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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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/** Canvas Management (Canvas) */ |
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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_system.h" |
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#include "gx_utility.h" |
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#include "gx_display.h" |
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#include "gx_canvas.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_canvas_pixel_draw 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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/* This function prepares to draw one pixel using current context */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* position x,y coordinate to draw */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_utility_rectangle_point_detect Detect whether a pixel is */ |
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/* inside rectangle */ |
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/* [gx_display_driver_pixel_write] Actually write to canvas */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* _gx_widget_border_draw */ |
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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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9258517 |
UINT _gx_canvas_pixel_draw(GX_POINT position) |
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{ |
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GX_DRAW_CONTEXT *context; |
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GX_DISPLAY *display; |
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GX_VIEW *view; |
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GX_COLOR pixcolor; |
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GX_UBYTE brush_alpha; |
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/* pick up the current drawing context */ |
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9258517 |
context = _gx_system_current_draw_context; |
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/* test to see if we can draw at this position */ |
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✓✓ |
9258517 |
if (!_gx_utility_rectangle_point_detect(&context -> gx_draw_context_dirty, position)) |
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{ |
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/* nothing to draw, return */ |
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691583 |
return GX_SUCCESS; |
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} |
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/* pick up current display driver */ |
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8566934 |
display = context -> gx_draw_context_display; |
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brush_alpha = context -> gx_draw_context_brush.gx_brush_alpha; |
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/* pick up the pixel color */ |
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pixcolor = context -> gx_draw_context_brush.gx_brush_line_color; |
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/* test to determine if any viewport of the caller overlaps this pixel. |
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For each view that overlaps the bounding rectangle, do some drawing. |
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*/ |
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view = context -> gx_draw_context_view_head; |
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#if defined(GX_BRUSH_ALPHA_SUPPORT) |
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✓✓ |
8566934 |
if (brush_alpha == 0) |
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{ |
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return GX_SUCCESS; |
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} |
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✓✓ |
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while (view) |
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{ |
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✓✓ |
8654166 |
if (_gx_utility_rectangle_point_detect(&view -> gx_view_rectangle, position)) |
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{ |
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✓✓ |
8518483 |
if (brush_alpha == 0xff) |
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{ |
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✓✓ |
8112270 |
if (display -> gx_display_driver_pixel_write) |
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{ |
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display -> gx_display_driver_pixel_write(context, position.gx_point_x, position.gx_point_y, pixcolor); |
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} |
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} |
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else |
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{ |
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✓✓ |
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if (display -> gx_display_driver_pixel_blend) |
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{ |
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display -> gx_display_driver_pixel_blend(context, position.gx_point_x, position.gx_point_y, pixcolor, brush_alpha); |
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} |
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} |
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8518483 |
break; |
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} |
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view = view->gx_view_next; |
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} |
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#else |
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while (view) |
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{ |
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if (_gx_utility_rectangle_point_detect(&view -> gx_view_rectangle, position)) |
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{ |
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if (display -> gx_display_driver_pixel_write) |
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{ |
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display -> gx_display_driver_pixel_write(context, position.gx_point_x, position.gx_point_y, pixcolor); |
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} |
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break; |
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} |
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view = view->gx_view_next; |
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} |
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#endif |
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/* Return successful completion. */ |
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8557233 |
return(GX_SUCCESS); |
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} |
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