Add DrawImage* functions (#40)

drawimage.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2014 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.
+*/
+
+// +build ignore
+
+package ebiten
+
+import (
+	"image"
+)
+
+func DrawImage(target *Image, img *Image, x, y int) error {
+	return DrawImageColor(target, img, x, y, ColorMatrixI())
+}
+
+func DrawImageGeometry(target *Image, img *Image, geo GeometryMatrix) error {
+	return DrawImageGeometryColor(target, img, geo, ColorMatrixI())
+}
+
+func DrawImageColor(target *Image, img *Image, x, y int, color ColorMatrix) error {
+	geo := TranslateGeometry(float64(x), float64(y))
+	return DrawImageGeometryColor(target, img, geo, color)
+}
+
+func DrawImageGeometryColor(target *Image, img *Image, geo GeometryMatrix, color ColorMatrix) error {
+	w, h := img.Size()
+	dsts := []image.Rectangle{image.Rect(0, 0, w, h)}
+	srcs := []image.Rectangle{image.Rect(0, 0, w, h)}
+	return DrawImagePartsGeometryColor(target, dsts, img, srcs, geo, color)
+}
+
+func DrawImageParts(target *Image, dsts []image.Rectangle, img *Image, srcs []image.Rectangle, x, y int) error {
+	return DrawImagePartsColor(target, dsts, img, srcs, x, y, ColorMatrixI())
+}
+
+func DrawImagePartsGeometry(target *Image, dsts []image.Rectangle, img *Image, srcs []image.Rectangle, geo GeometryMatrix) error {
+	return DrawImagePartsGeometryColor(target, dsts, img, srcs, geo, ColorMatrixI())
+}
+
+func DrawImagePartsColor(target *Image, dsts []image.Rectangle, img *Image, srcs []image.Rectangle, x, y int, color ColorMatrix) error {
+	geo := TranslateGeometry(float64(x), float64(y))
+	return DrawImagePartsGeometryColor(target, dsts, img, srcs, geo, color)
+}
+
+func DrawImagePartsGeometryColor(target *Image, dsts []image.Rectangle, img *Image, srcs []image.Rectangle, geo GeometryMatrix, color ColorMatrix) error {
+	return target.DrawImage(dsts, img, srcs, geo, color)
+}

ebitenutil/debugprint.go

@@ -55,14 +55,13 @@ func (d *debugPrintState) drawText(rt *ebiten.Image, str string, x, y int, c col
 		srcs = append(srcs, src)
 		locationX += assets.TextImageCharWidth
 	}
-	geo := ebiten.TranslateGeometry(float64(x)+1, float64(y))
 	cc := color.NRGBA64Model.Convert(c).(color.NRGBA64)
 	r := float64(cc.R) / math.MaxUint16
 	g := float64(cc.G) / math.MaxUint16
 	b := float64(cc.B) / math.MaxUint16
 	a := float64(cc.A) / math.MaxUint16
 	clr := ebiten.ScaleColor(r, g, b, a)
-	rt.DrawImage(dsts, d.textImage, srcs, geo, clr)
+	ebiten.DrawImagePartsColor(rt, dsts, d.textImage, srcs, x+1, y, clr)
 }
 
 func (d *debugPrintState) DebugPrint(r *ebiten.Image, str string) {

example/alphablending/main.go

@@ -51,18 +51,15 @@ func update(screen *ebiten.Image) error {
 		return err
 	}
 	for i := 0; i < 10; i++ {
-		geo := ebiten.TranslateGeometry(15+float64(i)*(diff), 20)
 		clr := ebiten.ScaleColor(1.0, 1.0, 1.0, 0.5)
-		if err := ebiten.DrawWholeImage(tmpRenderTarget, ebitenImage, geo, clr); err != nil {
+		if err := ebiten.DrawImageColor(tmpRenderTarget, ebitenImage, 15+int(float64(i)*diff), 20, clr); err != nil {
 			return err
 		}
 	}
 
 	screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
 	for i := 0; i < 10; i++ {
-		geo := ebiten.TranslateGeometry(0, float64(i)*(diff))
-		clr := ebiten.ColorMatrixI()
-		if err := ebiten.DrawWholeImage(screen, tmpRenderTarget, geo, clr); err != nil {
+		if err := ebiten.DrawImage(screen, tmpRenderTarget, 0, int(float64(i)*diff)); err != nil {
 			return err
 		}
 	}

example/blocks/blocks/field.go

@@ -112,11 +112,11 @@ func (f *Field) flushLine(j int) bool {
 	return true
 }
 
-func (f *Field) Draw(r *ebiten.Image, images *Images, geo ebiten.GeometryMatrix) {
+func (f *Field) Draw(r *ebiten.Image, images *Images, x, y int) {
 	blocks := make([][]BlockType, len(f.blocks))
 	for i, blockCol := range f.blocks {
 		blocks[i] = make([]BlockType, len(blockCol))
 		copy(blocks[i], blockCol[:])
 	}
-	drawBlocks(r, images, blocks, geo)
+	drawBlocks(r, images, blocks, x, y)
 }

example/blocks/blocks/gamescene.go

@@ -117,11 +117,9 @@ func (s *GameScene) Draw(r *ebiten.Image, images *Images) {
 	geoMat := ebiten.ScaleGeometry(float64(fieldWidth)/float64(w), float64(fieldHeight)/float64(h))
 	geoMat.Concat(ebiten.TranslateGeometry(20, 20)) // TODO: magic number?
 	colorMat := ebiten.ScaleColor(0.0, 0.0, 0.0, 0.5)
-	ebiten.DrawWholeImage(r, field, geoMat, colorMat)
+	ebiten.DrawImageGeometryColor(r, field, geoMat, colorMat)
 
