mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
// Copyright 2019 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 buffered
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import (
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"fmt"
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"image"
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"github.com/hajimehoshi/ebiten/v2/internal/atlas"
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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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)
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type Image struct {
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img *atlas.Image
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width int
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height int
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// pixels is valid only when restorable.AlwaysReadPixelsFromGPU() returns true.
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pixels []byte
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}
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func NewImage(width, height int, imageType atlas.ImageType) *Image {
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return &Image{
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width: width,
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height: height,
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img: atlas.NewImage(width, height, imageType),
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}
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}
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func (i *Image) invalidatePixels() {
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i.pixels = nil
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}
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func (i *Image) Deallocate() {
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i.img.Deallocate()
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}
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func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) error {
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if i.pixels == nil {
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pix := make([]byte, 4*i.width*i.height)
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if err := i.img.ReadPixels(graphicsDriver, pix, image.Rect(0, 0, i.width, i.height)); err != nil {
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return err
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}
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i.pixels = pix
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}
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lineWidth := 4 * region.Dx()
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for j := 0; j < region.Dy(); j++ {
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dstX := 4 * j * region.Dx()
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srcX := 4 * ((region.Min.Y+j)*i.width + region.Min.X)
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copy(pixels[dstX:dstX+lineWidth], i.pixels[srcX:srcX+lineWidth])
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}
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return nil
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}
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func (i *Image) DumpScreenshot(graphicsDriver graphicsdriver.Graphics, name string, blackbg bool) (string, error) {
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return i.img.DumpScreenshot(graphicsDriver, name, blackbg)
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}
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// WritePixels replaces the pixels at the specified region.
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func (i *Image) WritePixels(pix []byte, region image.Rectangle) {
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if l := 4 * region.Dx() * region.Dy(); len(pix) != l {
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panic(fmt.Sprintf("buffered: len(pix) was %d but must be %d", len(pix), l))
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}
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i.invalidatePixels()
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i.img.WritePixels(pix, region)
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}
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// DrawTriangles draws the src image with the given vertices.
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//
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// Copying vertices and indices is the caller's responsibility.
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func (i *Image) DrawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices []float32, indices []uint32, blend graphicsdriver.Blend, dstRegion image.Rectangle, srcRegions [graphics.ShaderImageCount]image.Rectangle, shader *atlas.Shader, uniforms []uint32, fillRule graphicsdriver.FillRule) {
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for _, src := range srcs {
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if i == src {
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panic("buffered: Image.DrawTriangles: source images must be different from the receiver")
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}
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}
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i.invalidatePixels()
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var imgs [graphics.ShaderImageCount]*atlas.Image
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for i, img := range srcs {
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if img == nil {
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continue
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}
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imgs[i] = img.img
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}
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i.img.DrawTriangles(imgs, vertices, indices, blend, dstRegion, srcRegions, shader, uniforms, fillRule)
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}
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