adding placeholders and work in progress files

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

diff --git a/src/png/pngwtran.c b/src/png/pngwtran.c
index 1ce2a6d4471b563f9e0a9ee5dd4e30309fb1bf13..398fc41be615842740745c4f9f2dec09750cb161 100644 (file)
--- a/src/png/pngwtran.c
+++ b/src/png/pngwtran.c
@@ -1,9 +1,9 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.2.5rc3 - September 18, 2002
+ * Last changed in libpng 1.2.9 April 14, 2006
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2006 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.)
  */
@@ -18,14 +18,14 @@
 void /* PRIVATE */
 png_do_write_transformations(png_structp png_ptr)
 {
-   png_debug(1, "in png_do_write_transformations\n");
+   png_debug(1, "in png_do_write_transformations");
 
    if (png_ptr == NULL)
       return;
 
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    if (png_ptr->transformations & PNG_USER_TRANSFORM)
-      if(png_ptr->write_user_transform_fn != NULL)
+      if (png_ptr->write_user_transform_fn != NULL)
         (*(png_ptr->write_user_transform_fn)) /* user write transform function */
           (png_ptr,                    /* png_ptr */
            &(png_ptr->row_info),       /* row_info:     */
@@ -60,14 +60,14 @@ png_do_write_transformations(png_structp png_ptr)
       png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
          &(png_ptr->shift));
 #endif
-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-   if (png_ptr->transformations & PNG_INVERT_ALPHA)
-      png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
    if (png_ptr->transformations & PNG_SWAP_ALPHA)
       png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+   if (png_ptr->transformations & PNG_INVERT_ALPHA)
+      png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
 #if defined(PNG_WRITE_BGR_SUPPORTED)
    if (png_ptr->transformations & PNG_BGR)
       png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -86,7 +86,7 @@ png_do_write_transformations(png_structp png_ptr)
 void /* PRIVATE */
 png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 {
-   png_debug(1, "in png_do_pack\n");
+   png_debug(1, "in png_do_pack");
    if (row_info->bit_depth == 8 &&
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&
@@ -195,8 +195,8 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
       }
       row_info->bit_depth = (png_byte)bit_depth;
       row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
-      row_info->rowbytes =
-         ((row_info->width * row_info->pixel_depth + 7) >> 3);
+      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
+         row_info->width);
    }
 }
 #endif
@@ -212,7 +212,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 void /* PRIVATE */
 png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 {
-   png_debug(1, "in png_do_shift\n");
+   png_debug(1, "in png_do_shift");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL &&
 #else
@@ -336,7 +336,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 void /* PRIVATE */
 png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_swap_alpha\n");
+   png_debug(1, "in png_do_write_swap_alpha");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL)
 #endif
@@ -424,7 +424,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 void /* PRIVATE */
 png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_invert_alpha\n");
+   png_debug(1, "in png_do_write_invert_alpha");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL)
 #endif
@@ -439,9 +439,12 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
             png_uint_32 row_width = row_info->width;
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               /* does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
+               */
+               sp+=3; dp = sp;
                *(dp++) = (png_byte)(255 - *(sp++));
             }
          }
@@ -454,12 +457,15 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               /* does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
+               */
+               sp+=6; dp = sp;
                *(dp++) = (png_byte)(255 - *(sp++));
                *(dp++) = (png_byte)(255 - *(sp++));
             }
@@ -489,8 +495,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               /* does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
+               */
+               sp+=2; dp = sp;
                *(dp++) = (png_byte)(255 - *(sp++));
                *(dp++) = (png_byte)(255 - *(sp++));
             }
@@ -505,7 +514,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 void /* PRIVATE */
 png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_intrapixel\n");
+   png_debug(1, "in png_do_write_intrapixel");
    if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&
@@ -546,15 +555,15 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
 
          for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
          {
-            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
-            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
-            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
-            png_uint_32 red=(s0-s1)&0xffff;
-            png_uint_32 blue=(s2-s1)&0xffff;
-            *(rp  ) = (png_byte)((red>>8)&0xff);
-            *(rp+1) = (png_byte)(red&0xff);
-            *(rp+4) = (png_byte)((blue>>8)&0xff);
-            *(rp+5) = (png_byte)(blue&0xff);
+            png_uint_32 s0   = (*(rp  ) << 8) | *(rp+1);
+            png_uint_32 s1   = (*(rp+2) << 8) | *(rp+3);
+            png_uint_32 s2   = (*(rp+4) << 8) | *(rp+5);
+            png_uint_32 red  = (png_uint_32)((s0 - s1) & 0xffffL);
+            png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
+            *(rp  ) = (png_byte)((red >> 8) & 0xff);
+            *(rp+1) = (png_byte)(red & 0xff);
+            *(rp+4) = (png_byte)((blue >> 8) & 0xff);
+            *(rp+5) = (png_byte)(blue & 0xff);
          }
       }
    }