i.isSubImage() {
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panic("ebiten: render to a subimage is not implemented (drawImage)")
}
if err := img.syncWithOriginalIfNeeded(); err != nil {
theUIContext.setError(err)
return nil
}
i.desyncSubImages()
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// Calculate vertices before locking because the user can do anything in
// options.ImageParts interface without deadlock (e.g. Call Image functions).
if options == nil {
options = &DrawImageOptions{}
}
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parts := options.ImageParts
// Parts is deprecated. This implementations is for backward compatibility.
if parts == nil && options.Parts != nil {
parts = imageParts(options.Parts)
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}
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// ImageParts is deprecated. This implementations is for backward compatibility.
if parts != nil {
l := parts.Len()
for idx := 0; idx < l; idx++ {
sx0, sy0, sx1, sy1 := parts.Src(idx)
dx0, dy0, dx1, dy1 := parts.Dst(idx)
op := &DrawImageOptions{
ColorM: options.ColorM,
CompositeMode: options.CompositeMode,
Filter: options.Filter,
}
op.GeoM.Scale(
float64(dx1-dx0)/float64(sx1-sx0),
float64(dy1-dy0)/float64(sy1-sy0))
op.GeoM.Translate(float64(dx0), float64(dy0))
op.GeoM.Concat(options.GeoM)
i.DrawImage(img.SubImage(image.Rect(sx0, sy0, sx1, sy1)).(*Image), op)
}
return nil
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}
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bounds := img.Bounds()
// SourceRect is deprecated. This implementation is for backward compatibility.
if options.SourceRect != nil {
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bounds = bounds.Intersect(*options.SourceRect)
if bounds.Empty() {
return nil
}
}
geom := &options.GeoM
mode := driver.CompositeMode(options.CompositeMode)
filter := driver.FilterNearest
if options.Filter != FilterDefault {
filter = driver.Filter(options.Filter)
} else if img.filter != FilterDefault {
filter = driver.Filter(img.filter)
}
a, b, c, d, tx, ty := geom.elements32()
w, h := img.Size()
i.buffered.DrawImage(img.buffered, image.Rect(0, 0, w, h), a, b, c, d, tx, ty, options.ColorM.impl, mode, filter)
return nil
}
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// Vertex represents a vertex passed to DrawTriangles.
//
// Note that this API is experimental.
type Vertex struct {
// DstX and DstY represents a point on a destination image.
DstX float32
DstY float32
// SrcX and SrcY represents a point on a source image.
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// Be careful that SrcX/SrcY coordinates are on the image's bounds.
// This means that a left-upper point of a sub-image might not be (0, 0).
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SrcX float32
SrcY float32
// ColorR/ColorG/ColorB/ColorA represents color scaling values.
// 1 means the original source image color is used.
// 0 means a transparent color is used.
ColorR float32
ColorG float32
ColorB float32
ColorA float32
}
// Address represents a sampler address mode.
type Address int
const (
// AddressClampToZero means that out-of-range texture coordinates return 0 (transparent).
AddressClampToZero Address = Address(driver.AddressClampToZero)
// AddressRepeat means that texture coordinates wrap to the other side of the texture.
AddressRepeat Address = Address(driver.AddressRepeat)
)
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// DrawTrianglesOptions represents options to render triangles on an image.
//
// Note that this API is experimental.
type DrawTrianglesOptions struct {
// ColorM is a color matrix to draw.
// The default (zero) value is identity, which doesn't change any color.
// ColorM is applied before vertex color scale is applied.
ColorM ColorM
// CompositeMode is a composite mode to draw.
// The default (zero) value is regular alpha blending.
CompositeMode CompositeMode
// Filter is a type of texture filter.
// The default (zero) value is FilterDefault.
Filter Filter
// Address is a sampler address mode.
// The default (zero) value is AddressClampToZero.
