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 (
"fmt"
"image"
"image/color"
"math"
"runtime"
"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/shareable"
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)
// emptyImage is an empty image used for filling other images with a uniform color.
//
// Do not call Fill or Clear on emptyImage or the program causes infinite recursion.
var emptyImage *Image
func init() {
emptyImage, _ = NewImage(16, 16, FilterDefault)
}
type mipmap struct {
orig *shareable.Image
imgs map[image.Rectangle][]*shareable.Image
}
func newMipmap(s *shareable.Image) *mipmap {
return &mipmap{
orig: s,
imgs: map[image.Rectangle][]*shareable.Image{},
}
}
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func (m *mipmap) original() *shareable.Image {
return m.orig
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}
func (m *mipmap) level(r image.Rectangle, level int) *shareable.Image {
if level == 0 {
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panic("not reached")
}
imgs, ok := m.imgs[r]
if !ok {
imgs = []*shareable.Image{}
m.imgs[r] = imgs
}
idx := level - 1
size := r.Size()
w, h := size.X, size.Y
if len(imgs) > 0 {
w, h = imgs[len(imgs)-1].Size()
}
for len(imgs) < idx+1 {
w2 := w / 2
h2 := h / 2
if w2 == 0 || h2 == 0 {
return nil
}
var s *shareable.Image
if m.orig.IsVolatile() {
s = shareable.NewVolatileImage(w2, h2)
} else {
s = shareable.NewImage(w2, h2)
}
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var src *shareable.Image
var vs []float32
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if l := len(imgs); l == 0 {
src = m.orig
vs = src.QuadVertices(r.Min.X, r.Min.Y, r.Max.X, r.Max.Y, 0.5, 0, 0, 0.5, 0, 0, 1, 1, 1, 1)
} else {
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src = m.level(r, l)
vs = src.QuadVertices(0, 0, w, h, 0.5, 0, 0, 0.5, 0, 0, 1, 1, 1, 1)
}
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is := graphics.QuadIndices()
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s.DrawImage(src, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterLinear)
imgs = append(imgs, s)
w = w2
h = h2
}
m.imgs[r] = imgs
if len(imgs) <= idx {
return nil
}
return imgs[idx]
}
func (m *mipmap) isDisposed() bool {
return m.orig == nil
}
func (m *mipmap) dispose() {
m.disposeMipmaps()
m.orig.Dispose()
m.orig = nil
}
func (m *mipmap) disposeMipmaps() {
for _, a := range m.imgs {
for _, img := range a {
img.Dispose()
}
}
m.imgs = map[image.Rectangle][]*shareable.Image{}
}
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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.
//
// 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
// mipmap is a set of shareable.Image sorted by the order of mipmap level.
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// The level 0 image is a regular image and higher-level images are used for mipmap.
mipmap *mipmap
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bounds *image.Rectangle
original *Image
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filter Filter
}
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.mipmap.isDisposed()
}
func (i *Image) isSubimage() bool {
return i.bounds != 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.copyCheck()
if i.isDisposed() {
return nil
}
// TODO: Implement this.
if i.isSubimage() {
panic("render to a subimage is not implemented")
}
i.fill(0, 0, 0, 0)
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
}
// TODO: Implement this.
if i.isSubimage() {
panic("render to a subimage is not implemented")
}
r, g, b, a := clr.RGBA()
i.fill(uint8(r>>8), uint8(g>>8), uint8(b>>8), uint8(a>>8))
return nil
}
func (i *Image) fill(r, g, b, a uint8) {
if r == 0 && g == 0 && b == 0 && a == 0 {
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i.mipmap.original().ReplacePixels(nil)
i.disposeMipmaps()
return
}
wd, hd := i.Size()
if wd*hd <= 256 {
// Prefer ReplacePixels since ReplacePixels can keep the images shared.
pix := make([]uint8, 4*wd*hd)
for i := 0; i < wd*hd; i++ {
pix[4*i] = r
pix[4*i+1] = g
pix[4*i+2] = b
pix[4*i+3] = a
}
i.ReplacePixels(pix)
return
}
ws, hs := emptyImage.Size()
sw := float64(wd) / float64(ws)
sh := float64(hd) / float64(hs)
op := &DrawImageOptions{}
op.GeoM.Scale(sw, sh)
if a > 0 {
rf := float64(r) / float64(a)
gf := float64(g) / float64(a)
bf := float64(b) / float64(a)
af := float64(a) / 0xff
op.ColorM.Translate(rf, gf, bf, af)
}
op.CompositeMode = CompositeModeCopy
op.Filter = FilterNearest
i.drawImage(emptyImage, op)
}
func (i *Image) disposeMipmaps() {
if i.isDisposed() {
panic("not reached")
}
i.mipmap.disposeMipmaps()
}
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// DrawImage draws the given image on the image i.
