Add logic to load texture images from a graphic file

2 files changed, 384 insertions, 0 deletions

diff --git a/apps/graphics/traveler/src/trv_graphicfile.c b/apps/graphics/traveler/src/trv_graphicfile.c
new file mode 100644
index 000000000..4e598fd58
--- /dev/null
+++ b/apps/graphics/traveler/src/trv_graphicfile.c
@@ -0,0 +1,167 @@
+/*******************************************************************************
+ * apps/graphics/traveler/src/trv_graphicfile.c
+ * Load image from a graphic file
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included files
+ ****************************************************************************/
+
+#include "trv_types.h"
+#include "trv_mem.h"
+#include "trv_pcx.h"
+#include "trv_graphicfile.h"
+
+#include <stdio.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tvr_graphicfile_read
+ *
+ * Description:
+ *   Read a bitmap texture from a graphic file
+ *
+ *   NOTE:  This function exists only as extension pointer where additional
+ *   graphic file formats can be supported.  Currently only the ancient
+ *   PCX format is supported.
+ *
+ ***************************************************************************/
+
+FAR struct trv_graphicfile_s *tvr_graphicfile_read(char *filename)
+{
+  FAR struct trv_graphicfile_s *gfile = NULL;
+  FAR FILE *fp;
+
+  /* Open the graphic file for reading */
+
+  fp = fopen(filename, "rb");
+  if (fp == NULL)
+    {
+      int errcode = errno;
+      fprintf(stderr, "ERROR: Failed to open graphic file %s: %d\n",
+              filename, errcode);
+      return NULL;
+    }
+
+  /* Load the graphic file into memory.
+   *
+   * REVISIT: Here would be the place where we would decide on the format of
+   * the graphic file.  Here we just assume that the file is PCX.
+   */
+   
+  gfile = trv_load_pcx(fp, filename);
+  if (gfile == NULL)
+    {
+      fprintf(stderr, "ERROR: Failed to load graphic file %s\n", filename);
+    }
+
+  fclose(fp);
+  return gfile;
+}
+
+/*************************************************************************
+ * Name: trv_graphicfile_new
+ *
+ * Description:
+ *   Allocate a new graphic file structure
+ *
+ ************************************************************************/
+
+FAR struct trv_graphicfile_s *trv_graphicfile_new(void)
+{
+  FAR struct trv_graphicfile_s *gfile;
+
+
+  gfile = (FAR struct trv_graphicfile_s*)
+    trv_malloc(sizeof(struct trv_graphicfile_s));
+  if (gfile)
+    {
+      gfile->transparent_entry = -1;
+    }
+
+  return gfile;
+}
+
+/*************************************************************************
+ * Name: trv_graphicfile_free
+ *
+ * Description:
+ *   Free the graphic file structure after also freeing in additional
+ *   resources attached to the structure.
+ 
+ ************************************************************************/
+
+void trv_graphicfile_free(FAR struct trv_graphicfile_s *gfile)
+{
+  if (gfile != NULL)
+    {
+      if (gfile->palette != NULL)
+        {
+          trv_free(gfile->palette);
+        }
+
+      if (gfile->bitmap != NULL)
+        {
+          trv_free(gfile->bitmap);
+        }
+
+      trv_free(gfile);
+    }
+}
+
+/*************************************************************************
+ * Name: trv_graphicfile_pixel
+ *
+ * Description:
+ *   Return the RGB color value for a pixel at location (x,y) in the
+ *   texture bitmap.
+ *
+ ************************************************************************/
+
+struct trv_color_rgb_s
+trv_graphicfile_pixel(FAR struct trv_graphicfile_s *gfile, int x, int y)
+{
+  /* REVISIT:  This only works for paletted graphics files like PCX.
