ebiten/internal/ui/image.go

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// Copyright 2022 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 ui
import (
"fmt"
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"image"
"math"
"github.com/hajimehoshi/ebiten/v2/internal/atlas"
"github.com/hajimehoshi/ebiten/v2/internal/graphics"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
)
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// panicOnErrorOnReadingPixels indicates whether reading pixels panics on an error or not.
// This value is set only on testing.
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var panicOnErrorOnReadingPixels bool
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func SetPanicOnErrorOnReadingPixelsForTesting(value bool) {
panicOnErrorOnReadingPixels = value
}
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const bigOffscreenScale = 2
type Image struct {
ui *UserInterface
mipmap *mipmap.Mipmap
width int
height int
imageType atlas.ImageType
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dotsBuffer map[image.Point][4]byte
// lastBlend is the lastly-used blend for mipmap.Image.
lastBlend graphicsdriver.Blend
// bigOffscreenBuffer is a double-sized offscreen for anti-alias rendering.
bigOffscreenBuffer *bigOffscreenImage
// modifyCallback is a callback called when DrawTriangles or WritePixels is called.
// modifyCallback is useful to detect whether the image is manipulated or not after a certain time.
modifyCallback func()
tmpVerticesForFill []float32
}
func (u *UserInterface) NewImage(width, height int, imageType atlas.ImageType) *Image {
return &Image{
ui: u,
mipmap: mipmap.New(width, height, imageType),
width: width,
height: height,
imageType: imageType,
lastBlend: graphicsdriver.BlendSourceOver,
}
}
func (i *Image) MarkDisposed() {
if i.mipmap == nil {
return
}
if i.bigOffscreenBuffer != nil {
i.bigOffscreenBuffer.markDisposed()
i.bigOffscreenBuffer = nil
}
i.mipmap.MarkDisposed()
i.mipmap = nil
i.dotsBuffer = nil
i.modifyCallback = nil
}
func (i *Image) DrawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices []float32, indices []uint16, blend graphicsdriver.Blend, dstRegion image.Rectangle, srcRegions [graphics.ShaderImageCount]image.Rectangle, shader *Shader, uniforms []uint32, evenOdd bool, canSkipMipmap bool, antialias bool) {
if i.modifyCallback != nil {
i.modifyCallback()
}
i.lastBlend = blend
if antialias {
// Flush the other buffer to make the buffers exclusive.
i.flushDotsBufferIfNeeded()
if i.bigOffscreenBuffer == nil {
var imageType atlas.ImageType
switch i.imageType {
case atlas.ImageTypeRegular, atlas.ImageTypeUnmanaged:
imageType = atlas.ImageTypeUnmanaged
case atlas.ImageTypeScreen, atlas.ImageTypeVolatile:
imageType = atlas.ImageTypeVolatile
default:
panic(fmt.Sprintf("ui: unexpected image type: %d", imageType))
}
i.bigOffscreenBuffer = i.ui.newBigOffscreenImage(i, imageType)
}
i.bigOffscreenBuffer.drawTriangles(srcs, vertices, indices, blend, dstRegion, srcRegions, shader, uniforms, evenOdd, canSkipMipmap, false)
return
}
i.flushBufferIfNeeded()
var srcMipmaps [graphics.ShaderImageCount]*mipmap.Mipmap
for i, src := range srcs {
if src == nil {
continue
}
src.flushBufferIfNeeded()
srcMipmaps[i] = src.mipmap
}
i.mipmap.DrawTriangles(srcMipmaps, vertices, indices, blend, dstRegion, srcRegions, shader.shader, uniforms, evenOdd, canSkipMipmap)
}
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func (i *Image) WritePixels(pix []byte, region image.Rectangle) {
if i.modifyCallback != nil {
i.modifyCallback()
}
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if region.Dx() == 1 && region.Dy() == 1 {
// Flush the other buffer to make the buffers exclusive.
i.flushBigOffscreenBufferIfNeeded()
if i.dotsBuffer == nil {
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i.dotsBuffer = map[image.Point][4]byte{}
}
var clr [4]byte
copy(clr[:], pix)
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i.dotsBuffer[region.Min] = clr
// One square requires 6 indices (= 2 triangles).