Address Address
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}
// MaxIndicesNum is the maximum number of indices for DrawTriangles.
const MaxIndicesNum = graphics.IndicesNum
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// DrawTriangles draws a triangle with the specified vertices and their indices.
//
// If len(indices) is not multiple of 3, DrawTriangles panics.
//
// If len(indices) is more than MaxIndicesNum, DrawTriangles panics.
//
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// The rule in which DrawTriangles works effectively is same as DrawImage's.
//
// When the image i is disposed, DrawTriangles does nothing.
//
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// Internal mipmap is not used on DrawTriangles.
//
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// Note that this API is experimental.
func (i *Image) DrawTriangles(vertices []Vertex, indices []uint16, img *Image, options *DrawTrianglesOptions) {
i.copyCheck()
if img.isDisposed() {
panic("ebiten: the given image to DrawTriangles must not be disposed")
}
if img.isEmpty() {
return
}
if i.isDisposed() {
return
}
if i.isSubImage() {
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panic("ebiten: render to a subimage is not implemented (DrawTriangles)")
}
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if len(indices)%3 != 0 {
panic("ebiten: len(indices) % 3 must be 0")
}
if len(indices) > MaxIndicesNum {
panic("ebiten: len(indices) must be <= MaxIndicesNum")
}
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// TODO: Check the maximum value of indices and len(vertices)?
if err := img.syncWithOriginalIfNeeded(); err != nil {
theUIContext.setError(err)
return
}
i.desyncSubImages()
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if options == nil {
options = &DrawTrianglesOptions{}
}
mode := driver.CompositeMode(options.CompositeMode)
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filter := driver.FilterNearest
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if options.Filter != FilterDefault {
filter = driver.Filter(options.Filter)
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} else if img.filter != FilterDefault {
filter = driver.Filter(img.filter)
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}
w, h := img.Size()
bx0 := float32(0)
by0 := float32(0)
bx1 := float32(w)
by1 := float32(h)
dx, dy := float32(img.Bounds().Min.X), float32(img.Bounds().Min.Y)
vs := make([]float32, len(vertices)*graphics.VertexFloatNum)
for i, v := range vertices {
vs[i*graphics.VertexFloatNum] = v.DstX
vs[i*graphics.VertexFloatNum+1] = v.DstY
vs[i*graphics.VertexFloatNum+2] = v.SrcX - dx
vs[i*graphics.VertexFloatNum+3] = v.SrcY - dy
vs[i*graphics.VertexFloatNum+4] = bx0
vs[i*graphics.VertexFloatNum+5] = by0
vs[i*graphics.VertexFloatNum+6] = bx1
vs[i*graphics.VertexFloatNum+7] = by1
vs[i*graphics.VertexFloatNum+8] = v.ColorR
vs[i*graphics.VertexFloatNum+9] = v.ColorG
vs[i*graphics.VertexFloatNum+10] = v.ColorB
vs[i*graphics.VertexFloatNum+11] = v.ColorA
}
is := make([]uint16, len(indices))
copy(is, indices)
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i.buffered.DrawTriangles(img.buffered, vs, is, options.ColorM.impl, mode, filter, driver.Address(options.Address), nil, nil)
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}
type DrawTrianglesWithShaderOptions struct {
Uniforms []interface{}
CompositeMode CompositeMode
}
// TODO: Add comments and tests
func (i *Image) DrawTrianglesWithShader(vertices []Vertex, indices []uint16, shader *Shader, options *DrawTrianglesWithShaderOptions) {
i.copyCheck()
if i.isDisposed() {
return
}
if i.isSubImage() {
panic("ebiten: render to a subimage is not implemented (DrawTriangles)")
}
if len(indices)%3 != 0 {
panic("ebiten: len(indices) % 3 must be 0")
}
if len(indices) > MaxIndicesNum {
panic("ebiten: len(indices) must be <= MaxIndicesNum")
}
i.desyncSubImages()
if options == nil {
options = &DrawTrianglesWithShaderOptions{}
}
mode := driver.CompositeMode(options.CompositeMode)
us := []interface{}{}
var firstImage *Image
for _, v := range options.Uniforms {
switch v := v.(type) {
case *Image:
if v.isDisposed() {
panic("ebiten: the given image to DrawTriangles must not be disposed")
}
if v.isEmpty() {
// TODO: Fix this
panic("ebiten: zero-sized image for DrawTrianglesWithShader is not implemented so far")
}
if err := v.syncWithOriginalIfNeeded(); err != nil {
theUIContext.setError(err)
return
}
us = append(us, v.buffered)
if firstImage == nil {
firstImage = v
} else {
w, h := v.Size()
us = append(us, []float32{
0,
0,
float32(w),
float32(h),
})
}
default:
us = append(us, v)
}
}
// The first uniform variable is Internal_ViewportSize.
