X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=hacks%2Fximage-loader.c;fp=hacks%2Fximage-loader.c;h=f122e3790773768c4cc16959cedd41b9c8ad44f2;hp=0000000000000000000000000000000000000000;hb=78add6e627ee5f10e1fa6f3852602ea5066eee5a;hpb=39809ded547bdbb08207d3e514950425215b4410

diff --git a/hacks/ximage-loader.c b/hacks/ximage-loader.c
new file mode 100644
index 00000000..f122e379
--- /dev/null
+++ b/hacks/ximage-loader.c
@@ -0,0 +1,680 @@
+/* ximage-loader.c --- converts image files or data to XImages or Pixmap.
+ * xscreensaver, Copyright (c) 1998-2018 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef HAVE_JWXYZ
+# include "jwxyz.h"
+#else
+# include <X11/Xlib.h>
+# include <X11/Xutil.h>
+#endif
+
+#include "ximage-loader.h"
+
+#if defined(HAVE_GDK_PIXBUF) || defined(HAVE_COCOA) || defined(HAVE_ANDROID)
+# undef HAVE_LIBPNG
+#endif
+
+#ifdef HAVE_COCOA
+# include "grabscreen.h"  /* for osx_load_image_file() */
+#endif
+
+#ifdef HAVE_GDK_PIXBUF
+# include <gdk-pixbuf/gdk-pixbuf.h>
+# ifdef HAVE_GTK2
+#  include <gdk-pixbuf-xlib/gdk-pixbuf-xlib.h>
+# else  /* !HAVE_GTK2 */
+#  include <gdk-pixbuf/gdk-pixbuf-xlib.h>
+# endif /* !HAVE_GTK2 */
+#endif /* HAVE_GDK_PIXBUF */
+
+#ifdef HAVE_LIBPNG
+# include <png.h>
+#endif
+
+#ifdef HAVE_ANDROID
+ /* So that debug output shows up in logcat... */
+extern void Log(const char *format, ...);
+# undef  fprintf
+# define fprintf(S, ...) Log(__VA_ARGS__)
+#endif
+
+extern char *progname;
+
+static Bool
+bigendian (void)
+{
+  union { int i; char c[sizeof(int)]; } u;
+  u.i = 1;
+  return !u.c[0];
+}
+
+
+#ifdef HAVE_GDK_PIXBUF
+
+/* Loads the image to an XImage, RGBA -- GDK Pixbuf version.
+ */
+static XImage *
+make_ximage (Display *dpy, Visual *visual, const char *filename,
+             const unsigned char *image_data, unsigned long data_size)
+{
+  GdkPixbuf *pb;
+  static int initted = 0;
+# ifdef HAVE_GTK2
+  GError *gerr = NULL;
+# endif
+
+  if (!initted)
+    {
+# ifdef HAVE_GTK2
+#  if !GLIB_CHECK_VERSION(2, 36 ,0)
+      g_type_init ();
+#  endif
+# endif
+      gdk_pixbuf_xlib_init (dpy, DefaultScreen (dpy));
+      xlib_rgb_init (dpy, DefaultScreenOfDisplay (dpy));
+      initted = 1;
+    }
+
+  if (filename)
+    {
+# ifdef HAVE_GTK2
+      pb = gdk_pixbuf_new_from_file (filename, &gerr);
+      if (!pb)
+        {
+          fprintf (stderr, "%s: %s\n", progname, gerr->message);
+          return 0;
+        }
+# else
+      pb = gdk_pixbuf_new_from_file (filename);
+      if (!pb)
+        {
+          fprintf (stderr, "%s: GDK unable to load %s\n", progname, filename);
+          return 0;
+        }
+# endif /* HAVE_GTK2 */
+    }
+  else
+    {
+# ifdef HAVE_GTK2
+      GInputStream *s =
+        g_memory_input_stream_new_from_data (image_data, data_size, 0);
+      pb = gdk_pixbuf_new_from_stream (s, 0, &gerr);
+      /* #### free s? */
+      if (! pb)
+        {
+          fprintf (stderr, "%s: GDK unable to parse built-in image data\n",
+                   progname);
+          return 0;
+        }
+# else /* !HAVE_GTK2 */
+      fprintf (stderr, "%s: image loading not supported with GTK 1.x\n",
+               progname);
+      return 0;
+# endif /* !HAVE_GTK2 */
+    }
+
+  if (!pb) abort();
+
+  {
+    XImage *image;
+    int w = gdk_pixbuf_get_width (pb);
+    int h = gdk_pixbuf_get_height (pb);
+    guchar *row = gdk_pixbuf_get_pixels (pb);
+    int stride = gdk_pixbuf_get_rowstride (pb);
+    int chan = gdk_pixbuf_get_n_channels (pb);
+    int x, y;
+
+    image = XCreateImage (dpy, visual, 32, ZPixmap, 0, 0, w, h, 32, 0);
+    image->data = (char *) malloc(h * image->bytes_per_line);
+
+    /* Set the bit order in the XImage structure to whatever the
+       local host's native bit order is.
