112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
//go:build !js
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// +build !js
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package native
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import (
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"errors"
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"fmt"
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"image"
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"git.kirsle.net/SketchyMaze/doodle/pkg/shmem"
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"git.kirsle.net/go/render"
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"git.kirsle.net/go/render/sdl"
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sdl2 "github.com/veandco/go-sdl2/sdl"
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"github.com/veandco/go-sdl2/ttf"
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)
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// Native render engine functions (SDL2 edition),
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// not for JavaScript/WASM yet.
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// HasTouchscreen checks if the device has at least one SDL_GetNumTouchDevices.
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func HasTouchscreen(e render.Engine) bool {
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if _, ok := e.(*sdl.Renderer); ok {
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return sdl2.GetNumTouchDevices() > 0
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}
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return false
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}
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// CopyToClipboard puts some text on your clipboard.
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func CopyToClipboard(text string) error {
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if _, ok := shmem.CurrentRenderEngine.(*sdl.Renderer); ok {
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return sdl2.SetClipboardText(text)
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}
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return errors.New("not supported")
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}
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// CountTextures returns the count of loaded SDL2 textures, for the F3 debug overlay, or "n/a"
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func CountTextures(e render.Engine) string {
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var texCount = "n/a"
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if sdl, ok := e.(*sdl.Renderer); ok {
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texCount = fmt.Sprintf("%d", sdl.CountTextures())
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}
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return texCount
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}
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/*
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TextToImage takes an SDL2_TTF texture and makes it into a Go image.
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Notes:
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- The text is made Black & White with a white background on the image.
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- Drop shadow, stroke, etc. probably not supported.
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- Returns a non-antialiased image.
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*/
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func TextToImage(e render.Engine, text render.Text) (image.Image, error) {
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// engine, _ := e.(*sdl.Renderer)
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// Make the text black & white for ease of identifying pixels.
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text.Color = render.Black
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var (
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// renderer = engine.GetSDL2Renderer()
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font *ttf.Font
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surface *sdl2.Surface
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pixFmt *sdl2.PixelFormat
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surface2 *sdl2.Surface
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err error
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)
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if font, err = sdl.LoadFont(text.FontFilename, text.Size); err != nil {
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return nil, err
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}
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if surface, err = font.RenderUTF8Solid(text.Text, sdl.ColorToSDL(text.Color)); err != nil {
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return nil, err
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}
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defer surface.Free()
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// Convert the Surface into a pixelformat that supports the .At(x,y)
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// function properly, as the one we got above is "Not implemented"
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if pixFmt, err = sdl2.AllocFormat(sdl2.PIXELFORMAT_RGB888); err != nil {
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return nil, err
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}
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if surface2, err = surface.Convert(pixFmt, 0); err != nil {
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return nil, err
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}
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defer surface2.Free()
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// Read back the pixels.
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var (
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x int
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y int
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w = int(surface2.W)
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h = int(surface2.H)
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img = image.NewRGBA(image.Rect(x, y, w, h))
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)
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for x = 0; x < w; x++ {
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for y = 0; y < h; y++ {
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hue := surface2.At(x, y)
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img.Set(x, y, hue)
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// log.Warn("hue: %s", hue)
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// r, g, b, _ := hue.RGBA()
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// if r == 0 && g == 0 && b == 0 {
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// img.Set(x, y, hue)
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// } else {
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// img.Set(x, y, color.Transparent)
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// }
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}
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}
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return img, nil
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}
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