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Diffstat (limited to 'nx-X11/programs/Xserver/hw/nxagent/Pixels.c')
-rw-r--r--nx-X11/programs/Xserver/hw/nxagent/Pixels.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/nx-X11/programs/Xserver/hw/nxagent/Pixels.c b/nx-X11/programs/Xserver/hw/nxagent/Pixels.c
new file mode 100644
index 000000000..d3ab9dd2f
--- /dev/null
+++ b/nx-X11/programs/Xserver/hw/nxagent/Pixels.c
@@ -0,0 +1,384 @@
+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2011 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXAGENT, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of Medialogic S.p.A. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "Xmd.h"
+#include "Xlib.h"
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+
+#define PIXEL_ELEMENTS 256
+#define PIXEL_THRESHOLD 8
+#define PIXEL_STEP 7
+
+unsigned int Get16(const char *buffer, int order);
+unsigned int Get24(const char *buffer, int order);
+unsigned int Get32(const char *buffer, int order);
+
+void Put16(unsigned int value, char *buffer, int order);
+void Put24(unsigned int value, char *buffer, int order);
+void Put32(unsigned int value, char *buffer, int order);
+
+static int nxagentComparePixels(const void *p1, const void *p2)
+{
+ int pixel1 = *((int *) p1);
+ int pixel2 = *((int *) p2);
+
+ return (pixel1 < pixel2 ? -1 : (pixel1 == pixel2 ? 0 : 1));
+}
+
+int nxagentUniquePixels(XImage *image)
+{
+ int i = 0;
+
+ int pixels[PIXEL_ELEMENTS];
+
+ int elements = PIXEL_ELEMENTS;
+ int unique = 0;
+
+ int total;
+ int ratio;
+ int step;
+
+ int last = -1;
+
+ const char *next = image -> data;
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Image geometry [%d,%d] depth [%d] bits per pixel [%d].\n",
+ image -> width, image -> height, image -> depth, image -> bits_per_pixel);
+ #endif
+
+ /*
+ * Take at most 256 pixels from the image.
+ */
+
+ total = image -> width * image -> height;
+
+ step = total / elements;
+
+ if (step < PIXEL_STEP)
+ {
+ step = PIXEL_STEP;
+ }
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Step is [%d] with [%d] pixels and [%d] elements.\n",
+ step, total, elements);
+ #endif
+
+ /*
+ * Shift at the left after each scanline.
+ */
+
+ if (image -> bytes_per_line % step == 0)
+ {
+ step++;
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Increasing step to [%d] with [%d] bytes per line.\n",
+ step, image -> bytes_per_line);
+ #endif
+ }
+
+ elements = total / step;
+
+ if (elements > PIXEL_ELEMENTS)
+ {
+ elements = PIXEL_ELEMENTS;
+ }
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Step is now [%d] with [%d] elements.\n",
+ step, elements);
+ #endif
+
+ if (elements < PIXEL_THRESHOLD)
+ {
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Assuming ratio [100] with only [%d] elements.\n",
+ elements);
+ #endif
+
+ return 100;
+ }
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Scanning [%d] pixels out of [%d] with step [%d].\n",
+ elements, total, step);
+ #endif
+
+ /*
+ * Take one pixel every n from the image and
+ * add it to the array.
+ */
+
+ switch (image -> bits_per_pixel)
+ {
+ case 32:
+ {
+ for (i = 0; i < elements; i++)
+ {
+ pixels[i] = Get32(next, image -> byte_order);
+
+ next += (4 * step);
+
+ #ifdef DEBUG
+ fprintf(stderr, "nxagentUniquePixels: pixels[%d][0x%08x].\n",
+ i, pixels[i]);
+ #endif
+ }
+
+ break;
+ }
+ case 24:
+ {
+ for (i = 0; i < elements; i++)
+ {
+ pixels[i] = Get24(next, image -> byte_order);
+
+ next += (3 * step);
+
+ #ifdef DEBUG
+ fprintf(stderr, "nxagentUniquePixels: pixels[%d][0x%08x].\n",
+ i, pixels[i]);
+ #endif
+ }
+
+ break;
+ }
+ case 16:
+ case 15:
+ {
+ /*
+ * Note that the padding bytes at the end
+ * of the scanline are included in the set.
+ * This is not a big problem. What we want
+ * to find out is just how compressible is
+ * the image data.