//
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// DrawImage accepts the options. For details, see the document of DrawImageOptions.
//
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// DrawImage determines the part to draw, then DrawImage applies the geometry matrix and the color matrix.
//
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// 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 satisfies the below conditions:
//
// * All render targets are same (A in A.DrawImage(B, op))
// * All render sources are same (B in A.DrawImage(B, op))
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// * This is not a strong request since different images might share a same inner
// OpenGL texture in high possibility. This is not 100%, so using the same render
// source is safer.
// * All ColorM values are same, or all the ColorM have only 'scale' operations
// * All CompositeMode values are same
// * All Filter values are same
//
// For more performance tips, see https://github.com/hajimehoshi/ebiten/wiki/Performance-Tips.
//
// DrawImage always returns nil as of 1.5.0-alpha.
func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
i.drawImage(img, options)
return nil
}
func (i *Image) drawImage(img *Image, options *DrawImageOptions) {
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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 i.isDisposed() {
return
}
// TODO: Implement this.
if i.isSubimage() {
panic("render to a subimage is not implemented")
}
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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,
}
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
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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
}
}
geom := &options.GeoM
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mode := graphics.CompositeMode(options.CompositeMode)
filter := graphics.FilterNearest
if options.Filter != FilterDefault {
filter = graphics.Filter(options.Filter)
} else if img.filter != FilterDefault {
filter = graphics.Filter(img.filter)
}
a, b, c, d, tx, ty := geom.elements()
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level := 0
if filter == graphics.FilterLinear {
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det := geom.det()
if det == 0 {
return
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}
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if math.IsNaN(float64(det)) {
return
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}
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level = graphics.MipmapLevel(det)
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if level < 0 {
panic("not reached")
}
}
if level > 6 {
level = 6
}
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// TODO: Add (*mipmap).drawImage and move the below code.
colorm := options.ColorM.impl
cr, cg, cb, ca := float32(1), float32(1), float32(1), float32(1)
if colorm.ScaleOnly() {
body, _ := colorm.UnsafeElements()
cr = body[0]
cg = body[5]
cb = body[10]
ca = body[15]
colorm = nil
}
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if level == 0 {
src := img.mipmap.original()
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vs := src.QuadVertices(bounds.Min.X, bounds.Min.Y, bounds.Max.X, bounds.Max.Y, a, b, c, d, tx, ty, cr, cg, cb, ca)
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is := graphics.QuadIndices()
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i.mipmap.original().DrawImage(src, vs, is, colorm, mode, filter)
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} else if src := img.mipmap.level(bounds, level); src != nil {
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w, h := src.Size()
s := 1 << uint(level)
a *= float32(s)
b *= float32(s)
c *= float32(s)
d *= float32(s)
vs := src.QuadVertices(0, 0, w, h, a, b, c, d, tx, ty, cr, cg, cb, ca)
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is := graphics.QuadIndices()
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i.mipmap.original().DrawImage(src, vs, is, colorm, mode, filter)
}
i.disposeMipmaps()
}
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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.
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
}
// 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
}
// 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.
//
// In contrast to DrawImage, DrawTriangles doesn't care source image edges.
// This means that you might need to add 1px gap on a source region when you render an image by DrawTriangles.
// Note that Ebiten creates texture atlases internally, so you still have to care this even when
// you render a single image.
//
// 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 i.isDisposed() {
return
}
// TODO: Implement this.
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if img.isSubimage() {
panic("using a subimage at DrawTriangles is not implemented")
}
if i.isSubimage() {
panic("render to a subimage is not implemented")
}
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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 options == nil {
options = &DrawTrianglesOptions{}
}
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mode := graphics.CompositeMode(options.CompositeMode)
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filter := graphics.FilterNearest
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if options.Filter != FilterDefault {
filter = graphics.Filter(options.Filter)
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} else if img.filter != FilterDefault {
filter = graphics.Filter(img.filter)
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}
vs := make([]float32, len(vertices)*graphics.VertexFloatNum)
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src := img.mipmap.original()
for idx, v := range vertices {
src.PutVertex(vs[idx*graphics.VertexFloatNum:(idx+1)*graphics.VertexFloatNum], float32(v.DstX), float32(v.DstY), v.SrcX, v.SrcY, v.ColorR, v.ColorG, v.ColorB, v.ColorA)
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}
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i.mipmap.original().DrawImage(img.mipmap.original(), vs, indices, options.ColorM.impl, mode, filter)
i.disposeMipmaps()
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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
}
img := &Image{
mipmap: i.mipmap,
filter: i.filter,
}
// Keep the original image's reference not to dispose that by GC.