// The actual value is set at graphicscommand package.
us = append([]interface{}{[]float32{0, 0}}, us...)
var dx, dy, bx0, by0, bx1, by1 float32
if firstImage != nil {
dx = float32(firstImage.Bounds().Min.X)
dy = float32(firstImage.Bounds().Min.Y)
w, h := firstImage.Size()
bx0 = float32(0)
by0 = float32(0)
bx1 = float32(w)
by1 = float32(h)
}
vs := make([]float32, len(vertices)*graphics.VertexFloatNum)
for i, v := range vertices {
vs[i*graphics.VertexFloatNum] = v.DstX
vs[i*graphics.VertexFloatNum+1] = v.DstY
vs[i*graphics.VertexFloatNum+2] = v.SrcX - dx
vs[i*graphics.VertexFloatNum+3] = v.SrcY - dy
vs[i*graphics.VertexFloatNum+4] = bx0
vs[i*graphics.VertexFloatNum+5] = by0
vs[i*graphics.VertexFloatNum+6] = bx1
vs[i*graphics.VertexFloatNum+7] = by1
vs[i*graphics.VertexFloatNum+8] = v.ColorR
vs[i*graphics.VertexFloatNum+9] = v.ColorG
vs[i*graphics.VertexFloatNum+10] = v.ColorB
vs[i*graphics.VertexFloatNum+11] = v.ColorA
}
is := make([]uint16, len(indices))
copy(is, indices)
i.buffered.DrawTriangles(nil, vs, is, nil, mode, driver.FilterNearest, driver.AddressClampToZero, shader.shader, us)
}
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// SubImage returns an image representing the portion of the image p visible through r.
// The returned value shares pixels with the original image.
//
// The returned value is always *ebiten.Image.
//
// If the image is disposed, SubImage returns nil.
//
// In the current Ebiten implementation, SubImage is available only as a rendering source.
func (i *Image) SubImage(r image.Rectangle) image.Image {
i.copyCheck()
if i.isDisposed() {
return nil
}
// TODO: Check that SubImage cannot be called on a screen image.
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r = r.Intersect(i.Bounds())
// Need to check Empty explicitly. See the standard image package implementations.
if r.Empty() {
r = image.ZR
}
// Keep the original image's reference not to dispose that by GC.
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var orig = i
if i.isSubImage() {
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orig = i.original
}
if sub, ok := orig.subs[r]; ok {
return sub
}
// In the initial state, the image doesn't have its own pixels.
// Sync with its original image when necessary.
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img := &Image{
filter: i.filter,
bounds: r,
original: orig,
}
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img.addr = img
orig.subs[img.Bounds()] = img
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return img
}
func (i *Image) desyncSubImages() {
if i.isSubImage() {
panic("ebiten: desyncSubImages must be called on an original image")
}
for _, s := range i.subs {
if s.buffered == nil {
continue
}
s.buffered.MarkDisposed()
s.buffered = nil
}
}
func (i *Image) syncWithOriginalIfNeeded() error {
if !i.isSubImage() {
return nil
}
if i.buffered != nil {
return nil
}
x, y, width, height := i.bounds.Min.X, i.bounds.Min.Y, i.bounds.Dx(), i.bounds.Dy()
i.buffered = buffered.NewImage(width, height, false)
if err := i.buffered.CopyPixels(i.original.buffered, x, y, width, height); err != nil {
return err
}
return nil
}
// Bounds returns the bounds of the image.
