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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** Display Management (Display) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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#define REDVAL(_c) (GX_UBYTE)((_c) >> 16) |
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#define GREENVAL(_c) (GX_UBYTE)((_c) >> 8) |
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#define BLUEVAL(_c) (GX_UBYTE)(_c) |
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#define ASSEMBLECOLOR(_r, _g, _b) \ |
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((0xff << 24) | \ |
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((_r) << 16) | \ |
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((_g) << 8) | \ |
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(_b)) |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_display.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_display_driver_24xrgb_pixel_blend PORTABLE C */ |
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/* 6.1.3 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* Pixel blend function for 24xrgb color format. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* context Drawing context */ |
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/* x X coordinate */ |
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/* y Y coordinate */ |
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/* color Color of line to write */ |
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/* alpha Alpha value */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* REDVAL Extract the red component */ |
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/* GREENVAL Extract the green component */ |
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/* BLUEVAL Extract the blue component */ |
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/* ASSEMBLECOLOR Assemble color components */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* GUIX Internal Code */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
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/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* 12-31-2020 Kenneth Maxwell Modified comment(s), */ |
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/* set alpha value as 0xff, */ |
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/* resulting in version 6.1.3 */ |
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/* */ |
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/**************************************************************************/ |
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1824607461 |
VOID _gx_display_driver_24xrgb_pixel_blend(GX_DRAW_CONTEXT *context, INT x, INT y, GX_COLOR fcolor, GX_UBYTE alpha) |
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{ |
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GX_UBYTE fred, fgreen, fblue; |
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GX_UBYTE bred, bgreen, bblue; |
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GX_UBYTE balpha; |
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ULONG bcolor; |
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ULONG *put; |
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/* Is the pixel non-transparent? */ |
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✓✓ |
1824607461 |
if (alpha > 0) |
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{ |
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/* calculate address of pixel */ |
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1781567954 |
put = (ULONG *)context -> gx_draw_context_memory; |
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1781567954 |
put += context -> gx_draw_context_pitch * y; |
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1781567954 |
put += x; |
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/* No need to blend if alpha value is 255. */ |
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✓✓ |
1781567954 |
if (alpha == 255) |
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{ |
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369384232 |
*put = (ULONG)(fcolor | 0xff000000); |
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return; |
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} |
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/* split foreground into red, green, and blue components */ |
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1412183722 |
fred = REDVAL(fcolor); |
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1412183722 |
fgreen = GREENVAL(fcolor); |
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1412183722 |
fblue = BLUEVAL(fcolor); |
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/* read background color */ |
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1412183722 |
bcolor = *put; |
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/* split background color into red, green, and blue components */ |
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1412183722 |
bred = REDVAL(bcolor); |
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bgreen = GREENVAL(bcolor); |
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1412183722 |
bblue = BLUEVAL(bcolor); |
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/* background alpha is inverse of foreground alpha */ |
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1412183722 |
balpha = (GX_UBYTE)(256 - alpha); |
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/* blend foreground and background, each color channel */ |
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1412183722 |
fred = (GX_UBYTE)(((bred * balpha) + (fred * alpha)) >> 8); |
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fgreen = (GX_UBYTE)(((bgreen * balpha) + (fgreen * alpha)) >> 8); |
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fblue = (GX_UBYTE)(((bblue * balpha) + (fblue * alpha)) >> 8); |
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/* re-assemble into 32-bit color and write it out */ |
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*put = (ULONG)(ASSEMBLECOLOR(fred, fgreen, fblue)); |
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} |
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} |
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