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-rw-r--r--hacks/ximage-loader.c686
1 files changed, 686 insertions, 0 deletions
diff --git a/hacks/ximage-loader.c b/hacks/ximage-loader.c
new file mode 100644
index 0000000..382699b
--- /dev/null
+++ b/hacks/ximage-loader.c
@@ -0,0 +1,686 @@
+/* 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: %s\n",
+ progname, filename, (gerr ? gerr->message : "?"));
+ 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);
+
+ g_input_stream_close (s, NULL, NULL);
+ g_object_unref (s);
+
+ if (! pb)
+ {
+ /* fprintf (stderr, "%s: GDK unable to parse image data: %s\n",
+ progname, (gerr ? gerr->message : "?")); */
+ 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;
+
+ if (!ximage) return;
+ 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);
+}
+
+
+/* This XImage has RGBA data, which is what OpenGL code typically expects.
+ Also it is upside down: the origin is at the bottom left of the image.
+ 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 *
+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;
+}
+
+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;
+}
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