func (i *Image) Bounds() image.Rectangle {
if i.isDisposed() {
panic("ebiten: the image is already disposed")
}
return i.bounds
}
// ColorModel returns the color model of the image.
func (i *Image) ColorModel() color.Model {
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return color.RGBAModel
}
// At returns the color of the image at (x, y).
//
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// At loads pixels from GPU to system memory if necessary, which means that At can be slow.
//
// At always returns a transparent color if the image is disposed.
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//
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// Note that important logic should not rely on values returned by At, since
// the returned values can include very slight differences between some machines.
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//
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// At can't be called outside the main loop (ebiten.Run's updating function) starts (as of version 1.4.0-alpha).
func (i *Image) At(x, y int) color.Color {
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if i.isDisposed() {
return color.RGBA{}
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}
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if !image.Pt(x, y).In(i.Bounds()) {
return color.RGBA{}
}
if i.isSubImage() {
return i.original.At(x, y)
}
pix, err := i.buffered.Pixels(x, y, 1, 1)
if err != nil {
theUIContext.setError(err)
return color.RGBA{}
}
return color.RGBA{pix[0], pix[1], pix[2], pix[3]}
}
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// Set sets the color at (x, y).
//
// Set loads pixels from GPU to system memory if necessary, which means that Set can be slow.
//
// In the current implementation, successive calls of Set invokes loading pixels at most once, so this is efficient.
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//
// If the image is disposed, Set does nothing.
func (i *Image) Set(x, y int, clr color.Color) {
i.copyCheck()
if i.isDisposed() {
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return
}
if !image.Pt(x, y).In(i.Bounds()) {
return
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}
if i.isSubImage() {
i.original.Set(x, y, clr)
return
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}
r, g, b, a := clr.RGBA()
pix := []byte{byte(r >> 8), byte(g >> 8), byte(b >> 8), byte(a >> 8)}
if err := i.buffered.ReplacePixels(pix, x, y, 1, 1); err != nil {
theUIContext.setError(err)
return
}
i.desyncSubImages()
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}
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// Dispose disposes the image data.
// After disposing, most of image functions do nothing and returns meaningless values.
//
// If the callee is a sub-image, Dispose disposes only the callee.
// If the callee is not a sub-image, Dispose also diposes all its related sub-images.
//
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// Calling Dispose is not mandatory. GC automatically collects internal resources that no objects refer to.
// However, calling Dispose explicitly is helpful if memory usage matters.
//
// When the image is disposed, Dipose does nothing.
//
// Dipose always return nil as of 1.5.0-alpha.
func (i *Image) Dispose() error {
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i.copyCheck()
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if i.isDisposed() {
return nil
}
// Get the bound before the image is disposed.
b := i.Bounds()
if i.buffered != nil {
i.buffered.MarkDisposed()
i.buffered = nil
}
i.disposed = true
// If a sub-image is disposed, dispose only this image.
if i.isSubImage() {
delete(i.original.subs, b)
return nil
}
for _, s := range i.subs {
s.Dispose()
}
return nil
}
// ReplacePixels replaces the pixels of the image with p.
//
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// The given p must represent RGBA pre-multiplied alpha values.
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// len(pix) must equal to 4 * (bounds width) * (bounds height).
//
// ReplacePixels works on a sub-image.
//
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// When len(pix) is not appropriate, ReplacePixels panics.
//
// When the image is disposed, ReplacePixels does nothing.
//
// ReplacePixels always returns nil as of 1.5.0-alpha.
