mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 12:18:55 +01:00
310 lines
7.8 KiB
Go
310 lines
7.8 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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"image/color"
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"github.com/hajimehoshi/ebiten/internal/affine"
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"github.com/hajimehoshi/ebiten/internal/driver"
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"github.com/hajimehoshi/ebiten/internal/mipmap"
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)
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type Image struct {
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img *mipmap.Mipmap
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width int
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height int
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hasFill bool
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fillColor color.RGBA
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pixels []byte
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needsToResolvePixels bool
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}
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func BeginFrame() error {
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if err := mipmap.BeginFrame(); err != nil {
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return err
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}
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return flushDelayedCommands()
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}
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func EndFrame() error {
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return mipmap.EndFrame()
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}
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func NewImage(width, height int, volatile bool) *Image {
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i := &Image{}
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i.initialize(width, height, volatile)
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return i
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}
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func (i *Image) initialize(width, height int, volatile bool) {
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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delayedCommands = append(delayedCommands, func() error {
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i.initialize(width, height, volatile)
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return nil
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})
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return
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}
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i.img = mipmap.New(width, height, volatile)
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i.width = width
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i.height = height
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}
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func NewScreenFramebufferImage(width, height int) *Image {
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i := &Image{}
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i.initializeAsScreenFramebuffer(width, height)
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return i
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}
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func (i *Image) initializeAsScreenFramebuffer(width, height int) {
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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delayedCommands = append(delayedCommands, func() error {
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i.initializeAsScreenFramebuffer(width, height)
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return nil
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})
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return
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}
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i.img = mipmap.NewScreenFramebufferMipmap(width, height)
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i.width = width
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i.height = height
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}
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func (i *Image) invalidatePendingPixels() {
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i.pixels = nil
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i.needsToResolvePixels = false
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i.hasFill = false
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}
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func (i *Image) resolvePendingPixels(keepPendingPixels bool) {
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if i.needsToResolvePixels && i.hasFill {
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panic("buffered: needsToResolvePixels and hasFill must not be true at the same time")
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}
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if i.needsToResolvePixels {
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i.img.ReplacePixels(i.pixels)
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if !keepPendingPixels {
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i.pixels = nil
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}
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i.needsToResolvePixels = false
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}
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i.resolvePendingFill()
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}
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func (i *Image) resolvePendingFill() {
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if !i.hasFill {
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return
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}
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i.img.Fill(i.fillColor)
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i.hasFill = false
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}
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func (i *Image) MarkDisposed() {
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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delayedCommands = append(delayedCommands, func() error {
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i.MarkDisposed()
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return nil
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})
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return
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}
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i.invalidatePendingPixels()
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i.img.MarkDisposed()
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}
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func (i *Image) At(x, y int) (r, g, b, a byte, err error) {
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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panic("buffered: the command queue is not available yet at At")
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}
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if x < 0 || y < 0 || x >= i.width || y >= i.height {
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return 0, 0, 0, 0, nil
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}
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// If there are pixels or pending fillling that needs to be resolved, use this rather than resolving.
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// Resolving them needs to access GPU and is expensive (#1137).
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if i.hasFill {
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return i.fillColor.R, i.fillColor.G, i.fillColor.B, i.fillColor.A, nil
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}
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if i.pixels == nil {
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pix, err := i.img.Pixels(0, 0, i.width, i.height)
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if err != nil {
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return 0, 0, 0, 0, err
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}
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i.pixels = pix
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}
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idx := i.width*y + x
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return i.pixels[4*idx], i.pixels[4*idx+1], i.pixels[4*idx+2], i.pixels[4*idx+3], nil
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}
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func (i *Image) Dump(name string, blackbg bool) error {
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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panic("buffered: the command queue is not available yet at Dump")
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}
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return i.img.Dump(name, blackbg)
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}
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func (i *Image) Fill(clr color.RGBA) {
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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delayedCommands = append(delayedCommands, func() error {
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i.Fill(clr)
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return nil
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})
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return
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}
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// Defer filling the image so that successive fillings will be merged into one (#1134).
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i.invalidatePendingPixels()
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i.fillColor = clr
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i.hasFill = true
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}
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func (i *Image) ReplacePixels(pix []byte, x, y, width, height int) error {
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if l := 4 * width * height; 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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// This is an optimization to avoid mutex for the case when ReplacePixels is called very often (e.g., Set).
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// If i.pixels is not nil, delayed commands have already been flushed.
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// needsToDelayCommands should be false, but we don't check it because this is out of the mutex lock.
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// (#1137)
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if i.pixels != nil {
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// If the region is the whole image, don't use this optimization, or more memory is consumed by
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// keeping pixels.
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if !(x == 0 && y == 0 && width == i.width && height == i.height) {
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i.replacePendingPixels(pix, x, y, width, height)
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return nil
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}
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}
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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copied := make([]byte, len(pix))
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copy(copied, pix)
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delayedCommands = append(delayedCommands, func() error {
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i.ReplacePixels(copied, x, y, width, height)
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return nil
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})
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return nil
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}
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i.resolvePendingFill()
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if x == 0 && y == 0 && width == i.width && height == i.height {
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i.invalidatePendingPixels()
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i.img.ReplacePixels(pix)
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return nil
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}
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// TODO: Can we use (*restorable.Image).ReplacePixels?
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if i.pixels == nil {
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pix, err := i.img.Pixels(0, 0, i.width, i.height)
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if 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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i.replacePendingPixels(pix, x, y, width, height)
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return nil
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}
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func (i *Image) replacePendingPixels(pix []byte, x, y, width, height int) {
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for j := 0; j < height; j++ {
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copy(i.pixels[4*((j+y)*i.width+x):], pix[4*j*width:4*(j+1)*width])
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}
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i.needsToResolvePixels = true
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}
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func (i *Image) DrawImage(src *Image, bounds image.Rectangle, a, b, c, d, tx, ty float32, colorm *affine.ColorM, mode driver.CompositeMode, filter driver.Filter) {
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if i == src {
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panic("buffered: Image.DrawImage: src must be different from the receiver")
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}
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g := mipmap.GeoM{
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A: a,
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B: b,
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C: c,
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D: d,
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Tx: tx,
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Ty: ty,
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}
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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delayedCommands = append(delayedCommands, func() error {
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i.drawImage(src, bounds, g, colorm, mode, filter)
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return nil
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})
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return
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}
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i.drawImage(src, bounds, g, colorm, mode, filter)
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}
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func (i *Image) drawImage(src *Image, bounds image.Rectangle, g mipmap.GeoM, colorm *affine.ColorM, mode driver.CompositeMode, filter driver.Filter) {
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src.resolvePendingPixels(true)
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i.resolvePendingPixels(false)
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i.img.DrawImage(src.img, bounds, g, colorm, mode, filter)
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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(src *Image, vertices []float32, indices []uint16, colorm *affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address) {
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if i == src {
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panic("buffered: Image.DrawTriangles: src must be different from the receiver")
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}
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delayedCommandsM.Lock()
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defer delayedCommandsM.Unlock()
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if needsToDelayCommands {
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delayedCommands = append(delayedCommands, func() error {
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// Arguments are not copied. Copying is the caller's responsibility.
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i.DrawTriangles(src, vertices, indices, colorm, mode, filter, address)
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return nil
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})
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return
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}
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src.resolvePendingPixels(true)
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i.resolvePendingPixels(false)
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i.img.DrawTriangles(src.img, vertices, indices, colorm, mode, filter, address)
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}
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