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79 lines
3.6 KiB
C
79 lines
3.6 KiB
C
/*****************************************************************************/
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/* */
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/* pen.h */
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/* */
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/* Lightpen API */
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/* */
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/* */
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/* This software is provided "as-is", without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated, but is not required. */
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/* 2. Altered source versions must be marked plainly as such; and, must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef _PEN_H
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#define _PEN_H
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/*****************************************************************************/
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/* Declarations */
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/*****************************************************************************/
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/* A program optionally can set this pointer to a function that gives
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** a calibration value to a driver. If this pointer isn't NULL,
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** then a driver that wants a value can call that function.
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** pen_adjuster must be set before the driver is installed.
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*/
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extern void __fastcall__ (*pen_adjuster) (unsigned char *pValue);
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/*****************************************************************************/
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/* Functions */
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/*****************************************************************************/
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void __fastcall__ pen_calibrate (unsigned char *XOffset);
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/* Ask the user to help to calibrate a lightpen. Changes the screen!
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** A pointer to this function can be put into pen_adjuster.
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*/
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void __fastcall__ pen_adjust (const char *filename);
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/* Get a lightpen calibration value from a file if it exists. Otherwise, call
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** pen_calibrate() to create a value; then, write it into a file, so that it
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** will be available at the next time that the lightpen is used.
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** Might change the screen.
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** pen_adjust() is optional; if you want to use its feature,
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** then it must be called before a driver is installed.
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** Note: This function merely saves the file-name pointer, and sets
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** the pen_adjuster pointer. The file will be read only when a driver
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** is installed, and only if that driver wants to be calibrated.
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*/
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/* End of pen.h */
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#endif
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