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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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/** 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_canvas.h" |
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#include "gx_display.h" |
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#include "gx_window.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_block_move.c PORTABLE C */ |
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/* 6.3.0 */ |
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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 copies a block of pixel from one reference position */ |
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/* to another. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* block Rectangle to move */ |
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/* x_shift Distance to move in x */ |
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/* direction */ |
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/* y_shift Distance to move in y */ |
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/* direction */ |
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/* dirty Flag of dirty block */ |
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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_inside_detect Detect if a second rectangle */ |
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/* is completely within the */ |
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/* first one */ |
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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_window_client_scroll */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_canvas_block_move(GX_RECTANGLE *block, GX_VALUE x_shift, GX_VALUE y_shift, GX_RECTANGLE *dirty) |
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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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UINT status = GX_FAILURE; |
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/* pick up the current drawing context */ |
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context = _gx_system_current_draw_context; |
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/* If the caller hasn't opened the canvas, we can't do anything */ |
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✓✓ |
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if (!context) |
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{ |
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return status; |
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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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/* check to see if this driver supports block move */ |
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✓✓✗✓
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if (!display -> gx_display_driver_block_move || (context -> gx_draw_context_canvas -> gx_canvas_status & GX_CANVAS_PARTIAL_FRAME_BUFFER)) |
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{ |
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/* this driver doesn't support block move. If we are |
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partial drawing just mark the caller as dirty so that |
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a normal redraw operation occurs. |
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*/ |
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return status; |
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} |
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/* test to determine if any viewport of the caller contains the block to move. |
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If yes, we can do the block move. If no, we have to |
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do a normal invalidation and redraw. |
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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_inside_detect(&view -> gx_view_rectangle, block)) |
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{ |
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context -> gx_draw_context_clip = block; |
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display -> gx_display_driver_block_move(context, block, x_shift, y_shift); |
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status = GX_SUCCESS; |
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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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✓✓✓✓
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if (status == GX_SUCCESS && dirty) |
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{ |
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/* we were able to aid drawing by doing a block move. Mark |
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the remainder that was not updated as dirty so that the |
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caller can redraw that portion |
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*/ |
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*dirty = *block; |
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✓✓ |
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if (x_shift) |
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{ |
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✓✓ |
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if (x_shift > 0) |
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{ |
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dirty -> gx_rectangle_right = (GX_VALUE)(dirty -> gx_rectangle_left + x_shift - 1); |
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} |
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else |
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{ |
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dirty -> gx_rectangle_left = (GX_VALUE)(dirty -> gx_rectangle_right + x_shift + 1); |
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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 (y_shift > 0) |
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{ |
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dirty -> gx_rectangle_bottom = (GX_VALUE)(dirty -> gx_rectangle_top + y_shift - 1); |
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} |
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else |
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{ |
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dirty -> gx_rectangle_top = (GX_VALUE)(dirty -> gx_rectangle_bottom + y_shift + 1); |
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} |
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} |
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} |
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return(status); |
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} |
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