Import Upstream version 1.2.0.svn250

src/screen.c

@@ -0,0 +1,101 @@
+/*
+    This file is part of g15tools.
+
+    g15tools is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    g15tools is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with g15lcd; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "libg15render.h"
+
+/**
+ * Retrieves the value of the pixel at (x, y)
+ * 
+ * \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
+ * \param x X offset for pixel to be retrieved.
+ * \param y Y offset for pixel to be retrieved.
+ */
+int
+g15r_getPixel (g15canvas * canvas, unsigned int x, unsigned int y)
+{
+  if (x >= G15_LCD_WIDTH || y >= G15_LCD_HEIGHT)
+    return 0;
+
+  unsigned int pixel_offset = y * G15_LCD_WIDTH + x;
+  unsigned int byte_offset = pixel_offset / BYTE_SIZE;
+  unsigned int bit_offset = 7 - (pixel_offset % BYTE_SIZE);
+
+  return (canvas->buffer[byte_offset] & (1 << bit_offset)) >> bit_offset;
+}
+
+/**
+ * Sets the value of the pixel at (x, y)
+ * 
+ * \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
+ * \param x X offset for pixel to be set.
+ * \param y Y offset for pixel to be set.
+ * \param val Value to which pixel should be set.
+ */
+void
+g15r_setPixel (g15canvas * canvas, unsigned int x, unsigned int y, int val)
+{
+  if (x >= G15_LCD_WIDTH || y >= G15_LCD_HEIGHT)
+    return;
+
+  unsigned int pixel_offset = y * G15_LCD_WIDTH + x;
+  unsigned int byte_offset = pixel_offset / BYTE_SIZE;
+  unsigned int bit_offset = 7 - (pixel_offset % BYTE_SIZE);
+
+  if (canvas->mode_xor)
+    val ^= g15r_getPixel (canvas, x, y);
+  if (canvas->mode_reverse)
+    val = !val;
+
+  if (val)
+    canvas->buffer[byte_offset] =
+      canvas->buffer[byte_offset] | 1 << bit_offset;
+  else
+    canvas->buffer[byte_offset] =
+      canvas->buffer[byte_offset] & ~(1 << bit_offset);
+
+}
+
+/**
+ * Clears the screen and fills it with pixels of color
+ * 
+ * \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
+ * \param color Screen will be filled with this color.
+ */
+void
+g15r_clearScreen (g15canvas * canvas, int color)
+{
+  memset (canvas->buffer, (color ? 0xFF : 0), G15_BUFFER_LEN);
+}
+
+/**
+ * Clears the screen and resets the mode values for a canvas
+ * 
+ * \param canvas A pointer to a g15canvas struct
+ */
+void
+g15r_initCanvas (g15canvas * canvas)
+{
+  memset (canvas->buffer, 0, G15_BUFFER_LEN);
+  canvas->mode_cache = 0;
+  canvas->mode_reverse = 0;
+  canvas->mode_xor = 0;
+#ifdef TTF_SUPPORT
+  if (FT_Init_FreeType (&canvas->ftLib))
+    printf ("Freetype couldnt initialise\n");
+#endif
+}