+    */
+    image->bitmap_bit_order =
+      image->byte_order =
+      (bigendian() ? MSBFirst : LSBFirst);
+
+    if (!image->data)
+      {
+        fprintf (stderr, "%s: out of memory (%d x %d)\n", progname, w, h);
+        return 0;
+      }
+
+    for (y = 0; y < h; y++)
+      {
+        guchar *i = row;
+        for (x = 0; x < w; x++)
+          {
+            unsigned long rgba = 0;
+            switch (chan) {
+            case 1:
+              rgba = ((0xFF << 24) |
+                      (*i   << 16) |
+                      (*i   <<  8) |
+                       *i);
+              i++;
+              break;
+            case 3:
+              rgba = ((0xFF << 24) |
+                      (i[2] << 16) |
+                      (i[1] <<  8) |
+                      i[0]);
+              i += 3;
+              break;
+            case 4:
+              rgba = ((i[3] << 24) |
+                      (i[2] << 16) |
+                      (i[1] <<  8) |
+                      i[0]);
+              i += 4;
+              break;
+            default:
+              abort();
+              break;
+            }
+            XPutPixel (image, x, y, rgba);
+          }
+        row += stride;
+      }
+
+    g_object_unref (pb);
+    return image;
+  }
+}
+
+#elif defined(HAVE_JWXYZ) /* MacOS, iOS or Android */
+
+/* Loads the image to an XImage, RGBA -- MacOS, iOS or Android version.
+ */
+static XImage *
+make_ximage (Display *dpy, Visual *visual, const char *filename,
+             const unsigned char *image_data, unsigned long data_size)
+{
+  XImage *ximage = 0;
+
+  if (filename)
+    {
+# ifdef HAVE_COCOA  /* MacOS */
+      XRectangle geom;
+      Screen *screen = DefaultScreenOfDisplay (dpy);
+      Window window = RootWindowOfScreen (screen);
+      XWindowAttributes xgwa;
+      XGetWindowAttributes (dpy, window, &xgwa);
+      Pixmap pixmap =
+        XCreatePixmap (dpy, window, xgwa.width, xgwa.height, xgwa.depth);
+      int x, y;
+
+      if (! osx_load_image_file (screen, window, pixmap, filename, &geom))
+        {
+          fprintf (stderr, "%s: %s failed\n", progname, filename);
+          return 0;
+        }
+
+      ximage = XGetImage (dpy, pixmap, geom.x, geom.y,
+                          geom.width, geom.height,
+                          ~0L, ZPixmap);
+      if (!ximage) abort();
+
+      /* Have to convert ABGR to RGBA */
+      for (y = 0; y < ximage->height; y++)
+        for (x = 0; x < ximage->width; x++)
+          {
+            unsigned long p = XGetPixel (ximage, x, y);
+            unsigned long a = (p >> 24) & 0xFF;
+            unsigned long b = (p >> 16) & 0xFF;
+            unsigned long g = (p >>  8) & 0xFF;
+            unsigned long r = (p >>  0) & 0xFF;
+            p = (r << 24) | (g << 16) | (b << 8) | (a << 0);
+            XPutPixel (ximage, x, y, p);
+          }
+
+      XFreePixmap (dpy, pixmap);
+
+# else   /* !HAVE_COCOA -- iOS or Android. */
+      fprintf (stderr, "%s: image file loading not supported\n", progname);
+      return 0;
+# endif  /* !HAVE_COCOA */
+    }
+  else
+    {
+      ximage = jwxyz_png_to_ximage (dpy, visual, image_data, data_size);
+    }
+
+  return ximage;
+}
+
+#elif defined(HAVE_LIBPNG)
+
+typedef struct {
+  const unsigned char *buf;
+  png_size_t siz, ptr;
+} png_read_closure;
+
+static void
+png_reader_fn (png_structp png_ptr, png_bytep buf, png_size_t siz)
+{
+  png_read_closure *r = png_get_io_ptr (png_ptr);
+  if (siz > r->siz - r->ptr)
+    png_error (png_ptr, "PNG internal read error");
+  memcpy (buf, r->buf + r->ptr, siz);
+  r->ptr += siz;
+}
+
+
+/* Loads the image to an XImage, RGBA -- libpng version.
