diff options
| author | Yuval Adam <yuval@y3xz.com> | 2015-03-13 12:24:02 +0200 |
|---|---|---|
| committer | Yuval Adam <yuval@y3xz.com> | 2015-03-13 12:24:02 +0200 |
| commit | 788db64b8642bf31de6930d18a62177c64163ee0 (patch) | |
| tree | 38e8291d1fcfceac7ad2a393ad74396ed6453d24 /grlib/context.c | |
| parent | c686407d271989d5c4bcc1b3c4f5bb6fcd1846a8 (diff) | |
Add grlib, fixes #5
Diffstat (limited to 'grlib/context.c')
| -rw-r--r-- | grlib/context.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/grlib/context.c b/grlib/context.c new file mode 100644 index 0000000..11014b5 --- /dev/null +++ b/grlib/context.c @@ -0,0 +1,227 @@ +//*****************************************************************************
+//
+// context.c - Routines for handling drawing contexts.
+//
+// Copyright (c) 2007-2014 Texas Instruments Incorporated. All rights reserved.
+// Software License Agreement
+//
+// Texas Instruments (TI) is supplying this software for use solely and
+// exclusively on TI's microcontroller products. The software is owned by
+// TI and/or its suppliers, and is protected under applicable copyright
+// laws. You may not combine this software with "viral" open-source
+// software in order to form a larger program.
+//
+// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
+// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
+// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
+// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
+// DAMAGES, FOR ANY REASON WHATSOEVER.
+//
+// This is part of revision 2.1.0.12573 of the Tiva Graphics Library.
+//
+//*****************************************************************************
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "driverlib/debug.h"
+#include "grlib/grlib.h"
+
+//*****************************************************************************
+//
+//! \addtogroup primitives_api
+//! @{
+//
+//*****************************************************************************
+
+#ifndef GRLIB_REMOVE_WIDE_FONT_SUPPORT
+//*****************************************************************************
+//
+// A pointer to the application-passed structure containing default values for
+// various text rendering properties.
+//
+//*****************************************************************************
+static tGrLibDefaults const *g_psGrLibDefaults;
+
+//
+// Default text mapping functions. This table allows the use of 8 bit encoded
+// source text with either Unicode encoded wide fonts or legacy fonts
+// which are assumed to contain ISO8859-1 text (ASCII + western European).
+//
+const tCodePointMap g_psDefaultCodePointMapTable[] =
+{
+ {CODEPAGE_ISO8859_1, CODEPAGE_UNICODE, GrMapISO8859_1_Unicode},
+ {CODEPAGE_ISO8859_1, CODEPAGE_ISO8859_1, GrMapISO8859_1_Unicode}
+};
+
+#define NUM_DEFAULT_CODEPOINT_MAPS (sizeof(g_psDefaultCodePointMapTable) / \
+ sizeof(tCodePointMap))
+
+//*****************************************************************************
+//
+//! Initializes graphics library default text rendering values.
+//!
+//! \param pDefaults points to a structure containing default values to use.
+//!
+//! This function allows an application to set global default values that the
+//! graphics library will use when initializing any graphics context. These
+//! values set the source text codepage, the rendering function to use for
+//! strings and mapping functions used to allow extraction of the correct
+//! glyphs from fonts.
+//!
+//! If this function is not called by an application, the graphics library
+//! assumes that text strings are ISO8859-1 encoded and that the default string
+//! renderer is used.
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+GrLibInit(const tGrLibDefaults *pDefaults)
+{
+ ASSERT(pDefaults);
+
+ //
+ // Remember the pointer to the defaults structure.
+ //
+ g_psGrLibDefaults = pDefaults;
+}
+
+#endif
+
+//*****************************************************************************
+//
+//! Initializes a drawing context.
+//!
+//! \param psContext is a pointer to the drawing context to initialize.
+//! \param psDisplay is a pointer to the tDisplayInfo structure that describes
+//! the display driver to use.
+//!
+//! This function initializes a drawing context, preparing it for use. The
+//! provided display driver will be used for all subsequent graphics
+//! operations, and the default clipping region will be set to the extent of
+//! the screen.
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+GrContextInit(tContext *psContext, const tDisplay *psDisplay)
+{
+ //
+ // Check the arguments.
+ //
+ ASSERT(psContext);
+ ASSERT(psDisplay);
+
+ //
+ // Set the size of the context.
