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154 lines
5.6 KiB
154 lines
5.6 KiB
/* --COPYRIGHT--,BSD
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* Copyright (c) 2013, Texas Instruments Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of Texas Instruments Incorporated nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --/COPYRIGHT--*/
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#include "grlib.h"
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//*****************************************************************************
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//
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//! \addtogroup context_api
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//! @{
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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//! Initializes a drawing context.
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//!
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//! \param pContext is a pointer to the drawing context to initialize.
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//! \param pDisplay is a pointer to the tDisplayInfo structure that describes
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//! the display driver to use.
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//!
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//! This function initializes a drawing context, preparing it for use. The
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//! provided display driver will be used for all subsequent graphics
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//! operations, and the default clipping region will be set to the extent of
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//! the screen.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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GrContextInit(tContext *pContext, const tDisplay *pDisplay)
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{
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//
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// Check the arguments.
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//
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assert(pContext);
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assert(pDisplay);
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//
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// Set the size of the context.
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//
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pContext->lSize = sizeof(tContext);
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//
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// Save the pointer to the display.
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//
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pContext->pDisplay = pDisplay;
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//
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// Initialize the extent of the clipping region to the extents of the
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// screen.
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//
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pContext->sClipRegion.sXMin = 0;
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pContext->sClipRegion.sYMin = 0;
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pContext->sClipRegion.sXMax = pDisplay->usWidth - 1;
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pContext->sClipRegion.sYMax = pDisplay->usHeight - 1;
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//
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// Provide a default color and font.
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//
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pContext->ulForeground = 0;
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pContext->ulBackground = 0;
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pContext->pFont = 0;
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}
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//*****************************************************************************
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//
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//! Sets the extents of the clipping region.
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//!
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//! \param pContext is a pointer to the drawing context to use.
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//! \param pRect is a pointer to the structure containing the extents of the
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//! clipping region.
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//!
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//! This function sets the extents of the clipping region. The clipping region
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//! is not allowed to exceed the extents of the screen, but may be a portion of
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//! the screen.
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//!
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//! The supplied coordinate are inclusive; \e sXMin of 1 and \e sXMax of 1 will
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//! define a clipping region that will display only the pixels in the X = 1
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//! column. A consequence of this is that the clipping region must contain
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//! at least one row and one column.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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GrContextClipRegionSet(tContext *pContext, tRectangle *pRect)
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{
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unsigned long ulW, ulH;
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//
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// Check the arguments.
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//
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assert(pContext);
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assert(pRect);
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//
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// Get the width and height of the display.
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//
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ulW = DpyWidthGet(pContext->pDisplay);
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ulH = DpyHeightGet(pContext->pDisplay);
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//
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// Set the extents of the clipping region, forcing them to reside within
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// the extents of the screen.
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//
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pContext->sClipRegion.sXMin = ((pRect->sXMin < 0) ? 0 :
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((pRect->sXMin >= ulW) ? (ulW - 1) :
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pRect->sXMin));
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pContext->sClipRegion.sYMin = ((pRect->sYMin < 0) ? 0 :
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((pRect->sYMin >= ulH) ? (ulH - 1) :
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pRect->sYMin));
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pContext->sClipRegion.sXMax = ((pRect->sXMax < 0) ? 0 :
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((pRect->sXMax >= ulW) ? (ulW - 1) :
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pRect->sXMax));
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pContext->sClipRegion.sYMax = ((pRect->sYMax < 0) ? 0 :
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((pRect->sYMax >= ulH) ? (ulH - 1) :
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pRect->sYMax));
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}
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//*****************************************************************************
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//
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// Close the Doxygen group.
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//! @}
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//
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//*****************************************************************************
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