+ */
+static XImage *
+make_ximage (Display *dpy, Visual *visual,
+             const char *filename, const unsigned char *image_data,
+             unsigned long data_size)
+{
+  XImage *image = 0;
+  png_structp png_ptr;
+  png_infop info_ptr;
+  png_infop end_info;
+  png_uint_32 width, height, channels;
+  int bit_depth, color_type, interlace_type;
+  FILE *fp = 0;
+
+  png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, 0, 0, 0);
+  if (!png_ptr) return 0;
+
+  info_ptr = png_create_info_struct (png_ptr);
+  if (!info_ptr)
+    {
+      png_destroy_read_struct (&png_ptr, 0, 0);
+      return 0;
+    }
+
+  end_info = png_create_info_struct (png_ptr);
+  if (!end_info)
+    {
+      png_destroy_read_struct (&png_ptr, &info_ptr, 0);
+      return 0;
+    }
+
+  if (setjmp (png_jmpbuf(png_ptr)))
+    {
+      png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);
+      return 0;
+    }
+
+  if (filename)
+    {
+      fp = fopen (filename, "r");
+      if (! fp)
+        {
+          fprintf (stderr, "%s: unable to read %s\n", progname, filename);
+          return 0;
+        }
+      png_init_io (png_ptr, fp);
+    }
+  else
+    {
+      png_read_closure closure;
+      closure.buf = image_data;
+      closure.siz = data_size;
+      closure.ptr = 0;
+      png_set_read_fn (png_ptr, (void *) &closure, png_reader_fn);
+    }
+
+  png_read_info (png_ptr, info_ptr);
+  png_get_IHDR (png_ptr, info_ptr,
+                &width, &height, &bit_depth, &color_type,
+                &interlace_type, 0, 0);
+
+  png_set_strip_16 (png_ptr);  /* Truncate 16 bits per component to 8 */
+  png_set_packing (png_ptr);   /* Unpack to 1 pixel per byte */
+
+# if 0
+  if (color_type == PNG_COLOR_TYPE_PALETTE)  /* Colormap to RGB */
+    png_set_palette_rgb (png_ptr);
+
+  if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)  /* Mono to 8bit */
+    png_set_gray_1_2_4_to_8 (png_ptr);
+# endif
+
+  if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS)) /* Fix weird alpha */
+    png_set_tRNS_to_alpha (png_ptr);
+
+  /* At least 8 bits deep */
+  if (color_type == PNG_COLOR_TYPE_PALETTE && bit_depth <= 8)
+    png_set_expand (png_ptr);
+
+   if (bit_depth == 8 &&          /* Convert RGB to RGBA */
+           (color_type == PNG_COLOR_TYPE_RGB ||
+            color_type == PNG_COLOR_TYPE_PALETTE))
+     png_set_filler (png_ptr, 0xFF, PNG_FILLER_AFTER);
+
+  /* Grayscale to color */
+  if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+    png_set_expand (png_ptr);
+
+
+  /* Convert graysale to color */
+  if (color_type == PNG_COLOR_TYPE_GRAY ||
+      color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+    png_set_gray_to_rgb (png_ptr);
+
+# if 0
+  {
+    png_color_16 *bg;
+    if (png_get_bKGD (png_ptr, info_ptr, &bg))
+      png_set_background (png_ptr, bg, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
+  }
+# endif
+
+  /* Commit */
+  png_read_update_info (png_ptr, info_ptr);
+
+  channels = png_get_channels (png_ptr, info_ptr);
+
+  {
+    png_bytep *rows = png_malloc (png_ptr, height * sizeof(*rows));
+    int x, y;
+    for (y = 0; y < height; y++)
+      rows[y] = png_malloc (png_ptr, png_get_rowbytes (png_ptr, info_ptr));
+    png_read_image (png_ptr, rows);
+    png_read_end (png_ptr, info_ptr);
+
+    image = XCreateImage (dpy, visual, 32, ZPixmap, 0, 0,
+                          width, height, 32, 0);
+    image->data = (char *) malloc (height * image->bytes_per_line);
+
+    /* Set the bit order in the XImage structure to whatever the
+       local host's native bit order is.
