68 lines
1.8 KiB
V
68 lines
1.8 KiB
V
module sapp
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import os
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import stbi
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// v_sapp_gl_read_rgba_pixels reads pixles from the OpenGL buffer into `pixels`.
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fn C.v_sapp_gl_read_rgba_pixels(x int, y int, width int, height int, pixels charptr)
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// screenshot takes a screenshot of the current window and
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// saves it to `path`. The format is inferred from the extension
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// of the file name in `path`.
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//
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// Supported formats are: `.png`, `.ppm`.
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pub fn screenshot(path string) ? {
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match os.file_ext(path) {
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'.png' {
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return screenshot_png(path)
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}
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'.ppm' {
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return screenshot_ppm(path)
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}
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else {
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return error(@MOD + '.' + @FN + ' currently only supports .png and .ppm files.')
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}
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}
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}
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// screenshot_ppm takes a screenshot of the current window and
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// saves it to `path` as a .ppm file.
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[manualfree]
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pub fn screenshot_ppm(path string) ? {
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ss := screenshot_window()
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write_rgba_to_ppm(path, ss.width, ss.height, 4, ss.pixels) ?
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unsafe { ss.destroy() }
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}
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// screenshot_png takes a screenshot of the current window and
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// saves it to `path` as a .png file.
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[manualfree]
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pub fn screenshot_png(path string) ? {
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ss := screenshot_window()
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stbi.set_flip_vertically_on_write(true)
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stbi.stbi_write_png(path, ss.width, ss.height, 4, ss.pixels, ss.width * 4) ?
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unsafe { ss.destroy() }
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}
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// write_rgba_to_ppm writes `pixels` data in RGBA format to PPM3 format.
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fn write_rgba_to_ppm(path string, w int, h int, components int, pixels &u8) ? {
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mut f_out := os.create(path) ?
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defer {
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f_out.close()
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}
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f_out.writeln('P3') ?
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f_out.writeln('$w $h') ?
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f_out.writeln('255') ?
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for i := h - 1; i >= 0; i-- {
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for j := 0; j < w; j++ {
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idx := i * w * components + j * components
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unsafe {
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r := int(pixels[idx])
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g := int(pixels[idx + 1])
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b := int(pixels[idx + 2])
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f_out.write_string('$r $g $b ') ?
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}
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}
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}
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}
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