-	geoMat = ebiten.GeometryMatrixI()
-	geoMat.Concat(ebiten.TranslateGeometry(20, 20))
-	s.field.Draw(r, images, geoMat)
+	s.field.Draw(r, images, 20, 20)
 
 	if s.currentPiece != nil {
 		s.currentPiece.Draw(r, images, 20, 20, s.currentPieceX, s.currentPieceY, s.currentPieceAngle)

example/blocks/blocks/piece.go

@@ -139,7 +139,7 @@ const blockHeight = 10
 const fieldBlockNumX = 10
 const fieldBlockNumY = 20
 
-func drawBlocks(r *ebiten.Image, images *Images, blocks [][]BlockType, geo ebiten.GeometryMatrix) {
+func drawBlocks(r *ebiten.Image, images *Images, blocks [][]BlockType, x, y int) {
 	dsts, srcs := []image.Rectangle{}, []image.Rectangle{}
 	for i, blockCol := range blocks {
 		for j, block := range blockCol {
@@ -154,7 +154,7 @@ func drawBlocks(r *ebiten.Image, images *Images, blocks [][]BlockType, geo ebite
 		}
 	}
 	blocksImage := images.GetImage("blocks")
-	r.DrawImage(dsts, blocksImage, srcs, geo, ebiten.ColorMatrixI())
+	ebiten.DrawImageParts(r, dsts, blocksImage, srcs, x, y)
 }
 
 func (p *Piece) InitialPosition() (int, int) {
@@ -226,10 +226,7 @@ func (p *Piece) Draw(r *ebiten.Image, images *Images, fieldX, fieldY int, pieceX
 		}
 	}
 
-	geoMat := ebiten.GeometryMatrixI()
 	x := fieldX + pieceX*blockWidth
 	y := fieldY + pieceY*blockHeight
-	geoMat.Concat(ebiten.TranslateGeometry(float64(x), float64(y)))
-
-	drawBlocks(r, images, blocks, geoMat)
+	drawBlocks(r, images, blocks, x, y)
 }

example/blocks/blocks/scenemanager.go

@@ -73,12 +73,11 @@ func (s *SceneManager) Draw(r *ebiten.Image, images *Images) {
 	to.Clear()
 	s.next.Draw(to, images)
 
-	color := ebiten.ColorMatrixI()
-	ebiten.DrawWholeImage(r, from, ebiten.GeometryMatrixI(), color)
+	ebiten.DrawImage(r, from, 0, 0)
 
 	alpha := float64(s.transitionCount) / float64(transitionMaxCount)
-	color.Elements[3][3] = alpha
-	ebiten.DrawWholeImage(r, to, ebiten.GeometryMatrixI(), color)
+	color := ebiten.ScaleColor(1, 1, 1, alpha)
+	ebiten.DrawImageColor(r, to, 0, 0, color)
 }
 
 func (s *SceneManager) GoTo(scene Scene) {

example/blocks/blocks/titlescene.go

@@ -68,10 +68,7 @@ func drawTitleBackground(r *ebiten.Image, images *Images, c int) {
 
 	dx := (-c / 4) % imageWidth
 	dy := (c / 4) % imageHeight
-	geo := ebiten.GeometryMatrixI()
-	geo.Concat(ebiten.TranslateGeometry(float64(dx), float64(dy)))
-	clr := ebiten.ColorMatrixI()
-	r.DrawImage(dsts, backgroundImage, srcs, geo, clr)
+	ebiten.DrawImageParts(r, dsts, backgroundImage, srcs, dx, dy)
 }
 
 func drawLogo(r *ebiten.Image, images *Images, str string) {

example/image/main.go

@@ -58,9 +58,7 @@ func Update(screen *ebiten.Image) error {
 	geo.Concat(ebiten.ScaleGeometry(scaleX, scaleY))
 	geo.Concat(ebiten.RotateGeometry(float64(count%720) * 2 * math.Pi / 720))
 	geo.Concat(ebiten.TranslateGeometry(screenWidth/2, screenHeight/2))
-	//clr := ebiten.RotateHue(float64(count%180) * 2 * math.Pi / 180)
-	clr := ebiten.ColorMatrixI()
-	if err := ebiten.DrawWholeImage(screen, gophersImage, geo, clr); err != nil {
+	if err := ebiten.DrawImageGeometry(screen, gophersImage, geo); err != nil {
 		return err
 	}
 	return nil