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if len(i.dotsBuffer) >= graphics.MaxVerticesCount/6 {
i.flushDotsBufferIfNeeded()
}
return
}
i.flushBufferIfNeeded()
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i.mipmap.WritePixels(pix, region)
}
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func (i *Image) ReadPixels(pixels []byte, region image.Rectangle) {
// Check the error existence and avoid unnecessary calls.
if i.ui.error() != nil {
return
}
i.flushBigOffscreenBufferIfNeeded()
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if region.Dx() == 1 && region.Dy() == 1 {
if c, ok := i.dotsBuffer[region.Min]; ok {
copy(pixels, c[:])
return
}
// Do not call flushDotsBufferIfNeeded here. This would slow (image/draw).Draw.
// See ebiten.TestImageDrawOver.
} else {
i.flushDotsBufferIfNeeded()
}
if err := i.ui.readPixels(i.mipmap, pixels, region); err != nil {
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if panicOnErrorOnReadingPixels {
panic(err)
}
i.ui.setError(err)
}
}
func (i *Image) DumpScreenshot(name string, blackbg bool) (string, error) {
i.flushBufferIfNeeded()
return i.ui.dumpScreenshot(i.mipmap, name, blackbg)
}
func (i *Image) flushBufferIfNeeded() {
// The buffers are exclusive and the order should not matter.
i.flushDotsBufferIfNeeded()
i.flushBigOffscreenBufferIfNeeded()
}
func (i *Image) flushDotsBufferIfNeeded() {
if len(i.dotsBuffer) == 0 {
return
}
l := len(i.dotsBuffer)
vs := make([]float32, l*4*graphics.VertexFloatCount)
is := make([]uint16, l*6)
sx, sy := float32(1), float32(1)
var idx int
for p, c := range i.dotsBuffer {
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dx := float32(p.X)
dy := float32(p.Y)
crf := float32(c[0]) / 0xff
cgf := float32(c[1]) / 0xff
cbf := float32(c[2]) / 0xff
caf := float32(c[3]) / 0xff
vs[graphics.VertexFloatCount*4*idx] = dx
vs[graphics.VertexFloatCount*4*idx+1] = dy
vs[graphics.VertexFloatCount*4*idx+2] = sx
vs[graphics.VertexFloatCount*4*idx+3] = sy
vs[graphics.VertexFloatCount*4*idx+4] = crf
vs[graphics.VertexFloatCount*4*idx+5] = cgf
vs[graphics.VertexFloatCount*4*idx+6] = cbf
vs[graphics.VertexFloatCount*4*idx+7] = caf
vs[graphics.VertexFloatCount*4*idx+8] = dx + 1
vs[graphics.VertexFloatCount*4*idx+9] = dy
vs[graphics.VertexFloatCount*4*idx+10] = sx + 1
vs[graphics.VertexFloatCount*4*idx+11] = sy
vs[graphics.VertexFloatCount*4*idx+12] = crf
vs[graphics.VertexFloatCount*4*idx+13] = cgf
vs[graphics.VertexFloatCount*4*idx+14] = cbf
vs[graphics.VertexFloatCount*4*idx+15] = caf
vs[graphics.VertexFloatCount*4*idx+16] = dx
vs[graphics.VertexFloatCount*4*idx+17] = dy + 1
vs[graphics.VertexFloatCount*4*idx+18] = sx
vs[graphics.VertexFloatCount*4*idx+19] = sy + 1
vs[graphics.VertexFloatCount*4*idx+20] = crf
vs[graphics.VertexFloatCount*4*idx+21] = cgf
vs[graphics.VertexFloatCount*4*idx+22] = cbf
vs[graphics.VertexFloatCount*4*idx+23] = caf
vs[graphics.VertexFloatCount*4*idx+24] = dx + 1
vs[graphics.VertexFloatCount*4*idx+25] = dy + 1
vs[graphics.VertexFloatCount*4*idx+26] = sx + 1
vs[graphics.VertexFloatCount*4*idx+27] = sy + 1
vs[graphics.VertexFloatCount*4*idx+28] = crf
vs[graphics.VertexFloatCount*4*idx+29] = cgf
vs[graphics.VertexFloatCount*4*idx+30] = cbf
vs[graphics.VertexFloatCount*4*idx+31] = caf
is[6*idx] = uint16(4 * idx)
is[6*idx+1] = uint16(4*idx + 1)
is[6*idx+2] = uint16(4*idx + 2)
is[6*idx+3] = uint16(4*idx + 1)
is[6*idx+4] = uint16(4*idx + 2)
is[6*idx+5] = uint16(4*idx + 3)
idx++
}
i.dotsBuffer = nil
