Graphics private header.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@488 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/gfx/gfx_p.h b/gfx/gfx_p.h
new file mode 100755 (executable)
index 0000000..5afc26e
--- /dev/null
+++ b/gfx/gfx_p.h
@@ -0,0 +1,92 @@
+/*!
+ * \file
+ * <!--
+ * Copyright 2003, 2004, 2005, 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 1999 Bernardo Innocenti <bernie@develer.com>
+ * This file is part of DevLib - See README.devlib for information.
+ * -->
+ *
+ * \version $Id$
+ *
+ * \author Bernardo Innocenti <bernie@develer.com>
+ *
+ * \brief Graphics private header.
+ */
+
+/*#*
+ *#* $Log$
+ *#* Revision 1.1  2006/01/26 00:32:49  bernie
+ *#* Graphics private header.
+ *#*
+ *#*/
+
+#ifndef GFX_GFX_P_H
+#define GFX_GFX_P_H
+
+/**
+ * \name Known pixel formats for bitmap representation.
+ * \{
+ */
+#define BITMAP_FMT_PLANAR_H_MSB  1  /**< Planar pixels, horizontal bytes, MSB left. */
+#define BITMAP_FMT_PLANAR_V_LSB  2  /**< Planar pixels, vertical bytes, LSB top. */
+/* \} */
+
+#if CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_H_MSB
+
+       #define BM_ADDR(bm, x, y)  ((bm)->raster + (y) * (bm)->stride + ((x) / 8))
+       #define BM_MASK(bm, x, y)  (1 << (7 - (x) % 8))
+
+#elif CONFIG_BITMAP_FMT == BITMAP_FMT_PLANAR_V_LSB
+
+       #define BM_ADDR(bm, x, y)  ((bm)->raster + ((y) / 8) * (bm)->stride + (x))
+       #define BM_MASK(bm, x, y)  (1 << ((y) % 8))
+
+#else
+       #error Unknown value of CONFIG_BITMAP_FMT
+#endif /* CONFIG_BITMAP_FMT */
+
+/*!
+ * Plot a pixel in bitmap \a bm.
+ *
+ * \note bm is evaluated twice.
+ * \see BM_CLEAR BM_DRAWPIXEL
+ */
+#define BM_PLOT(bm, x, y) \
+       ( *BM_ADDR(bm, x, y) |= BM_MASK(bm, x, y) )
+
+/*!
+ * Clear a pixel in bitmap \a bm.
+ *
+ * \note bm is evaluated twice.
+ * \see BM_PLOT BM_DRAWPIXEL
+ */
+#define BM_CLEAR(bm, x, y) \
+       ( *BM_ADDR(bm, x, y) &= ~BM_MASK(bm, x, y) )
+
+/*!
+ * Set a pixel in bitmap \a bm to the specified color.
+ *
+ * \note bm is evaluated twice.
+ * \note This macro is somewhat slower than BM_PLOT and BM_CLEAR.
+ * \see BM_PLOT BM_CLEAR
+ */
+#define BM_DRAWPIXEL(bm, x, y, fg_pen) \
+       do { \
+               uint8_t *p = BM_ADDR(bm, x, y); \
+               uint8_t mask = BM_MASK(bm, x, y); \
+               *p = (*p & ~mask) | ((fg_pen) ? mask : 0); \
+       } while (0)
+
+/*!
+ * Get the value of the pixel in bitmap \a bm.
+ *
+ * \return The returned value is either 0 or 1.
+ *
+ * \note bm is evaluated twice.
+ * \see BM_DRAWPIXEL
+ */
+#define BM_READPIXEL(bm, x, y) \
+       ( *BM_ADDR(bm, x, y) & BM_MASK(bm, x, y) ? 1 : 0 )
+
+
+#endif /* GFX_GFX_P_H */