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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 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 macros for assembling a 24-bit r:g:b value from 3 components. */ |
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#define ASSEMBLECOLOR(_r, _g, _b) \ |
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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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#include "gx_utility.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_canvas_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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/* Canvas blend function for 24xrgb color format. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* canvas The canvas to blend to */ |
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/* composite The canvas to blend from */ |
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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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/* _gx_utility_rectangle_shift Adjust the rectangle */ |
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/* _gx_utility_recttangle_overlap_detect Detect whether two areas */ |
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/* overlap */ |
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/* REDVAL Extrace Red from canvas */ |
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/* GREENVAL Extrace Green from canvas */ |
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/* BLUEVAL Extrace Blue from canvas */ |
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/* ASSEMBLECOLOR Compose the RGB color */ |
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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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VOID _gx_display_driver_24xrgb_canvas_blend(GX_CANVAS *canvas, GX_CANVAS *composite) |
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{ |
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GX_RECTANGLE dirty; |
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GX_RECTANGLE overlap; |
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ULONG *read; |
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ULONG *read_start; |
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ULONG *write; |
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ULONG *write_start; |
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ULONG fcolor; |
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GX_UBYTE fred, fgreen, fblue; |
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GX_UBYTE bred, bgreen, bblue; |
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GX_UBYTE alpha, balpha; |
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ULONG bcolor; |
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INT row; |
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INT col; |
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dirty.gx_rectangle_left = dirty.gx_rectangle_top = 0; |
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dirty.gx_rectangle_right = (GX_VALUE)(canvas -> gx_canvas_x_resolution - 1); |
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dirty.gx_rectangle_bottom = (GX_VALUE)(canvas -> gx_canvas_y_resolution - 1); |
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_gx_utility_rectangle_shift(&dirty, canvas -> gx_canvas_display_offset_x, canvas -> gx_canvas_display_offset_y); |
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✓✓ |
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if (_gx_utility_rectangle_overlap_detect(&dirty, &composite -> gx_canvas_dirty_area, &overlap)) |
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{ |
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alpha = canvas -> gx_canvas_alpha; |
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balpha = (GX_UBYTE)(256 - alpha); |
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read_start = (ULONG *)canvas -> gx_canvas_memory; |
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/* index into starting row */ |
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read_start += (overlap.gx_rectangle_top - dirty.gx_rectangle_top) * canvas -> gx_canvas_x_resolution; |
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/* index into pixel */ |
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read_start += overlap.gx_rectangle_left - dirty.gx_rectangle_left; |
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/* calculate the write pointer */ |
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write_start = (ULONG *)composite -> gx_canvas_memory; |
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write_start += overlap.gx_rectangle_top * composite -> gx_canvas_x_resolution; |
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write_start += overlap.gx_rectangle_left; |
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✓✓ |
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for (row = overlap.gx_rectangle_top; row <= overlap.gx_rectangle_bottom; row++) |
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{ |
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read = read_start; |
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write = write_start; |
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✓✓ |
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for (col = overlap.gx_rectangle_left; col <= overlap.gx_rectangle_right; col++) |
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{ |
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/* read the foreground color */ |
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fcolor = *read++; |
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/* split foreground into red, green, and blue components */ |
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fred = REDVAL(fcolor); |
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fgreen = GREENVAL(fcolor); |
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fblue = BLUEVAL(fcolor); |
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/* read background color */ |
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bcolor = *write; |
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/* split background color into red, green, and blue components */ |
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bred = REDVAL(bcolor); |
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bgreen = GREENVAL(bcolor); |
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bblue = BLUEVAL(bcolor); |
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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 16-bit color and write it out */ |
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*write++ = ASSEMBLECOLOR((ULONG)fred, (ULONG)fgreen, (ULONG)fblue); |
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} |
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write_start += composite -> gx_canvas_x_resolution; |
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read_start += canvas -> gx_canvas_x_resolution; |
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} |
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} |
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} |
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