srcs := [graphics.ShaderImageCount]*mipmap.Mipmap{i.ui.whiteImage.mipmap}
dr := image.Rect(0, 0, i.width, i.height)
blend := graphicsdriver.BlendCopy
i.lastBlend = blend
i.mipmap.DrawTriangles(srcs, vs, is, blend, dr, [graphics.ShaderImageCount]image.Rectangle{}, NearestFilterShader.shader, nil, false, true)
}
func (i *Image) flushBigOffscreenBufferIfNeeded() {
if i.bigOffscreenBuffer != nil {
i.bigOffscreenBuffer.flush()
}
}
func (u *UserInterface) DumpImages(dir string) (string, error) {
return u.dumpImages(dir)
}
func (i *Image) clear() {
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i.Fill(0, 0, 0, 0, image.Rect(0, 0, i.width, i.height))
}
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func (i *Image) Fill(r, g, b, a float32, region image.Rectangle) {
if len(i.tmpVerticesForFill) < 4*graphics.VertexFloatCount {
i.tmpVerticesForFill = make([]float32, 4*graphics.VertexFloatCount)
}
// i.tmpVerticesForFill can be reused as this is sent to DrawTriangles immediately.
graphics.QuadVertices(
i.tmpVerticesForFill,
1, 1, float32(i.ui.whiteImage.width-1), float32(i.ui.whiteImage.height-1),
float32(i.width), 0, 0, float32(i.height), 0, 0,
r, g, b, a)
is := graphics.QuadIndices()
srcs := [graphics.ShaderImageCount]*Image{i.ui.whiteImage}
blend := graphicsdriver.BlendCopy
// If possible, use BlendSourceOver to encourage batching (#2817).
if a == 1 && i.lastBlend == graphicsdriver.BlendSourceOver {
blend = graphicsdriver.BlendSourceOver
}
// i.lastBlend is updated in DrawTriangles.
i.DrawTriangles(srcs, i.tmpVerticesForFill, is, blend, region, [graphics.ShaderImageCount]image.Rectangle{}, NearestFilterShader, nil, false, true, false)
}
type bigOffscreenImage struct {
ui *UserInterface
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orig *Image
imageType atlas.ImageType
image *Image
region image.Rectangle
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blend graphicsdriver.Blend
dirty bool
tmpVerticesForFlushing []float32
tmpVerticesForCopying []float32
}
func (u *UserInterface) newBigOffscreenImage(orig *Image, imageType atlas.ImageType) *bigOffscreenImage {
return &bigOffscreenImage{
ui: u,
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orig: orig,
imageType: imageType,
}
}
func (i *bigOffscreenImage) markDisposed() {
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if i.image != nil {
i.image.MarkDisposed()
i.image = nil
}
i.dirty = false
}
func (i *bigOffscreenImage) drawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices []float32, indices []uint16, blend graphicsdriver.Blend, dstRegion image.Rectangle, srcRegions [graphics.ShaderImageCount]image.Rectangle, shader *Shader, uniforms []uint32, evenOdd bool, canSkipMipmap bool, antialias bool) {
if i.blend != blend {
i.flush()
}
i.blend = blend
// If the new region doesn't match with the current region, remove the buffer image and recreate it later.
if r := i.requiredRegion(vertices); i.region != r {
i.flush()
i.image = nil
i.region = r
}
if i.region.Empty() {
return
}
if i.image == nil {
i.image = i.ui.NewImage(i.region.Dx()*bigOffscreenScale, i.region.Dy()*bigOffscreenScale, i.imageType)
}
// Copy the current rendering result to get the correct blending result.
if blend != graphicsdriver.BlendSourceOver && !i.dirty {
srcs := [graphics.ShaderImageCount]*Image{i.orig}
if len(i.tmpVerticesForCopying) < 4*graphics.VertexFloatCount {
i.tmpVerticesForCopying = make([]float32, 4*graphics.VertexFloatCount)
}
// i.tmpVerticesForCopying can be resused as this is sent to DrawTriangles immediately.
