forked from AbleOS/ableos
52 lines
1.1 KiB
Plaintext
52 lines
1.1 KiB
Plaintext
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.{Color, Surface, new_surface, put_surface} := @use("../lib.hb");
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.{log, memory} := @use("../../../stn/src/lib.hb")
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BitmapFileHeader := packed struct {
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magic: u16,
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size: u32,
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reserved_1: u16,
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reserved_2: u16,
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offset: u32,
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}
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BitmapInfoHeader := packed struct {
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size: u32,
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width: i32,
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height: i32,
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planes: u16,
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bits: u16,
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compression: u32,
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image_size: u32,
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x_resolution: i32,
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y_resolution: i32,
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n_colours: u32,
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important_colours: u32,
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}
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BitmapColorHeader := packed struct {
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red_mask: u32,
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green_mask: u32,
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blue_mask: u32,
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alpha_mask: u32,
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color_space_type: u32,
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unused: u32,
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}
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from := fn(bmp: ^u8): ?Surface {
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file_header := @as(^BitmapFileHeader, @bitcast(bmp))
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info_header := @as(^BitmapInfoHeader, @bitcast(bmp + @sizeof(BitmapFileHeader)))
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bmp += file_header.offset
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if file_header.magic != 0x4D42 | info_header.width == 0 | info_header.height == 0 {
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log.error("Invalid BMP image.\0")
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return null
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}
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width := @as(uint, info_header.width)
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height := @as(uint, info_header.height)
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lhs := Surface.(@bitcast(bmp), width, height)
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rhs := new_surface(width, height)
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put_surface(rhs, lhs, .(0, 0), true)
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return rhs
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}
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