+ */
+
+ for (i = 0; i < elements; i++)
+ {
+ pixels[i] = Get16(next, image -> byte_order);
+
+ next += (2 * step);
+
+ #ifdef DEBUG
+ fprintf(stderr, "nxagentUniquePixels: pixels[%d][0x%08x].\n",
+ i, pixels[i]);
+ #endif
+ }
+
+ break;
+ }
+ default:
+ {
+ #ifdef PANIC
+ fprintf(stderr, "nxagentUniquePixels: PANIC! Assuming ratio [100] with [%d] bits per pixel.\n",
+ image -> bits_per_pixel);
+ #endif
+
+ return 100;
+ }
+ }
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Sorting [%d] elements in the list.\n", i);
+ #endif
+
+ qsort(pixels, elements, sizeof(int), nxagentComparePixels);
+
+ for (i = 0; i < elements; i++)
+ {
+ if (last != pixels[i])
+ {
+ unique++;
+
+ last = pixels[i];
+ }
+
+ #ifdef DEBUG
+ fprintf(stderr, "nxagentUniquePixels: pixels[%d][0x%08x].\n",
+ i, pixels[i]);
+ #endif
+ }
+
+ ratio = unique * 100 / elements;
+
+ #ifdef TEST
+ fprintf(stderr, "nxagentUniquePixels: Found [%d] unique pixels out of [%d] with ratio [%d%%].\n",
+ unique, elements, ratio);
+ #endif
+
+ return ratio;
+}
+
+unsigned int Get16(const char *buffer, int order)
+{
+ unsigned int result;
+
+ if (order == MSBFirst)
+ {
+ result = *buffer;
+
+ result <<= 8;
+
+ result += buffer[1];
+ }
+ else
+ {
+ result = buffer[1];
+
+ result <<= 8;
+
+ result += *buffer;
+ }
+
+ return result;
+}
+
+unsigned int Get24(const char *buffer, int order)
+{
+ int i;
+
+ const char *next = (order == MSBFirst ? buffer : buffer + 2);
+
+ unsigned int result = 0;
+
+ for (i = 0; i < 3; i++)
+ {
+ result <<= 8;
+
+ result += *next;
+
+ if (order == MSBFirst)
+ {
+ next++;
+ }
+ else
+ {
+ next--;
+ }
+ }
+
+ return result;
+}
+
+unsigned int Get32(const char *buffer, int order)
+{
+ int i;
+
+ const char *next = (order == MSBFirst ? buffer : buffer + 3);
+
+ unsigned int result = 0;
+
+ for (i = 0; i < 4; i++)
+ {
+ result <<= 8;
+
+ result += *next;
+
+ if (order == MSBFirst)
+ {
+ next++;
+ }
+ else
+ {
+ next--;
+ }
+ }
+
+ return result;
+}
+
+void Put16(unsigned int value, char *buffer, int order)
+{
+ if (order == MSBFirst)
+ {
+ buffer[1] = (unsigned char) (value & 0xff);
+
+ value >>= 8;
+
+ *buffer = (unsigned char) value;
+ }
+ else
+ {
+ *buffer = (unsigned char) (value & 0xff);
+
+ value >>= 8;
+
+ buffer[1] = (unsigned char) value;
+ }
+}
+
+void Put24(unsigned int value, char *buffer, int order)
+{
+ int i;
+
+ if (order == MSBFirst)
+ {
+ buffer += 2;
+
+ for (i = 3; i > 0; i--)
+ {
+ *buffer-- = (unsigned char) (value & 0xff);
+
+ value >>= 8;
+ }
+ }
+ else
+ {
+ for (i = 3; i > 0; i--)
+ {
+ *buffer++ = (unsigned char) (value & 0xff);
+
+ value >>= 8;
+ }
+ }
+}
+
+void Put32(unsigned int value, char *buffer, int order)
+{
+ int i;
+
+ if (order == MSBFirst)
+ {
+ buffer += 3;
+
+ for (i = 4; i > 0; i--)
+ {
+ *buffer-- = (unsigned char) (value & 0xff);
+
+ value >>= 8;
+ }
+ }
+ else
+ {
+ for (i = 4; i > 0; i--)
+ {
+ *buffer++ = (unsigned char) (value & 0xff);
+
+ value >>= 8;
+ }
+ }
+}
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