+     */
+    image->bitmap_bit_order =
+      image->byte_order =
+        (bigendian() ? MSBFirst : LSBFirst);
+
+    if (!image->data)
+      {
+        fprintf (stderr, "%s: out of memory (%lu x %lu)\n",
+                 progname, (unsigned long)width, (unsigned long)height);
+        return 0;
+      }
+
+    for (y = 0; y < height; y++)
+      {
+        png_bytep i = rows[y];
+        for (x = 0; x < width; x++)
+          {
+            unsigned long rgba;
+            switch (channels) {
+            case 4:
+              rgba = ((i[3] << 24) |
+                      (i[2] << 16) |
+                      (i[1] << 8)  |
+                       i[0]);
+              break;
+            case 3:
+              rgba = ((0xFF << 24) |
+                      (i[2] << 16) |
+                      (i[1] << 8)  |
+                       i[0]);
+              break;
+            case 2:
+              rgba = ((i[1] << 24) |
+                      (i[0] << 16) |
+                      (i[0] << 8)  |
+                       i[0]);
+              break;
+            case 1:
+              rgba = ((0xFF << 24) |
+                      (i[0] << 16) |
+                      (i[0] << 8)  |
+                       i[0]);
+              break;
+            default:
+              abort();
+            }
+            XPutPixel (image, x, y, rgba);
+            i += channels;
+          }
+        png_free (png_ptr, rows[y]);
+      }
+
+    png_free (png_ptr, rows);
+  }
+
+  png_destroy_read_struct (&png_ptr, &info_ptr, &end_info);  
+  if (fp) fclose (fp);
+
+  return image;
+}
+
+
+#else /* No image loaders! */
+
+static XImage *
+make_ximage (Display *dpy, Visual *visual,
+             const char *filename, const unsigned char *image_data,
+             unsigned long data_size)
+{
+  fprintf (stderr, "%s: no image loading support!\n", progname);
+  return 0;
+}
+
+#endif /* no loaders */
+
+
+/* Given a bitmask, returns the position and width of the field.
+ */
+static void
+decode_mask (unsigned long mask, unsigned long *pos_ret,
+             unsigned long *size_ret)
+{
+  int i;
+  for (i = 0; i < 32; i++)
+    if (mask & (1L << i))
+      {
+        int j = 0;
+        *pos_ret = i;
+        for (; i < 32; i++, j++)
+          if (! (mask & (1L << i)))
+            break;
+        *size_ret = j;
+        return;
+      }
+}
+
+
+/* Loads the image to a Pixmap and optional 1-bit mask.
+ */
+static Pixmap
+make_pixmap (Display *dpy, Window window,
+             const char *filename,
+             const unsigned char *image_data, unsigned long data_size,
+             int *width_ret, int *height_ret, Pixmap *mask_ret)
+{
+  XWindowAttributes xgwa;
+  XImage *in, *out, *mask = 0;
+  Pixmap pixmap;
+  XGCValues gcv;
+  GC gc;
+  int x, y;
+
+  unsigned long crpos=0, cgpos=0, cbpos=0, capos=0; /* bitfield positions */
+  unsigned long srpos=0, sgpos=0, sbpos=0;
+  unsigned long srmsk=0, sgmsk=0, sbmsk=0;
+  unsigned long srsiz=0, sgsiz=0, sbsiz=0;
+
+# ifdef HAVE_JWXYZ
+  // BlackPixel has alpha: 0xFF000000.
+  unsigned long black = BlackPixelOfScreen (DefaultScreenOfDisplay (dpy));
+#else
+  unsigned long black = 0;
+# endif
+
+  XGetWindowAttributes (dpy, window, &xgwa);
+
+  in = make_ximage (dpy, xgwa.visual, filename, image_data, data_size);
+  if (!in) return 0;
+
+  /* Create a new image in the depth and bit-order of the server. */
+  out = XCreateImage (dpy, xgwa.visual, xgwa.depth, ZPixmap, 0, 0,
+                      in->width, in->height, 8, 0);
+
+  out->bitmap_bit_order = in->bitmap_bit_order;
+  out->byte_order = in->byte_order;
+
+  out->bitmap_bit_order = BitmapBitOrder (dpy);
+  out->byte_order = ImageByteOrder (dpy);
+
+  out->data = (char *) malloc (out->height * out->bytes_per_line);
+  if (!out->data) abort();
+
+  if (mask_ret)
+    {
+      mask = XCreateImage (dpy, xgwa.visual, 1, XYPixmap, 0, 0,
+                           in->width, in->height, 8, 0);
+      mask->byte_order = in->byte_order;
+      mask->data = (char *) malloc (mask->height * mask->bytes_per_line);
+    }
+
+  /* Find the server's color masks.
