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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 _COLOR_FORMAT_ 565rgb /*what's this for??*/ |
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#define PIXEL_LOC USHORT |
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#define ALPHAVAL(_c) (GX_UBYTE)(((_c) >> 12) & 0xf) |
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#define REDVAL(_c) (GX_UBYTE)(((_c) >> 8) & 0xf) |
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#define GREENVAL(_c) (GX_UBYTE)(((_c) >> 4) & 0xf) |
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#define BLUEVAL(_c) (GX_UBYTE)((_c) & 0xf) |
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#define ASSEMBLECOLOR_4444ARGB(_a, _r, _g, _b) \ |
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(((_a) << 12) | \ |
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((_r) << 8) | \ |
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((_g) << 4) | \ |
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((_b) & 0xf)) |
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#define ExtendToByte(_a) _a |= (GX_UBYTE)(_a << 4) |
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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_4444argb_pixel_blend PORTABLE C */ |
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/* 6.1 */ |
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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 565rgb 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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/* */ |
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/**************************************************************************/ |
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86699228 |
VOID _gx_display_driver_4444argb_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 falpha, fred, fgreen, fblue; |
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GX_UBYTE balpha, bred, bgreen, bblue; |
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GX_UBYTE inv_alpha; |
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INT combined_alpha; |
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USHORT bcolor; |
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USHORT *put; |
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86699228 |
falpha = ALPHAVAL(fcolor); |
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86699228 |
falpha = (GX_UBYTE)(falpha | (falpha << 4)); |
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86699228 |
combined_alpha = falpha * alpha; |
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combined_alpha /= 255; |
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/* Is the pixel non-transparent? */ |
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✓✓ |
86699228 |
if (combined_alpha > 0) |
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{ |
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/* calculate address of pixel */ |
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78040207 |
put = (USHORT *)context -> gx_draw_context_memory; |
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78040207 |
put += context -> gx_draw_context_pitch * y; |
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78040207 |
put += x; |
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/* No need to blend if alpha value is 255. */ |
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✓✓ |
78040207 |
if (combined_alpha == 255) |
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{ |
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67157787 |
*put = (USHORT)fcolor; |
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67157787 |
return; |
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} |
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/* split foreground into red, green, and blue components */ |
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10882420 |
fred = REDVAL(fcolor); |
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10882420 |
ExtendToByte(fred); |
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10882420 |
fgreen = GREENVAL(fcolor); |
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10882420 |
ExtendToByte(fgreen); |
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10882420 |
fblue = BLUEVAL(fcolor); |
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10882420 |
ExtendToByte(fblue); |
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/* read background color */ |
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10882420 |
bcolor = *put; |
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/* split background color into red, green, and blue components */ |
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10882420 |
balpha = ALPHAVAL(bcolor); |
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10882420 |
ExtendToByte(balpha); |
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10882420 |
bred = REDVAL(bcolor); |
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10882420 |
ExtendToByte(bred); |
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bgreen = GREENVAL(bcolor); |
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10882420 |
ExtendToByte(bgreen); |
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bblue = BLUEVAL(bcolor); |
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10882420 |
ExtendToByte(bblue); |
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/* background alpha is inverse of foreground alpha */ |
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10882420 |
inv_alpha = (GX_UBYTE)(256 - combined_alpha); |
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/* blend foreground and background, each color channel */ |
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10882420 |
falpha = (GX_UBYTE)(((balpha * inv_alpha) + (falpha * combined_alpha)) >> 12); |
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fred = (GX_UBYTE)(((bred * inv_alpha) + (fred * combined_alpha)) >> 12); |
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fgreen = (GX_UBYTE)(((bgreen * inv_alpha) + (fgreen * combined_alpha)) >> 12); |
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fblue = (GX_UBYTE)(((bblue * inv_alpha) + (fblue * combined_alpha)) >> 12); |
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/* re-assemble into 16-bit color and write it out */ |
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10882420 |
*put = (USHORT)ASSEMBLECOLOR_4444ARGB(falpha, fred, fgreen, fblue); |
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} |
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} |
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