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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 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_context.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_8bpp_pixelmap_raw_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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/* Internal helper function that handles blending of uncompressed */ |
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/* pixlemap file. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* context Drawing context */ |
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/* xpos x-coord of top-left draw point*/ |
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/* ypos y-coord of top-left draw point*/ |
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/* pixelmap Pointer to GX_PIXELMAP struct */ |
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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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/* [gx_display_driver_pixel_blend] Basic display driver pixel */ |
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/* blend function */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_display_driver_8bpp_pixelmap_blend */ |
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/* */ |
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/**************************************************************************/ |
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static VOID _gx_display_driver_8bpp_pixelmap_raw_blend(GX_DRAW_CONTEXT *context, |
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INT xpos, INT ypos, GX_PIXELMAP *pixelmap, GX_UBYTE alpha) |
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{ |
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INT xval; |
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INT yval; |
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GX_UBYTE *get; |
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GX_UBYTE *getrow; |
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GX_UBYTE pixel; |
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GX_RECTANGLE *clip = context -> gx_draw_context_clip; |
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VOID (*blend_func)(GX_DRAW_CONTEXT *context, INT x, INT y, GX_COLOR fcolor, GX_UBYTE alpha); |
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blend_func = context -> gx_draw_context_display -> gx_display_driver_pixel_blend; |
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✓✓ |
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if (!blend_func) |
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{ |
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return; |
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} |
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getrow = (GX_UBYTE *)(pixelmap -> gx_pixelmap_data + (INT)sizeof(GX_UBYTE) * pixelmap -> gx_pixelmap_width * (clip -> gx_rectangle_top - ypos)); |
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getrow += (clip -> gx_rectangle_left - xpos); |
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✓✓ |
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for (yval = clip -> gx_rectangle_top; yval <= clip -> gx_rectangle_bottom; yval++) |
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{ |
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get = getrow; |
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✓✓ |
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for (xval = clip -> gx_rectangle_left; xval <= clip -> gx_rectangle_right; xval++) |
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{ |
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pixel = *get++; |
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blend_func(context, xval, yval, pixel, alpha); |
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} |
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getrow += pixelmap -> gx_pixelmap_width; |
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} |
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} |
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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_8bpp_pixelmap_alpha_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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/* Internal helper function that handles blending of uncompressed */ |
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/* pixelmap file with alpha channel. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* context Drawing context */ |
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/* xpos x-coord of top-left draw point*/ |
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/* ypos y-coord of top-left draw point*/ |
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/* pixelmap Pointer to GX_PIXELMAP struct */ |
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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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/* [gx_display_driver_pixel_blend] Basic display driver pixel */ |
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/* blend function */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_display_driver_8bpp_pixelmap_blend */ |
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/* */ |
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/**************************************************************************/ |
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static VOID _gx_display_driver_8bpp_pixelmap_alpha_blend(GX_DRAW_CONTEXT *context, |
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INT xpos, INT ypos, GX_PIXELMAP *pixelmap, GX_UBYTE alpha) |
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{ |
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INT skipcount; |
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INT xval; |
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INT yval; |
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GX_UBYTE *getrow; |
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GX_UBYTE *getrowalpha; |
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GX_UBYTE *get; |
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GX_UBYTE pixel; |
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GX_UBYTE *getalpha; |
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INT combined_alpha; |
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GX_UBYTE internal_alpha; |
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VOID (*blend_func)(GX_DRAW_CONTEXT *context, INT x, INT y, GX_COLOR fcolor, GX_UBYTE alpha); |
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GX_RECTANGLE *clip = context -> gx_draw_context_clip; |
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blend_func = context -> gx_draw_context_display -> gx_display_driver_pixel_blend; |
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✓✓ |
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if (GX_NULL == blend_func) |
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{ |
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return; |
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} |
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/* calculate how many pixels to skip */ |
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skipcount = (pixelmap -> gx_pixelmap_width) * (clip -> gx_rectangle_top - ypos); |
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skipcount += (clip -> gx_rectangle_left - xpos); |
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getrow = (GX_UBYTE *)(pixelmap -> gx_pixelmap_data); |
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getrow += skipcount; |
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getrowalpha = (GX_UBYTE *)(pixelmap -> gx_pixelmap_aux_data); |
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getrowalpha += skipcount; |
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✓✓ |
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for (yval = clip -> gx_rectangle_top; yval <= clip -> gx_rectangle_bottom; yval++) |
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{ |
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get = getrow; |
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getalpha = getrowalpha; |
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✓✓ |
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for (xval = clip -> gx_rectangle_left; xval <= clip -> gx_rectangle_right; xval++) |
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{ |
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internal_alpha = *getalpha++; |
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✓✓ |
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if (internal_alpha) |
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{ |
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combined_alpha = internal_alpha * alpha; |
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combined_alpha /= 255; |
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pixel = *get; |
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blend_func(context, xval, yval, pixel, (GX_UBYTE)combined_alpha); |
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} |
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get++; |
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} |
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getrow += pixelmap -> gx_pixelmap_width; |
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getrowalpha += pixelmap -> gx_pixelmap_width; |
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} |
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} |
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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_8bpp_pixelmap_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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/* Driver entry point for pixelmap blending function that handles */ |
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/* compressed or uncompress, with or without alpha channel. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* context Drawing context */ |
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/* xpos x-coord of top-left draw point*/ |
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/* ypos y-coord of top-left draw point*/ |
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/* pixelmap Pointer to GX_PIXELMAP struct */ |
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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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/* _gx_display_driver_8bpp_pixelmap_alpha_blend */ |
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/* Real display driver pixelmap */ |
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/* blend function for 8bpp */ |
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/* _gx_display_driver_8bpp_pixelmap_raw_blend */ |
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/* Real display driver pixelmap */ |
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/* blend function for 8bpp */ |
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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_8bpp_pixelmap_blend(GX_DRAW_CONTEXT *context, |
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INT xpos, INT ypos, GX_PIXELMAP *pixelmap, GX_UBYTE alpha) |
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{ |
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✓✓✓✓
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if ((pixelmap -> gx_pixelmap_flags & GX_PIXELMAP_TRANSPARENT) || (pixelmap -> gx_pixelmap_flags & GX_PIXELMAP_COMPRESSED)) |
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{ |
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/* Wrong format. */ |
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return; |
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} |
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✓✓ |
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if (pixelmap -> gx_pixelmap_format != GX_COLOR_FORMAT_8BIT_PACKED_PIXEL) |
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{ |
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/* wrong color format for this driver */ |
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return; |
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} |
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✓✓ |
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if (pixelmap -> gx_pixelmap_flags & GX_PIXELMAP_ALPHA) |
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{ |
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/* alpha, no compression */ |
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_gx_display_driver_8bpp_pixelmap_alpha_blend(context, |
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xpos, ypos, pixelmap, alpha); |
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} |
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else |
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{ |
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/* no compression or alpha */ |
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_gx_display_driver_8bpp_pixelmap_raw_blend(context, |
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xpos, ypos, pixelmap, alpha); |
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} |
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} |
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