+ //
+ psContext->i32Size = sizeof(tContext);
+
+ //
+ // Save the pointer to the display.
+ //
+ psContext->psDisplay = psDisplay;
+
+ //
+ // Initialize the extent of the clipping region to the extents of the
+ // screen.
+ //
+ psContext->sClipRegion.i16XMin = 0;
+ psContext->sClipRegion.i16YMin = 0;
+ psContext->sClipRegion.i16XMax = psDisplay->ui16Width - 1;
+ psContext->sClipRegion.i16YMax = psDisplay->ui16Height - 1;
+
+ //
+ // Provide a default color and font.
+ //
+ psContext->ui32Foreground = 0;
+ psContext->ui32Background = 0;
+ psContext->psFont = 0;
+
+#ifndef GRLIB_REMOVE_WIDE_FONT_SUPPORT
+ //
+ // Set defaults for all text rendering options.
+ //
+ if(g_psGrLibDefaults)
+ {
+ psContext->pfnStringRenderer = g_psGrLibDefaults->pfnStringRenderer;
+ psContext->pCodePointMapTable = g_psGrLibDefaults->pCodePointMapTable;
+ psContext->ui16Codepage = g_psGrLibDefaults->ui16Codepage;
+ psContext->ui8NumCodePointMaps = g_psGrLibDefaults->ui8NumCodePointMaps;
+ psContext->ui8Reserved = g_psGrLibDefaults->ui8Reserved;
+ }
+ else
+ {
+ psContext->pfnStringRenderer = GrDefaultStringRenderer;
+ psContext->pCodePointMapTable = g_psDefaultCodePointMapTable;
+ psContext->ui16Codepage = CODEPAGE_ISO8859_1;
+ psContext->ui8NumCodePointMaps = NUM_DEFAULT_CODEPOINT_MAPS;
+ psContext->ui8Reserved = 0;
+ }
+ psContext->ui8CodePointMap = 0;
+#endif
+}
+
+//*****************************************************************************
+//
+//! Sets the extents of the clipping region.
+//!
+//! \param psContext is a pointer to the drawing context to use.
+//! \param pRect is a pointer to the structure containing the extents of the
+//! clipping region.
+//!
+//! This function sets the extents of the clipping region. The clipping region
+//! is not allowed to exceed the extents of the screen, but may be a portion of
+//! the screen.
+//!
+//! The supplied coordinate are inclusive; \e i16XMin of 1 and \e i16XMax of 1
+//! will define a clipping region that will display only the pixels in the
+//! X = 1 column. A consequence of this is that the clipping region must
+//! contain at least one row and one column.
+//!
+//! \return None.
+//
+//*****************************************************************************
+void
+GrContextClipRegionSet(tContext *psContext, tRectangle *pRect)
+{
+ uint32_t ui32W, ui32H;
+
+ //
+ // Check the arguments.
+ //
+ ASSERT(psContext);
+ ASSERT(pRect);
+
+ //
+ // Get the width and height of the display.
+ //
+ ui32W = DpyWidthGet(psContext->psDisplay);
+ ui32H = DpyHeightGet(psContext->psDisplay);
+
+ //
+ // Set the extents of the clipping region, forcing them to reside within
+ // the extents of the screen.
+ //
+ psContext->sClipRegion.i16XMin = ((pRect->i16XMin < 0) ? 0 :
+ ((pRect->i16XMin >= ui32W) ? (ui32W - 1) :
+ pRect->i16XMin));
+ psContext->sClipRegion.i16YMin = ((pRect->i16YMin < 0) ? 0 :
+ ((pRect->i16YMin >= ui32H) ? (ui32H - 1) :
+ pRect->i16YMin));
+ psContext->sClipRegion.i16XMax = ((pRect->i16XMax < 0) ? 0 :
+ ((pRect->i16XMax >= ui32W) ? (ui32W - 1) :
+ pRect->i16XMax));
+ psContext->sClipRegion.i16YMax = ((pRect->i16YMax < 0) ? 0 :
+ ((pRect->i16YMax >= ui32H) ? (ui32H - 1) :
+ pRect->i16YMax));
+}
+
+//*****************************************************************************
+//
+// Close the Doxygen group.
+//! @}
+//
+//*****************************************************************************
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