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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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/* 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_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 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_24BPP Extract the red component */ |
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/* GREENVAL_24BPP Extract the green component */ |
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/* BLUEVAL_24BPP Extract the blue component */ |
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/* ASSEMBLECOLOR_24BPP 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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/* 02-02-2021 Kenneth Maxwell Initial Version 6.1.4 */ |
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/* */ |
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/**************************************************************************/ |
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1609540 |
VOID _gx_display_driver_24xrgb_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 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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✓✓ |
1609540 |
if (alpha > 0) |
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{ |
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/* Calculate address of pixel. */ |
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1604084 |
put = (ULONG *)context -> gx_draw_context_memory; |
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✓✓ |
1604084 |
if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW) |
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{ |
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712965 |
put += context -> gx_draw_context_pitch * (context -> gx_draw_context_canvas -> gx_canvas_x_resolution - x - 1); |
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712965 |
put += y; |
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} |
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else |
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{ |
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put += context -> gx_draw_context_pitch * x; |
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put += (context -> gx_draw_context_canvas -> gx_canvas_y_resolution - y - 1); |
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} |
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/* No need to blend if alpha value is 255. */ |
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✓✓ |
1604084 |
if (alpha == 255) |
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{ |
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*put = (ULONG)(fcolor | 0xff000000); |
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5834 |
return; |
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} |
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/* Split foreground into red, green, and blue components. */ |
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1598250 |
fred = REDVAL_24BPP(fcolor); |
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fgreen = GREENVAL_24BPP(fcolor); |
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fblue = BLUEVAL_24BPP(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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bred = REDVAL_24BPP(bcolor); |
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bgreen = GREENVAL_24BPP(bcolor); |
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bblue = BLUEVAL_24BPP(bcolor); |
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/* Background alpha is inverse of foreground alpha. */ |
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balpha = (GX_UBYTE)(256 - alpha); |
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/* Blend foreground and background, each color channel. */ |
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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_32ARGB(0xff, fred, fgreen, fblue)); |
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} |
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} |
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