if i.isSubimage() {
img.original = i.original
} else {
img.original = i
}
img.addr = img
runtime.SetFinalizer(img, (*Image).Dispose)
r = r.Intersect(img.Bounds())
// Need to check Empty explicitly. See the standard image package implementations.
if r.Empty() {
img.bounds = &image.ZR
} else {
img.bounds = &r
}
return img
}
// Bounds returns the bounds of the image.
func (i *Image) Bounds() image.Rectangle {
if i.bounds == nil {
w, h := i.mipmap.original().Size()
return image.Rect(0, 0, w, h)
}
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 At result since
// At might include a very slight error on some machines.
//
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// At can't be called before the main loop (ebiten.Run) 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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}
if i.bounds != nil && !image.Pt(x, y).In(*i.bounds) {
return color.RGBA{}
}
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return i.mipmap.original().At(x, y)
}
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// Dispose disposes the image data. After disposing, most of image functions do nothing and returns meaningless values.
//
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// Dispose is useful to save memory.
//
// 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
}
if !i.isSubimage() {
i.mipmap.dispose()
}
runtime.SetFinalizer(i, nil)
return nil
}
// ReplacePixels replaces the pixels of the image with p.
//
// The given p must represent RGBA pre-multiplied alpha values. len(p) must equal to 4 * (image width) * (image height).
//
// ReplacePixels may be slow (as for implementation, this calls glTexSubImage2D).
//
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// When len(p) 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(p []byte) error {
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i.copyCheck()
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if i.isDisposed() {
return nil
}
// TODO: Implement this.
if i.isSubimage() {
panic("render to a subimage is not implemented")
}
s := i.Bounds().Size()
if l := 4 * s.X * s.Y; len(p) != l {
panic(fmt.Sprintf("ebiten: len(p) was %d but must be %d", len(p), l))
}
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i.mipmap.original().ReplacePixels(p)
i.disposeMipmaps()
return nil
}
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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-alpha): Use SubImage instead.
ImageParts ImageParts
// Deprecated (as of 1.1.0-alpha): Use SubImage instead.
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Parts []ImagePart
// Deprecated (as of 1.9.0-alpha): 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) {
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s := shareable.NewImage(width, height)
i := &Image{
mipmap: newMipmap(s),
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filter: filter,
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}
i.addr = i
runtime.SetFinalizer(i, (*Image).Dispose)
return i, nil
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}
// newVolatileImage returns an empty 'volatile' image.
// A volatile image is always cleared at the start of a frame.
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//
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// This is suitable for offscreen images that pixels are changed often.
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//
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// Pixels in regular non-volatile images are saved at each end of a frame if the image
// is changed, and restored automatically from the saved pixels on GL context lost.
// On the other hand, pixels in volatile images are not saved.
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// Saving pixels is an expensive operation, and it is desirable to avoid it if possible.
//
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// Note that volatile images are internal only and will never be source of drawing.
//
// If width or height is less than 1 or more than device-dependent maximum size, newVolatileImage panics.
func newVolatileImage(width, height int) *Image {
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i := &Image{
mipmap: newMipmap(shareable.NewVolatileImage(width, height)),
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}
i.addr = i
runtime.SetFinalizer(i, (*Image).Dispose)
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
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s := shareable.NewImage(width, height)
i := &Image{
mipmap: newMipmap(s),
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filter: filter,
}
i.addr = i
runtime.SetFinalizer(i, (*Image).Dispose)
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_ = i.ReplacePixels(graphics.CopyImage(source))
return i, nil
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}
func newImageWithScreenFramebuffer(width, height int) *Image {
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i := &Image{
mipmap: newMipmap(shareable.NewScreenFramebufferImage(width, height)),
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filter: FilterDefault,
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}
i.addr = i
runtime.SetFinalizer(i, (*Image).Dispose)
return i
}
// MaxImageSize is deprecated as of 1.7.0-alpha. No replacement so far.
//
// TODO: Make this replacement (#541)
var MaxImageSize = 4096