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 (
"github.com/hajimehoshi/ebiten/v2/internal/affine"
"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
}
type Image struct {
mipmap *mipmap.Mipmap
width int
height int
}
func NewImage(width, height int) *Image {
return &Image{
mipmap: mipmap.New(width, height),
width: width,
height: height,
}
}
func newScreenFramebufferImage(width, height int) *Image {
return &Image{
mipmap: mipmap.NewScreenFramebufferMipmap(width, height),
width: width,
height: height,
}
}
func (i *Image) MarkDisposed() {
i.mipmap.MarkDisposed()
i.mipmap = nil
}
func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, vertices []float32, indices []uint16, colorm affine.ColorM, mode graphicsdriver.CompositeMode, filter graphicsdriver.Filter, address graphicsdriver.Address, dstRegion, srcRegion graphicsdriver.Region, subimageOffsets [graphics.ShaderImageNum - 1][2]float32, shader *Shader, uniforms map[string]interface{}, evenOdd bool, canSkipMipmap bool) {
var srcMipmaps [graphics.ShaderImageNum]*mipmap.Mipmap
for i, src := range srcs {
if src == nil {
continue
}
srcMipmaps[i] = src.mipmap
}
var s *mipmap.Shader
if shader != nil {
s = shader.shader
}
i.mipmap.DrawTriangles(srcMipmaps, vertices, indices, colorm, mode, filter, address, dstRegion, srcRegion, subimageOffsets, s, uniforms, evenOdd, canSkipMipmap)
}
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func (i *Image) ReplacePixels(pix []byte, x, y, width, height int) {
i.mipmap.ReplacePixels(pix, x, y, width, height)
}
func (i *Image) At(x, y int) (r, g, b, a byte) {
// Check the error existence and avoid unnecessary calls.
if theGlobalState.error() != nil {
return 0, 0, 0, 0
}
r, g, b, a, err := theUI.imageAt(i.mipmap, x, y)
if err != nil {
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if panicOnErrorOnReadingPixels {
panic(err)
}
theGlobalState.setError(err)
return 0, 0, 0, 0
}
return r, g, b, a
}
func (i *Image) DumpScreenshot(name string, blackbg bool) error {
return theUI.dumpScreenshot(i.mipmap, name, blackbg)
}
func DumpImages(dir string) error {
return theUI.dumpImages(dir)
}
var (
emptyImage = NewImage(3, 3)
)
func init() {
pix := make([]byte, 4*emptyImage.width*emptyImage.height)
for i := range pix {
pix[i] = 0xff
}
// As emptyImage is used at Fill, use ReplacePixels instead.
emptyImage.ReplacePixels(pix, 0, 0, emptyImage.width, emptyImage.height)
}
func (i *Image) clear() {
i.Fill(0, 0, 0, 0, 0, 0, i.width, i.height)
}
func (i *Image) Fill(r, g, b, a float32, x, y, width, height int) {
dstRegion := graphicsdriver.Region{
X: float32(x),
Y: float32(y),
Width: float32(width),
Height: float32(height),
}
vs := graphics.QuadVertices(
1, 1, float32(emptyImage.width-1), float32(emptyImage.height-1),
float32(i.width), 0, 0, float32(i.height), 0, 0,
r, g, b, a)
is := graphics.QuadIndices()
srcs := [graphics.ShaderImageNum]*Image{emptyImage}
i.DrawTriangles(srcs, vs, is, affine.ColorMIdentity{}, graphicsdriver.CompositeModeCopy, graphicsdriver.FilterNearest, graphicsdriver.AddressUnsafe, dstRegion, graphicsdriver.Region{}, [graphics.ShaderImageNum - 1][2]float32{}, nil, nil, false, true)
}