+   */
+  srmsk = out->red_mask;
+  sgmsk = out->green_mask;
+  sbmsk = out->blue_mask;
+
+  if (!(srmsk && sgmsk && sbmsk)) abort();  /* No server color masks? */
+
+  decode_mask (srmsk, &srpos, &srsiz);
+  decode_mask (sgmsk, &sgpos, &sgsiz);
+  decode_mask (sbmsk, &sbpos, &sbsiz);
+
+  /* 'in' is RGBA in client endianness.  Convert to what the server wants. */
+  if (bigendian())
+    crpos = 24, cgpos = 16, cbpos =  8, capos =  0;
+  else
+    crpos =  0, cgpos =  8, cbpos = 16, capos = 24;
+
+  for (y = 0; y < in->height; y++)
+    for (x = 0; x < in->width; x++)
+      {
+        unsigned long p = XGetPixel (in, x, y);
+        unsigned char a = (p >> capos) & 0xFF;
+        unsigned char b = (p >> cbpos) & 0xFF;
+        unsigned char g = (p >> cgpos) & 0xFF;
+        unsigned char r = (p >> crpos) & 0xFF;
+        XPutPixel (out, x, y, ((r << srpos) |
+                               (g << sgpos) |
+                               (b << sbpos) |
+                               black));
+        if (mask)
+          XPutPixel (mask, x, y, (a ? 1 : 0));
+      }
+
+  XDestroyImage (in);
+  in = 0;
+
+  pixmap = XCreatePixmap (dpy, window, out->width, out->height, xgwa.depth);
+  gc = XCreateGC (dpy, pixmap, 0, &gcv);
+  XPutImage (dpy, pixmap, gc, out, 0, 0, 0, 0, out->width, out->height);
+  XFreeGC (dpy, gc);
+
+  if (mask)
+    {
+      Pixmap p2 = XCreatePixmap (dpy, window, mask->width, mask->height, 1);
+      gcv.foreground = 1;
+      gcv.background = 0;
+      gc = XCreateGC (dpy, p2, GCForeground|GCBackground, &gcv);
+      XPutImage (dpy, p2, gc, mask, 0, 0, 0, 0, mask->width, mask->height);
+      XFreeGC (dpy, gc);
+      XDestroyImage (mask);
+      mask = 0;
+      *mask_ret = p2;
+    }
+
+  if (width_ret)  *width_ret  = out->width;
+  if (height_ret) *height_ret = out->height;
+
+  XDestroyImage (out);
+
+  return pixmap;
+}
+
+
+/* Textures are upside down, so invert XImages before returning them.
+ */
+static void
+flip_ximage (XImage *ximage)
+{
+  char *data2, *in, *out;
+  int y;
+
+  data2 = malloc (ximage->bytes_per_line * ximage->height);
+  if (!data2) abort();
+  in = ximage->data;
+  out = data2 + ximage->bytes_per_line * (ximage->height - 1);
+  for (y = 0; y < ximage->height; y++)
+    {
+      memcpy (out, in, ximage->bytes_per_line);
+      in  += ximage->bytes_per_line;
+      out -= ximage->bytes_per_line;
+    }
+  free (ximage->data);
+  ximage->data = data2;
+}
+
+
+Pixmap
+image_data_to_pixmap (Display *dpy, Window window, 
+                      const unsigned char *image_data, unsigned long data_size,
+                      int *width_ret, int *height_ret,
+                      Pixmap *mask_ret)
+{
+  return make_pixmap (dpy, window, 0, image_data, data_size,
+                      width_ret, height_ret, mask_ret);
+}
+
+Pixmap
+file_to_pixmap (Display *dpy, Window window, const char *filename,
+                int *width_ret, int *height_ret,
+                Pixmap *mask_ret)
+{
+  return make_pixmap (dpy, window, filename, 0, 0,
+                      width_ret, height_ret, mask_ret);
+}
+
+
+XImage *
+image_data_to_ximage (Display *dpy, Visual *visual,
+                      const unsigned char *image_data,
+                      unsigned long data_size)
+{
+  XImage *ximage = make_ximage (dpy, visual, 0, image_data, data_size);
+  flip_ximage (ximage);
+  return ximage;
+}
+
+/* This XImage has RGBA data, which is what OpenGL code typically expects.
+   X11 typically expects 0RGB as it has no notion of alpha, only 1-bit masks.
+   With X11 code, you should probably use the _pixmap routines instead.
+ */
+XImage *
+file_to_ximage (Display *dpy, Visual *visual, const char *filename)
+{
+  XImage *ximage = make_ximage (dpy, visual, filename, 0, 0);
+  flip_ximage (ximage);
+  return ximage;
+}