mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-24 18:58:54 +01:00
167 lines
4.5 KiB
Go
167 lines
4.5 KiB
Go
// Copyright 2014 Hajime Hoshi
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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 ebiten
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import (
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"errors"
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"github.com/hajimehoshi/ebiten/internal"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/ui"
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"image"
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"image/color"
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)
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// Image represents an image.
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// The pixel format is alpha-premultiplied.
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// Image implements image.Image.
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type Image struct {
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framebuffer *graphics.Framebuffer
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texture *graphics.Texture
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pixels []uint8
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}
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// Size returns the size of the image.
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func (i *Image) Size() (width, height int) {
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return i.framebuffer.Size()
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}
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// Clear resets the pixels of the image into 0.
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func (i *Image) Clear() (err error) {
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return i.Fill(color.Transparent)
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}
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// Fill fills the image with a solid color.
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func (i *Image) Fill(clr color.Color) (err error) {
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i.pixels = nil
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r, g, b, a := internal.RGBA(clr)
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ui.Use(func(c *opengl.Context) {
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err = i.framebuffer.Fill(c, r, g, b, a)
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})
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return
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}
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// DrawImage draws the given image on the receiver image.
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//
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// This method accepts the options.
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// The parts of the given image at the parts of the destination.
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// After determining parts to draw, this applies the geometry matrix and the color matrix.
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//
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// Here are the default values:
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// ImageParts: (0, 0) - (source width, source height) to (0, 0) - (source width, source height)
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// (i.e. the whole source image)
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// GeoM: Identity matrix
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// ColorM: Identity matrix (that changes no colors)
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//
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// Be careful that this method is potentially slow.
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// It would be better if you could call this method fewer times.
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func (i *Image) DrawImage(image *Image, options *DrawImageOptions) (err error) {
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if i == image {
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return errors.New("Image.DrawImage: image should be different from the receiver")
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}
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i.pixels = nil
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if options == nil {
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options = &DrawImageOptions{}
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}
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parts := options.ImageParts
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if parts == nil {
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// Check options.Parts for backward-compatibility.
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dparts := options.Parts
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if dparts != nil {
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parts = imageParts(dparts)
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} else {
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w, h := image.Size()
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parts = &wholeImage{w, h}
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}
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}
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w, h := image.Size()
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quads := &textureQuads{parts: parts, width: w, height: h}
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ui.Use(func(c *opengl.Context) {
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err = i.framebuffer.DrawTexture(c, image.texture, quads, &options.GeoM, &options.ColorM)
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})
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return
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}
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// A Rects represents the set of rectangles.
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type Rects interface {
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Len() int
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Points(i int) (x0, y0, x1, y1 int)
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}
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type rectVertexQuads struct {
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Rects
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}
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func (l rectVertexQuads) Len() int {
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return l.Rects.Len()
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}
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func (l rectVertexQuads) Vertex(i int) (x0, y0, x1, y1 float32) {
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ix0, iy0, ix1, iy1 := l.Rects.Points(i)
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return float32(ix0), float32(iy0), float32(ix1), float32(iy1)
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}
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// DrawRects draws rectangles on the image.
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//
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// NOTE: This method is experimental.
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func (i *Image) DrawRects(clr color.Color, rects Rects) (err error) {
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r, g, b, a := internal.RGBA(clr)
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ui.Use(func(c *opengl.Context) {
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err = i.framebuffer.DrawRects(c, r, g, b, a, &rectVertexQuads{rects})
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})
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return
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}
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// Bounds returns the bounds of the image.
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func (i *Image) Bounds() image.Rectangle {
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w, h := i.Size()
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return image.Rect(0, 0, w, h)
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}
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// ColorModel returns the color model of the image.
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func (i *Image) ColorModel() color.Model {
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return color.RGBAModel
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}
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// At returns the color of the image at (x, y).
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//
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// This method loads pixels from VRAM to system memory if necessary.
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func (i *Image) At(x, y int) color.Color {
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if i.pixels == nil {
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ui.Use(func(c *opengl.Context) {
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var err error
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i.pixels, err = i.texture.Pixels(c)
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if err != nil {
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panic(err)
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}
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})
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}
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w, _ := i.Size()
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w = internal.NextPowerOf2Int(w)
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idx := 4*x + 4*y*w
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r, g, b, a := i.pixels[idx], i.pixels[idx+1], i.pixels[idx+2], i.pixels[idx+3]
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return color.RGBA{r, g, b, a}
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}
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// A DrawImageOptions represents options to render an image on an image.
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type DrawImageOptions struct {
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ImageParts ImageParts
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GeoM GeoM
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ColorM ColorM
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// Deprecated (as of 1.1.0-alpha): Use ImageParts instead.
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Parts []ImagePart
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}
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