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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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/** Screen Management (Screen) */ |
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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_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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/* This function prepares to blend the specified pixelmap with */ |
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/* background at the requested position. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* x_position Top-left x-coord to place */ |
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/* pixelmap */ |
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/* y_position Top-left y-coord to place */ |
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/* pixelmap */ |
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/* pixelmap Pointer to actual pixelmap */ |
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/* to draw */ |
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/* alpha blending value 0-255 */ |
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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_define Define a rectangle */ |
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/* _gx_utility_rectangle_overlap_detect Detect rectangle overlap */ |
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/* [gx_display_driver_pixelmap_draw] Driver level pixelmap blend */ |
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/* function */ |
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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_sprite_draw */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_canvas_pixelmap_blend(GX_VALUE x_position, GX_VALUE y_position, |
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GX_PIXELMAP *pixelmap, GX_UBYTE alpha) |
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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 clip_rect; |
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GX_RECTANGLE bound; |
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GX_VIEW *view; |
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GX_UBYTE old_alpha; |
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VOID (*pmp_function)(GX_DRAW_CONTEXT *, INT, INT, GX_PIXELMAP *); |
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✓✓ |
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if (alpha == 0) |
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{ |
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return GX_SUCCESS; |
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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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/* calculate rectangle that bounds the pixelmap */ |
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_gx_utility_rectangle_define(&bound, x_position, y_position, |
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(GX_VALUE)(x_position + pixelmap -> gx_pixelmap_width - 1), |
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(GX_VALUE)(y_position + pixelmap -> gx_pixelmap_height - 1)); |
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/* clip the line 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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/* pickup pointer to correct pixelmap blending function */ |
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✓✓ |
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if (pixelmap -> gx_pixelmap_format == GX_COLOR_FORMAT_8BIT_ALPHAMAP) |
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{ |
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pmp_function = display -> gx_display_driver_alphamap_draw; |
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} |
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else |
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{ |
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pmp_function = display -> gx_display_driver_pixelmap_draw; |
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} |
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✓✓ |
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if (pmp_function == GX_NULL) |
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{ |
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return GX_NOT_SUPPORTED; |
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} |
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/* Set the parameter alpha to brush alpha value. */ |
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old_alpha = context -> gx_draw_context_brush.gx_brush_alpha; |
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context -> gx_draw_context_brush.gx_brush_alpha = alpha; |
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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 pixelmap, do it */ |
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/* first, set the context clip rectangle */ |
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context -> gx_draw_context_clip = &clip_rect; |
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/* now pass the context and drawing params to driver level function */ |
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pmp_function(context, x_position, y_position, pixelmap); |
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/* go to the next view */ |
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view = view -> gx_view_next; |
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} |
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context -> gx_draw_context_brush.gx_brush_alpha = old_alpha; |
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/* Return successful completion. */ |
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return(GX_SUCCESS); |
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} |
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