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force_image_blend(3) Arcan Lua API force_image_blend(3) NAME force_image_blend - Control image blend behaviour SYNOPSIS nil force_image_blend( vid:dst ) force_image_blend( vid:dst, int:mode ) DESCRIPTION There are a number of controls for adjusting how overlapping objects that are translucent or has transparent contents described by an alpha color channel are supposed to combine. This function can be used to change that behavior. If no mode is set, the system default will be set. Other blend- modes are: BLEND_NORMAL (disable blending if object opacity is marked as opaque) BLEND_ADD (one, one: additive blending, rgb channels will be com- bined) BLEND_SUB (one: dst will be subtracted based on one-src alpha), BLEND_MUL (dst-color, one-src alpha), BLEND_PREMULTIPLIED (one, one-src alpha: the source object has its alpha values pre-multiplied into the color channels) NOTES 1 The default can be changed by calling switch_default_blendmode . EXAMPLE function force_image_blend0() a = fill_surface(32, 32, 255, 0, 0); blend_image(a, 0.5); force_image_blend(a, BLEND_ADD); end MISUSE function force_image_blend0() force_image_blend(BADID, BLEND_NORMAL); end MISUSE function force_image_blend1() a = fill_surface(32, 32, 255, 0, 0); force_image_blend(a, -10); end image August 2026 force_image_blend(3)
NAME | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLE | MISUSE | MISUSE
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