Raw screenshots have duplicated pixels and no Pixel Aspect Ratio metadata about dosbox-x HOT 5 CLOSED

At this moment, the raw capture mode is more of a direct capture of the pixel values as rasterized by the monitor, so if you're using a 200-line graphics mode on VGA, and the VGA is doubling each scan line as VGA normally does in those modes, then the raw capture will contain the raw pixel values, scan line doubled.

Good point on the aspect ratio fields though, I think I can figure out how to use libpng to write that.

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I'm sorry if "raw" is confusing in that it's not exactly a snapshot of video memory, but only a snapshot of the raw pixel values from video memory as they are rasterized to the screen.

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http://www.libpng.org/pub/png/book/chapter11.html#png.ch11.div.9

And the libpng function is png_set_pHYs but only if PNG_pHYs_SUPPORTED.

#ifdef PNG_pHYs_SUPPORTED
PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr,
    png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
#endif

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Done. See latest commit.

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FYI, DOSBox Staging now has a revised raw capture mode which writes the raw framebuffer, e.g., 640x200 as 640x200.

Plus we also write the aspect ratio info into the PNG header, and we introduced the "upscaled" mode which essentially does aspect ratio correct upscaling via bilinear sharp to roughly 1200px of vertical resolution as most image viewers can only do square pixels.

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