mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
143 lines
4.0 KiB
Go
143 lines
4.0 KiB
Go
// Copyright 2022 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ui
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import (
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"github.com/hajimehoshi/ebiten/v2/internal/affine"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
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)
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// panicOnErrorOnReadingPixels indicates whether reading pixels panics on an error or not.
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// This value is set only on testing.
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var panicOnErrorOnReadingPixels bool
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func SetPanicOnErrorOnReadingPixelsForTesting(value bool) {
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panicOnErrorOnReadingPixels = value
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}
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type Image struct {
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mipmap *mipmap.Mipmap
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width int
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height int
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}
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func NewImage(width, height int) *Image {
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return &Image{
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mipmap: mipmap.New(width, height),
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width: width,
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height: height,
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}
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}
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func newScreenFramebufferImage(width, height int) *Image {
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return &Image{
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mipmap: mipmap.NewScreenFramebufferMipmap(width, height),
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width: width,
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height: height,
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}
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}
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func (i *Image) MarkDisposed() {
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if i.mipmap == nil {
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return
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}
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i.mipmap.MarkDisposed()
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i.mipmap = nil
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}
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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][]float32, evenOdd bool, canSkipMipmap bool) {
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var srcMipmaps [graphics.ShaderImageNum]*mipmap.Mipmap
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for i, src := range srcs {
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if src == nil {
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continue
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}
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srcMipmaps[i] = src.mipmap
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}
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var s *mipmap.Shader
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if shader != nil {
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s = shader.shader
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}
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i.mipmap.DrawTriangles(srcMipmaps, vertices, indices, colorm, mode, filter, address, dstRegion, srcRegion, subimageOffsets, s, uniforms, evenOdd, canSkipMipmap)
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}
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func (i *Image) ReplacePixels(pix []byte, x, y, width, height int) {
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i.mipmap.ReplacePixels(pix, x, y, width, height)
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}
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func (i *Image) At(x, y int) (r, g, b, a byte) {
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// Check the error existence and avoid unnecessary calls.
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if theGlobalState.error() != nil {
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return 0, 0, 0, 0
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}
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r, g, b, a, err := theUI.imageAt(i.mipmap, x, y)
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if err != nil {
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if panicOnErrorOnReadingPixels {
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panic(err)
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}
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theGlobalState.setError(err)
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return 0, 0, 0, 0
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}
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return r, g, b, a
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}
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func (i *Image) DumpScreenshot(name string, blackbg bool) error {
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return theUI.dumpScreenshot(i.mipmap, name, blackbg)
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}
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func DumpImages(dir string) error {
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return theUI.dumpImages(dir)
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}
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var (
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emptyImage = NewImage(3, 3)
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)
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func init() {
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pix := make([]byte, 4*emptyImage.width*emptyImage.height)
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for i := range pix {
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pix[i] = 0xff
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}
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// As emptyImage is used at Fill, use ReplacePixels instead.
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emptyImage.ReplacePixels(pix, 0, 0, emptyImage.width, emptyImage.height)
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}
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func (i *Image) clear() {
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i.Fill(0, 0, 0, 0, 0, 0, i.width, i.height)
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}
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func (i *Image) Fill(r, g, b, a float32, x, y, width, height int) {
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dstRegion := graphicsdriver.Region{
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X: float32(x),
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Y: float32(y),
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Width: float32(width),
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Height: float32(height),
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}
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vs := graphics.QuadVertices(
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1, 1, float32(emptyImage.width-1), float32(emptyImage.height-1),
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float32(i.width), 0, 0, float32(i.height), 0, 0,
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r, g, b, a)
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is := graphics.QuadIndices()
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srcs := [graphics.ShaderImageNum]*Image{emptyImage}
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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)
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}
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