document that SetValue() accepts values in 0..GetRange interval, inclusive

[wxWidgets.git] / src / png / pngget.c

diff --git a/src/png/pngget.c b/src/png/pngget.c
index d3805a6e06bdde68524dc9cdb57d3040dcdf04e7..1d1cc218bdfec83bf07bfa5c7b2cb3fd3c2a7317 100644 (file)
--- a/src/png/pngget.c
+++ b/src/png/pngget.c
@@ -1,9 +1,9 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.2.4 - July 8, 2002
+ * libpng 1.2.7 - September 12, 2004
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2004 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -540,9 +540,6 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
       bit_depth != NULL && color_type != NULL)
    {
-      int pixel_depth, channels;
-      png_uint_32 rowbytes_per_pixel;
-
       png_debug1(1, "in %s retrieval function\n", "IHDR");
       *width = info_ptr->width;
       *height = info_ptr->height;
@@ -560,23 +557,18 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
          *interlace_type = info_ptr->interlace_type;
 
       /* check for potential overflow of rowbytes */
-      if (*color_type == PNG_COLOR_TYPE_PALETTE)
-         channels = 1;
-      else if (*color_type & PNG_COLOR_MASK_COLOR)
-         channels = 3;
-      else
-         channels = 1;
-      if (*color_type & PNG_COLOR_MASK_ALPHA)
-         channels++;
-      pixel_depth = *bit_depth * channels;
-      rowbytes_per_pixel = (pixel_depth + 7) >> 3;
-      if (width == 0 || *width > PNG_MAX_UINT)
+      if (width == 0 || *width > PNG_UINT_31_MAX)
         png_error(png_ptr, "Invalid image width");
-      if (height == 0 || *height > PNG_MAX_UINT)
+      if (height == 0 || *height > PNG_UINT_31_MAX)
         png_error(png_ptr, "Invalid image height");
-      if (*width > PNG_MAX_UINT/rowbytes_per_pixel - 64)
+      if (info_ptr->width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 64       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
       {
-         png_error(png_ptr,
+         png_warning(png_ptr,
             "Width too large for libpng to process image data.");
       }
       return (1);
@@ -827,13 +819,13 @@ png_get_user_chunk_ptr(png_structp png_ptr)
 }
 #endif
 
-
+#ifdef PNG_WRITE_SUPPORTED
 png_uint_32 PNGAPI
 png_get_compression_buffer_size(png_structp png_ptr)
 {
    return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
 }
-
+#endif
 
 #ifndef PNG_1_0_X
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
@@ -923,5 +915,20 @@ png_get_mmx_rowbytes_threshold (png_structp png_ptr)
 {
     return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
 }
-#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
-#endif /* PNG_1_0_X */
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+/* these functions were added to libpng 1.2.6 */
+png_uint_32 PNGAPI
+png_get_user_width_max (png_structp png_ptr)
+{
+    return (png_ptr? png_ptr->user_width_max : 0);
+}
+png_uint_32 PNGAPI
+png_get_user_height_max (png_structp png_ptr)
+{
+    return (png_ptr? png_ptr->user_height_max : 0);
+}
+#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
+
+#endif /* ?PNG_1_0_X */