graphics.QuadVertices(
i.tmpVerticesForCopying,
float32(i.region.Min.X), float32(i.region.Min.Y), float32(i.region.Max.X), float32(i.region.Max.Y),
bigOffscreenScale, 0, 0, bigOffscreenScale, 0, 0,
1, 1, 1, 1)
is := graphics.QuadIndices()
dstRegion := image.Rect(0, 0, i.region.Dx()*bigOffscreenScale, i.region.Dy()*bigOffscreenScale)
i.image.DrawTriangles(srcs, i.tmpVerticesForCopying, is, graphicsdriver.BlendCopy, dstRegion, [graphics.ShaderImageCount]image.Rectangle{}, NearestFilterShader, nil, false, true, false)
}
for idx := 0; idx < len(vertices); idx += graphics.VertexFloatCount {
vertices[idx] = (vertices[idx] - float32(i.region.Min.X)) * bigOffscreenScale
vertices[idx+1] = (vertices[idx+1] - float32(i.region.Min.Y)) * bigOffscreenScale
}
// Translate to i.region coordinate space, and clamp against region size.
dstRegion = dstRegion.Sub(i.region.Min)
dstRegion = dstRegion.Intersect(image.Rect(0, 0, i.region.Dx(), i.region.Dy()))
dstRegion.Min.X *= bigOffscreenScale
dstRegion.Min.Y *= bigOffscreenScale
dstRegion.Max.X *= bigOffscreenScale
dstRegion.Max.Y *= bigOffscreenScale
i.image.DrawTriangles(srcs, vertices, indices, blend, dstRegion, srcRegions, shader, uniforms, evenOdd, canSkipMipmap, false)
i.dirty = true
}
func (i *bigOffscreenImage) flush() {
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if i.image == nil {
return
}
if !i.dirty {
return
}
// Mark the offscreen clearn earlier to avoid recursive calls.
i.dirty = false
srcs := [graphics.ShaderImageCount]*Image{i.image}
if len(i.tmpVerticesForFlushing) < 4*graphics.VertexFloatCount {
i.tmpVerticesForFlushing = make([]float32, 4*graphics.VertexFloatCount)
}
// i.tmpVerticesForFlushing can be reused as this is sent to DrawTriangles in this function.
graphics.QuadVertices(
i.tmpVerticesForFlushing,
0, 0, float32(i.region.Dx()*bigOffscreenScale), float32(i.region.Dy()*bigOffscreenScale),
1.0/bigOffscreenScale, 0, 0, 1.0/bigOffscreenScale, float32(i.region.Min.X), float32(i.region.Min.Y),
1, 1, 1, 1)
is := graphics.QuadIndices()
dstRegion := i.region
blend := graphicsdriver.BlendSourceOver
if i.blend != graphicsdriver.BlendSourceOver {
blend = graphicsdriver.BlendCopy
}
i.orig.DrawTriangles(srcs, i.tmpVerticesForFlushing, is, blend, dstRegion, [graphics.ShaderImageCount]image.Rectangle{}, LinearFilterShader, nil, false, true, false)
i.image.clear()
i.dirty = false
}
func (i *bigOffscreenImage) requiredRegion(vertices []float32) image.Rectangle {
minX := float32(i.orig.width)
minY := float32(i.orig.height)
maxX := float32(0)
maxY := float32(0)
for i := 0; i < len(vertices); i += graphics.VertexFloatCount {
dstX := vertices[i]
dstY := vertices[i+1]
if minX > floor(dstX)-1 {
minX = floor(dstX) - 1
}
if minY > floor(dstY)-1 {
minY = floor(dstY) - 1
}
if maxX < ceil(dstX)+1 {
maxX = ceil(dstX) + 1
}
if maxY < ceil(dstY)+1 {
maxY = ceil(dstY) + 1
}
}
// Adjust the granularity of the rectangle.
r := image.Rect(
roundDown16(int(minX)),
roundDown16(int(minY)),
roundUp16(int(maxX)),
roundUp16(int(maxY)))
r = r.Intersect(image.Rect(0, 0, i.orig.width, i.orig.height))
// TODO: Is this check required?
if r.Dx() < 0 || r.Dy() < 0 {
return i.region
}
return r.Union(i.region)
}
func floor(x float32) float32 {
return float32(math.Floor(float64(x)))
}
func ceil(x float32) float32 {
return float32(math.Ceil(float64(x)))
}
func roundDown16(x int) int {
return x & ^(0xf)
}
func roundUp16(x int) int {
return ((x - 1) & ^(0xf)) + 0x10
}