example/mosaic/main.go

@@ -37,10 +37,10 @@ var (
 
 func Update(screen *ebiten.Image) error {
 	geo := ebiten.ScaleGeometry(1.0/mosaicRatio, 1.0/mosaicRatio)
-	ebiten.DrawWholeImage(gophersRenderTarget, gophersImage, geo, ebiten.ColorMatrixI())
+	ebiten.DrawImageGeometry(gophersRenderTarget, gophersImage, geo)
 
 	geo = ebiten.ScaleGeometry(mosaicRatio/2.0, mosaicRatio/2.0)
-	ebiten.DrawWholeImage(screen, gophersRenderTarget, geo, ebiten.ColorMatrixI())
+	ebiten.DrawImageGeometry(screen, gophersRenderTarget, geo)
 	return nil
 }
 

example/paint/main.go

@@ -44,14 +44,13 @@ func Update(screen *ebiten.Image) error {
 	mx, my := ebiten.CursorPosition()
 
 	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
-		geo := ebiten.TranslateGeometry(float64(mx), float64(my))
 		clr := ebiten.ScaleColor(1.0, 0.25, 0.25, 1.0)
 		theta := 2.0 * math.Pi * float64(count%60) / 60.0
 		clr.Concat(ebiten.RotateHue(theta))
-		ebiten.DrawWholeImage(canvasRenderTarget, brushRenderTarget, geo, clr)
+		ebiten.DrawImageColor(canvasRenderTarget, brushRenderTarget, mx, my, clr)
 	}
 
-	ebiten.DrawWholeImage(screen, canvasRenderTarget, ebiten.GeometryMatrixI(), ebiten.ColorMatrixI())
+	ebiten.DrawImage(screen, canvasRenderTarget, 0, 0)
 
 	ebitenutil.DebugPrint(screen, fmt.Sprintf("(%d, %d)", mx, my))
 	return nil

example/perspective/main.go

@@ -46,7 +46,7 @@ func Update(screen *ebiten.Image) error {
 	geo := ebiten.TranslateGeometry(-maxWidth/2, -float64(h)/2)
 	geo.Concat(ebiten.ScaleGeometry(0.4, 0.4))
 	geo.Concat(ebiten.TranslateGeometry(screenWidth/2, screenHeight/2))
-	screen.DrawImage(dsts, gophersImage, srcs, geo, ebiten.ColorMatrixI())
+	ebiten.DrawImagePartsGeometry(screen, dsts, gophersImage, srcs, geo)
 	return nil
 }
 

graphics.go

@@ -18,17 +18,8 @@ package ebiten
 
 import (
 	"github.com/hajimehoshi/ebiten/internal/opengl"
-	"image"
 )
 
-// DrawWholeImage draws the whole image.
-func DrawWholeImage(target *Image, img *Image, geo GeometryMatrix, color ColorMatrix) error {
-	w, h := img.Size()
-	dsts := []image.Rectangle{image.Rect(0, 0, w, h)}
-	srcs := []image.Rectangle{image.Rect(0, 0, w, h)}
-	return target.DrawImage(dsts, img, srcs, geo, color)
-}
-
 // Filter represents the type of filter to be used when an image is maginified or minified.
 type Filter opengl.Filter
 

image_test.go

@@ -104,9 +104,9 @@ func TestComposition(t *testing.T) {
 		t.Fatal(err)
 		return
 	}
-	DrawWholeImage(img2, img1, GeometryMatrixI(), ColorMatrixI())
-	DrawWholeImage(img3, img2, GeometryMatrixI(), ColorMatrixI())
-	DrawWholeImage(img_12_3, img3, GeometryMatrixI(), ColorMatrixI())
+	DrawImageGeometryColor(img2, img1, GeometryMatrixI(), ColorMatrixI())
+	DrawImageGeometryColor(img3, img2, GeometryMatrixI(), ColorMatrixI())
+	DrawImageGeometryColor(img_12_3, img3, GeometryMatrixI(), ColorMatrixI())
 
 	img2.Fill(img2Color)
 	img3.Fill(img3Color)
@@ -115,9 +115,9 @@ func TestComposition(t *testing.T) {
 		t.Fatal(err)
 		return
 	}
-	DrawWholeImage(img3, img2, GeometryMatrixI(), ColorMatrixI())
-	DrawWholeImage(img3, img1, GeometryMatrixI(), ColorMatrixI())
-	DrawWholeImage(img_1_23, img3, GeometryMatrixI(), ColorMatrixI())
+	DrawImageGeometryColor(img3, img2, GeometryMatrixI(), ColorMatrixI())
+	DrawImageGeometryColor(img3, img1, GeometryMatrixI(), ColorMatrixI())
+	DrawImageGeometryColor(img_1_23, img3, GeometryMatrixI(), ColorMatrixI())
 
 	for j := 0; j < h; j++ {
 		for i := 0; i < w; i++ {