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Added support for rendering a partial texture.

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This commit is contained in:
Sander Schobers 2020-05-23 08:20:04 +02:00
parent 23115b8a0f
commit 3bab08a0a6
3 changed files with 44 additions and 11 deletions
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22
allg5ui/renderer.go
View File

@ -237,7 +237,10 @@ func (r *Renderer) DrawTexture(texture ui.Texture, p geom.RectangleF32) {
}
func (r *Renderer) DrawTextureOptions(texture ui.Texture, p geom.RectangleF32, opts ui.DrawOptions) {
bmp := r.mustGetBitmap(texture)
bmp, ok := r.mustGetSubBitmap(texture, opts.Source)
if ok {
defer bmp.Destroy()
}
x, y := snap(p.Min)
var o allg5.DrawOptions
if opts.Tint != nil {
@ -259,7 +262,10 @@ func (r *Renderer) DrawTexturePoint(texture ui.Texture, p geom.PointF32) {
}
func (r *Renderer) DrawTexturePointOptions(texture ui.Texture, p geom.PointF32, opts ui.DrawOptions) {
bmp := r.mustGetBitmap(texture)
bmp, ok := r.mustGetSubBitmap(texture, opts.Source)
if ok {
defer bmp.Destroy()
}
var o allg5.DrawOptions
if opts.Tint != nil {
tint := newColor(opts.Tint)
@ -281,6 +287,18 @@ func (r *Renderer) mustGetBitmap(t ui.Texture) *allg5.Bitmap {
return texture.bmp
}
func (r *Renderer) mustGetSubBitmap(t ui.Texture, source *geom.RectangleF32) (*allg5.Bitmap, bool) {
texture, ok := t.(*texture)
if !ok {
panic("texture must be created on same renderer")
}
if source == nil {
return texture.bmp, false
}
src := source.ToInt()
return texture.bmp.Sub(src.Min.X, src.Min.Y, src.Dx(), src.Dy()), true
}
func (r *Renderer) Rectangle(rect geom.RectangleF32, c color.Color, thickness float32) {
minX, minY := snap(rect.Min)
maxX, maxY := snap(rect.Max)

30
sdlui/renderer.go
View File

@ -311,11 +311,17 @@ func (r *Renderer) DrawTextureOptions(t ui.Texture, dst geom.RectangleF32, opts
if !ok {
return
}
width, height, err := texture.Size()
if err != nil {
return
var source sdl.Rect
if opts.Source != nil {
source = RectAbs(int32(opts.Source.Min.X), int32(opts.Source.Min.Y), int32(opts.Source.Max.X), int32(opts.Source.Max.Y))
} else {
width, height, err := texture.Size()
if err != nil {
return
}
source = Rect(0, 0, width, height)
}
r.drawTexture(texture, Rect(0, 0, width, height), RectAbs(int32(dst.Min.X), int32(dst.Min.Y), int32(dst.Max.X), int32(dst.Max.Y)), opts)
r.drawTexture(texture, source, RectAbs(int32(dst.Min.X), int32(dst.Min.Y), int32(dst.Max.X), int32(dst.Max.Y)), opts)
}
func (r *Renderer) DrawTexturePoint(t ui.Texture, dst geom.PointF32) {
@ -327,11 +333,19 @@ func (r *Renderer) DrawTexturePointOptions(t ui.Texture, dst geom.PointF32, opts
if !ok {
return
}
width, height, err := texture.Size()
if err != nil {
return
var source, destination sdl.Rect
if opts.Source != nil {
source = RectAbs(int32(opts.Source.Min.X), int32(opts.Source.Min.Y), int32(opts.Source.Max.X), int32(opts.Source.Max.Y))
destination = Rect(int32(dst.X), int32(dst.Y), source.W, source.H)
} else {
width, height, err := texture.Size()
if err != nil {
return
}
source = Rect(0, 0, width, height)
destination = Rect(int32(dst.X), int32(dst.Y), width, height)
}
r.drawTexture(texture, Rect(0, 0, width, height), Rect(int32(dst.X), int32(dst.Y), width, height), opts)
r.drawTexture(texture, source, destination, opts)
}
func (r *Renderer) FillRectangle(rect geom.RectangleF32, c color.Color) {

3
ui/drawoptions.go
View File

@ -7,7 +7,8 @@ import (
)
type DrawOptions struct {
Tint color.Color
Source *geom.RectangleF32
Tint color.Color
}
func ScaleToHeight(size geom.PointF32, height float32) (*geom.PointF32, float32) {