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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_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_arc_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 draws a circle arc into the currrent context. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* xcenter x-coord of center of circle */ |
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/* arc */ |
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/* ycenter y-coord of center of circle */ |
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/* arc */ |
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/* r Radius of circle arc */ |
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/* start_angle The start angle of circle arc */ |
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/* end_angle The end angle of circle arc */ |
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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_define */ |
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/* _gx_utility_rectangle_overlap_detect */ |
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/* _gx_display_driver_arc_draw */ |
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/* _gx_display_driver_anti_aliased_arc_draw */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application 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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#if defined(GX_ARC_DRAWING_SUPPORT) |
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UINT _gx_canvas_arc_draw(INT xcenter, INT ycenter, UINT r, INT start_angle, INT end_angle) |
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{ |
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GX_DRAW_CONTEXT *context; |
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GX_DISPLAY *display; |
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GX_RECTANGLE bound; |
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GX_RECTANGLE clip_rect; |
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GX_VIEW *view; |
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GX_BRUSH *brush; |
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UINT brush_width; |
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VOID (*outline_function)(GX_DRAW_CONTEXT *context, INT xcenter, INT ycenter, UINT r, INT start_angle, INT end_angle); |
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✓✓ |
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while (start_angle < 0) |
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{ |
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start_angle += 360; |
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} |
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✓✓ |
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while (end_angle < 0) |
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{ |
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end_angle += 360; |
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} |
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✓✓ |
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if (start_angle >= 360) |
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{ |
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start_angle %= 360; |
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} |
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✓✓ |
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if (end_angle >= 360) |
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{ |
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end_angle %= 360; |
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} |
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✓✓ |
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if (end_angle <= start_angle) |
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{ |
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end_angle += 360; |
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} |
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/* pick up the current drawing context */ |
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context = _gx_system_current_draw_context; |
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brush = &context -> gx_draw_context_brush; |
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brush_width = (UINT)((brush -> gx_brush_width + 1) >> 1); |
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_gx_utility_rectangle_define(&bound, (GX_VALUE)((UINT)xcenter - r - brush_width), (GX_VALUE)((UINT)ycenter - r - brush_width), |
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(GX_VALUE)((UINT)xcenter + r + brush_width), (GX_VALUE)((UINT)ycenter + r + brush_width)); |
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brush_width = (UINT)brush -> gx_brush_width; |
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/* clip the arc bounding box to the dirty rectangle */ |
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✓✓ |
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if (!_gx_utility_rectangle_overlap_detect(&bound, &context -> gx_draw_context_dirty, &bound)) |
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{ |
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/* nothing to draw, return */ |
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return GX_SUCCESS; |
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} |
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/* pick up current display driver */ |
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display = context -> gx_draw_context_display; |
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/* Default to no outline */ |
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outline_function = GX_NULL; |
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/* Determine which outline function to use.*/ |
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✓✓ |
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if (brush_width == 1) |
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{ |
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/* if anti-alias is requested and this is supported by display, use it */ |
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✓✓ |
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if ((brush -> gx_brush_style & GX_BRUSH_ALIAS) && |
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✓✓ |
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display -> gx_display_driver_anti_aliased_arc_draw != GX_NULL) |
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{ |
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outline_function = display -> gx_display_driver_anti_aliased_arc_draw; |
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} |
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else |
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{ |
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/* otherwise use non-aliased outline */ |
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outline_function = display -> gx_display_driver_arc_draw; |
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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 (brush_width > 1) |
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{ |
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/* if anti-alias is requested and this is supported by display, use it */ |
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✓✓ |
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if ((brush -> gx_brush_style & GX_BRUSH_ALIAS) && |
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✓✓ |
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display -> gx_display_driver_anti_aliased_wide_arc_draw) |
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{ |
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outline_function = display -> gx_display_driver_anti_aliased_wide_arc_draw; |
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} |
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else |
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{ |
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/* otherwise use non-aliased outline */ |
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outline_function = display -> gx_display_driver_wide_arc_draw; |
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} |
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} |
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} |
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/* test to determine if the bounding rectangle overlaps the region we are allowed to draw |
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into. 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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✓✓ |
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while (view) |
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{ |
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✓✓ |
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if (!_gx_utility_rectangle_overlap_detect(&view -> gx_view_rectangle, &bound, &clip_rect)) |
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{ |
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view = view -> gx_view_next; |
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continue; |
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} |
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/* we have a view into which we can draw the arc, do it */ |
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context -> gx_draw_context_clip = &clip_rect; |
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✓✓ |
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if (brush -> gx_brush_style & (GX_BRUSH_SOLID_FILL | GX_BRUSH_PIXELMAP_FILL)) |
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{ |
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display -> gx_display_driver_arc_fill(context, xcenter, ycenter, r, start_angle, end_angle); |
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} |
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✓✓ |
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if (outline_function) |
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{ |
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outline_function(context, xcenter, ycenter, r, start_angle, end_angle); |
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} |
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view = view -> gx_view_next; |
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} |
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/* Return successful completion. */ |
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return(GX_SUCCESS); |
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} |
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#endif |
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