twitchapon-anim

image.go (6980B)

---

 // Copyright 2016 Hajime Hoshi
 //
 // 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 graphicscommand
 
 import (
 	"fmt"
 	"image"
 	"os"
 	"strings"
 
 	"github.com/hajimehoshi/ebiten/v2/internal/affine"
 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
 	"github.com/hajimehoshi/ebiten/v2/internal/png"
 )
 
 type lastCommand int
 
 const (
 	lastCommandNone lastCommand = iota
 	lastCommandClear
 	lastCommandDrawTriangles
 	lastCommandReplacePixels
 )
 
 // Image represents an image that is implemented with OpenGL.
 type Image struct {
 	image          driver.Image
 	width          int
 	height         int
 	internalWidth  int
 	internalHeight int
 	screen         bool
 
 	// id is an indentifier for the image. This is used only when dummping the information.
 	//
 	// This is duplicated with driver.Image's ID, but this id is still necessary because this image might not
 	// have its driver.Image.
 	id int
 
 	bufferedRP []*driver.ReplacePixelsArgs
 
 	lastCommand lastCommand
 }
 
 var nextID = 1
 
 func genNextID() int {
 	id := nextID
 	nextID++
 	return id
 }
 
 // NewImage returns a new image.
 //
 // Note that the image is not initialized yet.
 func NewImage(width, height int) *Image {
 	i := &Image{
 		width:  width,
 		height: height,
 		id:     genNextID(),
 	}
 	c := &newImageCommand{
 		result: i,
 		width:  width,
 		height: height,
 	}
 	theCommandQueue.Enqueue(c)
 	return i
 }
 
 func NewScreenFramebufferImage(width, height int) *Image {
 	i := &Image{
 		width:  width,
 		height: height,
 		screen: true,
 		id:     genNextID(),
 	}
 	c := &newScreenFramebufferImageCommand{
 		result: i,
 		width:  width,
 		height: height,
 	}
 	theCommandQueue.Enqueue(c)
 	return i
 }
 
 func (i *Image) resolveBufferedReplacePixels() {
 	if len(i.bufferedRP) == 0 {
 		return
 	}
 	c := &replacePixelsCommand{
 		dst:  i,
 		args: i.bufferedRP,
 	}
 	theCommandQueue.Enqueue(c)
 	i.bufferedRP = nil
 }
 
 func (i *Image) Dispose() {
 	c := &disposeImageCommand{
 		target: i,
 	}
 	theCommandQueue.Enqueue(c)
 }
 
 func (i *Image) InternalSize() (int, int) {
 	if i.screen {
 		return i.width, i.height
 	}
 	if i.internalWidth == 0 {
 		i.internalWidth = graphics.InternalImageSize(i.width)
 	}
 	if i.internalHeight == 0 {
 		i.internalHeight = graphics.InternalImageSize(i.height)
 	}
 	return i.internalWidth, i.internalHeight
 }
 
 // DrawTriangles draws triangles with the given image.
 //
 // The vertex floats are:
 //
 //   0: Destination X in pixels
 //   1: Destination Y in pixels
 //   2: Source X in pixels (not texels!)
 //   3: Source Y in pixels
 //   4: Color R [0.0-1.0]
 //   5: Color G
 //   6: Color B
 //   7: Color Y
 //
 // src and shader are exclusive and only either is non-nil.
 //
 // The elements that index is in between 2 and 7 are used for the source images.
 // The source image is 1) src argument if non-nil, or 2) an image value in the uniform variables if it exists.
 // If there are multiple images in the uniform variables, the smallest ID's value is adopted.
 //
 // If the source image is not specified, i.e., src is nil and there is no image in the uniform variables, the
 // elements for the source image are not used.
 func (i *Image) DrawTriangles(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, clr *affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, sourceRegion driver.Region, shader *Shader, uniforms []interface{}) {
 	if i.lastCommand == lastCommandNone {
 		if !i.screen && mode != driver.CompositeModeClear {
 			panic("graphicscommand: the image must be cleared first")
 		}
 	}
 
 	if shader == nil {
 		// Fast path for rendering without a shader (#1355).
 		img := srcs[0]
 		if img.screen {
 			panic("graphicscommand: the screen image cannot be the rendering source")
 		}
 		img.resolveBufferedReplacePixels()
 	} else {
 		for _, src := range srcs {
 			if src == nil {
 				continue
 			}
 			if src.screen {
 				panic("graphicscommand: the screen image cannot be the rendering source")
 			}
 			src.resolveBufferedReplacePixels()
 		}
 	}
 	i.resolveBufferedReplacePixels()
 
 	theCommandQueue.EnqueueDrawTrianglesCommand(i, srcs, offsets, vertices, indices, clr, mode, filter, address, sourceRegion, shader, uniforms)
 
 	if i.lastCommand == lastCommandNone && !i.screen {
 		i.lastCommand = lastCommandClear
 	} else {
 		i.lastCommand = lastCommandDrawTriangles
 	}
 }
 
 // Pixels returns the image's pixels.
 // Pixels might return nil when OpenGL error happens.
 func (i *Image) Pixels() ([]byte, error) {
 	i.resolveBufferedReplacePixels()
 	c := &pixelsCommand{
 		result: nil,
 		img:    i,
 	}
 	theCommandQueue.Enqueue(c)
 	if err := theCommandQueue.Flush(); err != nil {
 		return nil, err
 	}
 	return c.result, nil
 }
 
 func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
 	// ReplacePixels for a part might invalidate the current image that are drawn by DrawTriangles (#593, #738).
 	if i.lastCommand == lastCommandDrawTriangles {
 		if x != 0 || y != 0 || i.width != width || i.height != height {
 			panic("graphicscommand: ReplacePixels for a part after DrawTriangles is forbidden")
 		}
 	}
 	i.bufferedRP = append(i.bufferedRP, &driver.ReplacePixelsArgs{
 		Pixels: pixels,
 		X:      x,
 		Y:      y,
 		Width:  width,
 		Height: height,
 	})
 	i.lastCommand = lastCommandReplacePixels
 }
 
 func (i *Image) IsInvalidated() bool {
 	if i.screen {
 		// The screen image might not have a texture, and in this case it is impossible to detect whether
 		// the image is invalidated or not.
 		panic("graphicscommand: IsInvalidated cannot be called on the screen image")
 	}
 
 	// i.image can be nil before initializing.
 	if i.image == nil {
 		return false
 	}
 	return i.image.IsInvalidated()
 }
 
 // Dump dumps the image to the specified path.
 // In the path, '*' is replaced with the image's ID.
 //
 // If blackbg is true, any alpha values in the dumped image will be 255.
 //
 // This is for testing usage.
 func (i *Image) Dump(path string, blackbg bool) error {
 	// Screen image cannot be dumped.
 	if i.screen {
 		return nil
 	}
 
 	path = strings.ReplaceAll(path, "*", fmt.Sprintf("%d", i.id))
 	f, err := os.Create(path)
 	if err != nil {
 		return err
 	}
 	defer f.Close()
 
 	pix, err := i.Pixels()
 	if err != nil {
 		return err
 	}
 
 	if blackbg {
 		for i := 0; i < len(pix)/4; i++ {
 			pix[4*i+3] = 0xff
 		}
 	}
 
 	if err := png.Encode(f, &image.RGBA{
 		Pix:    pix,
 		Stride: 4 * i.width,
 		Rect:   image.Rect(0, 0, i.width, i.height),
 	}); err != nil {
 		return err
 	}
 	return nil
 }