+   * For the paletted color, the color lookup values lies at the (x,y)
+   * position in the image.  For a true color image, the RGB value would
+   * lie at the (x,y) position,
+   */
+
+  int ndx = gfile->bitmap[y * gfile->width + x];
+  return gfile->palette[ndx];
+}
diff --git a/apps/graphics/traveler/src/trv_pcx.c b/apps/graphics/traveler/src/trv_pcx.c
new file mode 100644
index 000000000..5ff2d0cb7
--- /dev/null
+++ b/apps/graphics/traveler/src/trv_pcx.c
@@ -0,0 +1,217 @@
+/*******************************************************************************
+ * apps/graphics/traveler/src/trv_pcx.c
+ * PCX graphic file support
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included files
+ ****************************************************************************/
+
+#include "trv_types.h"
+#include "trv_mem.h"
+#include "trv_color.h"
+#include "trv_bitmaps.h"
+#include "trv_graphicfile.h"
+#include "trv_pcx.h"
+
+#include <stdio.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: trv_load_pcxheader
+ *
+ * Description:
+ *
+ ***************************************************************************/
+
+static void trv_load_pcxheader(FAR FILE *fp, struct pcx_header_s *header)
+{
+  FAR uint8_t *tmpbuffer;
+  int i;
+
+  /* Load the header */
+
+  tmpbuffer = (FAR uint8_t*)header;
+
+  for (i = 0; i < SIZEOF_PCX_HEADER; i++)
+    {
+      tmpbuffer[i] = getc(fp);
+    }
+}
+
+/****************************************************************************
+ * Name: trv_load_pcxdata
+ *
+ * Description:
+ *
+ ***************************************************************************/
+
+static void trv_load_pcxdata(FAR FILE *fp, int32_t imagesize,
+                             FAR uint8_t *imagebuffer)
+{
+  uint32_t count;
+  int16_t nbytes;
+  uint8_t data;
+
+  count = 0;
+  while(count <= imagesize)
+    {
+      /* Get the first piece of data */
+
+      data = getc(fp);
+
+      /* Is this a run length encoding? */
+
+      if ((data >= 192) /* && (data <= 255) */)
+        {
+          /* How many bytes in run? */
+
+          nbytes = data - 192;
+
+          /* Get the actual data for the run */
+
+          data  = getc(fp);
+
+          /* Replicate data in buffer nbytes times */
+
+          while(nbytes-- > 0)
+            {
+              imagebuffer[count++] = data;
+            }
+        }
+      else
+        {
+          /* Actual data, just copy it into buffer at next location */
+
+          imagebuffer[count++] = data;
+        }
+    }
+}
+
+/****************************************************************************
+ * Name: trv_load_pcxpalette
+ *
+ * Description:
+ *
+ ***************************************************************************/
+
+static void trv_load_pcxpalette(FAR FILE *fp,
+                                FAR struct trv_color_rgb_s *palette)
+{
+  int i;
+
+  /* Move to end of file then back up 768 bytes i.e. to beginning of palette */
+
+  (void)fseek(fp, -768L, SEEK_END);
+
+  /* Load the PCX palette into the palette structure */
+
+  for (i = 0; i < 256; i++)
+    {
+      /* Get the RGB components */
+
+      palette[i].red   = getc(fp);
+      palette[i].green = getc(fp);
+      palette[i].blue  = getc(fp);
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: trv_load_pcx
+ *
+ * Description:
+ *   This function loads a PCX file into a memory.
+ *
+ ***************************************************************************/
+
+FAR struct trv_graphicfile_s *trv_load_pcx(FAR FILE *fp,
+                                           FAR const char *filename)
+{
+  struct pcx_header_s header;
+  FAR trv_pixel_t *buffer;
+  FAR struct trv_graphicfile_s *gfile;
+  FAR struct trv_color_rgb_s *palette;
+  uint16_t imagewidth;
+  uint16_t imageheight;
+  uint32_t imagesize;
+
+  /* Load the PCX Header */
+
+  trv_load_pcxheader(fp, &header);
+
+  /* Allocate Space to hold the image data */
+
+  imagewidth  = header.width - header.x + 1;
+  imageheight = header.height - header.y + 1;
+  imagesize   = imageheight * imagewidth * sizeof(trv_pixel_t);
+  buffer      = (FAR trv_pixel_t*)trv_malloc(imagesize + 1);
+
+  /* Load the PCX data into the buffer */
+
+  trv_load_pcxdata(fp, imagesize, (FAR uint8_t*)buffer);
+
+  /* Allocate space to hold the PCX palette */
+
+  palette = (struct trv_color_rgb_s*)
+    trv_malloc(sizeof(struct trv_color_rgb_s) * 256);
+
+  gfile = NULL;
+  if (palette)
+    {
+      /* Load the PCX palette */
+
+      trv_load_pcxpalette(fp, palette);
+
+      /* Now save the resulting data in a struct trv_graphicfile_s structure */
+
+      gfile = trv_graphicfile_new();
+      if (gfile)
+        {
+          gfile->palette = palette;
+          gfile->width = imagewidth;
+          gfile->height = imageheight;
+          gfile->bitmap = buffer;
+        }
+    }
+
+  return gfile;
+}
+