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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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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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#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_32argb_rotated_pixel_blend PORTABLE C */ |
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/* 6.1.4 */ |
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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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/* Rotated Pixel blend function for 32argb 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 blending value 0 to 255 */ |
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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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/* None */ |
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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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/**************************************************************************/ |
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VOID _gx_display_driver_32argb_rotated_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 oalpha; |
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ULONG bcolor; |
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ULONG *put; |
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INT combined_alpha; |
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falpha = ALPHAVAL_32BPP(fcolor); |
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falpha = (GX_UBYTE)((falpha * alpha) / 255); |
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/* Is the pixel non-transparent? */ |
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✓✓ |
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if (falpha > 0) |
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{ |
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/* Calculate address of pixel. */ |
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put = (ULONG *)context -> gx_draw_context_memory; |
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GX_SWAP_VALS(x, y); |
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✓✓ |
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if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW) |
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{ |
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y = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - y - 1; |
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} |
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else |
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{ |
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x = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - x - 1; |
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} |
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put += context -> gx_draw_context_pitch * y; |
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put += x; |
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/* No need to blend if alpha value is 255. */ |
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✓✓ |
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if (falpha == 255) |
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{ |
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*put = (ULONG)fcolor; |
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return; |
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} |
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/* Split foreground into alpha, red, green, and blue components. */ |
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fred = REDVAL_32BPP(fcolor); |
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fgreen = GREENVAL_32BPP(fcolor); |
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fblue = BLUEVAL_32BPP(fcolor); |
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/* Read background color. */ |
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bcolor = *put; |
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/* Split background color into red, green, and blue components. */ |
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balpha = ALPHAVAL_32BPP(bcolor); |
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bred = REDVAL_32BPP(bcolor); |
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bgreen = GREENVAL_32BPP(bcolor); |
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bblue = BLUEVAL_32BPP(bcolor); |
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/* Background alpha is inverse of foreground alpha. */ |
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combined_alpha = (falpha * balpha) / 0xff; |
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/* Blend foreground and background, each color channel. */ |
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oalpha = (GX_UBYTE)(falpha + balpha - combined_alpha); |
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fred = (GX_UBYTE)((fred * falpha + bred * balpha - bred * combined_alpha) / oalpha); |
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fgreen = (GX_UBYTE)((fgreen * falpha + bgreen * balpha - bgreen * combined_alpha) / oalpha); |
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fblue = (GX_UBYTE)((fblue * falpha + bblue * balpha - bblue * combined_alpha) / oalpha); |
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/* Re-assemble into 16-bit color and write it out. */ |
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*put = (ULONG)ASSEMBLECOLOR_32ARGB(oalpha, fred, fgreen, fblue); |
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} |
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} |
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