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func (i *Image) ReplacePixels(pix []byte) error {
// TODO: This is not very efficient. Fix this.
if i.isSubImage() {
i.original.replacePixels(pix, i.Bounds().Min.X, i.Bounds().Min.Y, i.Bounds().Dx(), i.Bounds().Dy())
return nil
}
w, h := i.Size()
i.replacePixels(pix, 0, 0, w, h)
return nil
}
func (i *Image) replacePixels(pix []byte, x, y, width, height int) {
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i.copyCheck()
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if i.isDisposed() {
return
}
if i.isEmpty() {
return
}
if i.isSubImage() {
panic("ebiten: replacePixels must be called on an original image")
}
if err := i.buffered.ReplacePixels(pix, x, y, width, height); err != nil {
theUIContext.setError(err)
return
}
i.desyncSubImages()
}
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// A DrawImageOptions represents options to render an image on an image.
type DrawImageOptions struct {
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// GeoM is a geometry matrix to draw.
// The default (zero) value is identify, which draws the image at (0, 0).
GeoM GeoM
// ColorM is a color matrix to draw.
// The default (zero) value is identity, which doesn't change any color.
ColorM ColorM
// CompositeMode is a composite mode to draw.
// The default (zero) value is regular alpha blending.
CompositeMode CompositeMode
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// Filter is a type of texture filter.
// The default (zero) value is FilterDefault.
//
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// Filter can also be specified at NewImage* functions, but
// specifying filter at DrawImageOptions is recommended (as of 1.7.0-alpha).
//
// If both Filter specified at NewImage* and DrawImageOptions are FilterDefault,
// FilterNearest is used.
// If either is FilterDefault and the other is not, the latter is used.
// Otherwise, Filter specified at DrawImageOptions is used.
Filter Filter
// Deprecated: (as of 1.5.0) Use SubImage instead.
ImageParts ImageParts
// Deprecated: (as of 1.1.0) Use SubImage instead.
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Parts []ImagePart
// Deprecated: (as of 1.9.0) Use SubImage instead.
SourceRect *image.Rectangle
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}
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// NewImage returns an empty image.
//
// If width or height is less than 1 or more than device-dependent maximum size, NewImage panics.
//
// filter argument is just for backward compatibility.
// If you are not sure, specify FilterDefault.
//
// Error returned by NewImage is always nil as of 1.5.0-alpha.
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func NewImage(width, height int, filter Filter) (*Image, error) {
return newImage(width, height, filter, false), nil
}
func newImage(width, height int, filter Filter, volatile bool) *Image {
i := &Image{
buffered: buffered.NewImage(width, height, volatile),
filter: filter,
bounds: image.Rect(0, 0, width, height),
subs: map[image.Rectangle]*Image{},
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}
i.addr = i
return i
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}
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// NewImageFromImage creates a new image with the given image (source).
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//
// If source's width or height is less than 1 or more than device-dependent maximum size, NewImageFromImage panics.
//
// filter argument is just for backward compatibility.
// If you are not sure, specify FilterDefault.
//
// Error returned by NewImageFromImage is always nil as of 1.5.0-alpha.
func NewImageFromImage(source image.Image, filter Filter) (*Image, error) {
size := source.Bounds().Size()
width, height := size.X, size.Y
i := &Image{
buffered: buffered.NewImage(width, height, false),
filter: filter,
bounds: image.Rect(0, 0, width, height),
subs: map[image.Rectangle]*Image{},
}
i.addr = i
_ = i.ReplacePixels(copyImage(source))
return i, nil
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}
func newScreenFramebufferImage(width, height int) *Image {
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i := &Image{
buffered: buffered.NewScreenFramebufferImage(width, height),
filter: FilterDefault,
bounds: image.Rect(0, 0, width, height),
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}
i.addr = i
return i
}
// MaxImageSize represented the maximum size of an image, but now this constant is deprecated.
//
// Deprecated: (as of 1.7.0) No replacement so far.
//
// TODO: Make this replacement (#541)
var MaxImageSize = 4096