mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
95 lines
3.4 KiB
Go
95 lines
3.4 KiB
Go
// Copyright 2016 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 restorable
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import (
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"image"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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)
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// Image represents an image.
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type Image struct {
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// Image is the underlying image.
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// This member is exported on purpose.
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// TODO: Move the implementation to internal/atlas package (#805).
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Image *graphicscommand.Image
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width int
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height int
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}
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// NewImage creates an emtpy image with the given size.
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//
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// The returned image is cleared.
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//
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// Note that Dispose is not called automatically.
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func NewImage(width, height int, screen bool) *Image {
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i := &Image{
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Image: graphicscommand.NewImage(width, height, screen),
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width: width,
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height: height,
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}
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// This needs to use 'InternalSize' to render the whole region, or edges are unexpectedly cleared on some
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// devices.
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iw, ih := i.Image.InternalSize()
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clearImage(i.Image, image.Rect(0, 0, iw, ih))
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return i
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}
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// Extend extends the image by the given size.
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// Extend creates a new image with the given size and copies the pixels of the given source image.
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// Extend disposes itself after its call.
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func (i *Image) Extend(width, height int) *Image {
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if i.width >= width && i.height >= height {
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return i
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}
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// Assume that the screen image is never extended.
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newImg := NewImage(width, height, false)
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// Use DrawTriangles instead of WritePixels because the image i might be stale and not have its pixels
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// information.
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srcs := [graphics.ShaderSrcImageCount]*graphicscommand.Image{i.Image}
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sw, sh := i.Image.InternalSize()
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vs := make([]float32, 4*graphics.VertexFloatCount)
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graphics.QuadVerticesFromDstAndSrc(vs, 0, 0, float32(sw), float32(sh), 0, 0, float32(sw), float32(sh), 1, 1, 1, 1)
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is := graphics.QuadIndices()
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dr := image.Rect(0, 0, sw, sh)
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newImg.Image.DrawTriangles(srcs, vs, is, graphicsdriver.BlendCopy, dr, [graphics.ShaderSrcImageCount]image.Rectangle{}, NearestFilterShader.Shader, nil, graphicsdriver.FillRuleFillAll)
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i.Image.Dispose()
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i.Image = nil
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return newImg
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}
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func clearImage(i *graphicscommand.Image, region image.Rectangle) {
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vs := make([]float32, 4*graphics.VertexFloatCount)
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graphics.QuadVerticesFromDstAndSrc(vs, float32(region.Min.X), float32(region.Min.Y), float32(region.Max.X), float32(region.Max.Y), 0, 0, 0, 0, 0, 0, 0, 0)
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is := graphics.QuadIndices()
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i.DrawTriangles([graphics.ShaderSrcImageCount]*graphicscommand.Image{}, vs, is, graphicsdriver.BlendClear, region, [graphics.ShaderSrcImageCount]image.Rectangle{}, clearShader.Shader, nil, graphicsdriver.FillRuleFillAll)
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}
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// ClearPixels clears the specified region by WritePixels.
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func (i *Image) ClearPixels(region image.Rectangle) {
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if region.Dx() <= 0 || region.Dy() <= 0 {
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panic("restorable: width/height must be positive")
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}
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clearImage(i.Image, region.Intersect(image.Rect(0, 0, i.width, i.height)))
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}
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