clang-format all pdfium code.

samples/fx_lpng/lpng_v163/pnginfo.h

 
 /* pnginfo.h - header file for PNG reference library
  *
  * Copyright (c) 1998-2013 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.)
  *
  * Last changed in libpng 1.6.1 [March 28, 2013]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h
  */
 
- /* png_info is a structure that holds the information in a PNG file so
- * that the application can find out the characteristics of the image.
- * If you are reading the file, this structure will tell you what is
- * in the PNG file.  If you are writing the file, fill in the information
- * you want to put into the PNG file, using png_set_*() functions, then
- * call png_write_info().
- *
- * The names chosen should be very close to the PNG specification, so
- * consult that document for information about the meaning of each field.
- *
- * With libpng < 0.95, it was only possible to directly set and read the
- * the values in the png_info_struct, which meant that the contents and
- * order of the values had to remain fixed.  With libpng 0.95 and later,
- * however, there are now functions that abstract the contents of
- * png_info_struct from the application, so this makes it easier to use
- * libpng with dynamic libraries, and even makes it possible to use
- * libraries that don't have all of the libpng ancillary chunk-handing
- * functionality.  In libpng-1.5.0 this was moved into a separate private
- * file that is not visible to applications.
- *
- * The following members may have allocated storage attached that should be
- * cleaned up before the structure is discarded: palette, trans, text,
- * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
- * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
- * are automatically freed when the info structure is deallocated, if they were
- * allocated internally by libpng.  This behavior can be changed by means
- * of the png_data_freer() function.
- *
- * More allocation details: all the chunk-reading functions that
- * change these members go through the corresponding png_set_*
- * functions.  A function to clear these members is available: see
- * png_free_data().  The png_set_* functions do not depend on being
- * able to point info structure members to any of the storage they are
- * passed (they make their own copies), EXCEPT that the png_set_text
- * functions use the same storage passed to them in the text_ptr or
- * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
- * functions do not make their own copies.
- */
+/* png_info is a structure that holds the information in a PNG file so
+* that the application can find out the characteristics of the image.
+* If you are reading the file, this structure will tell you what is
+* in the PNG file.  If you are writing the file, fill in the information
+* you want to put into the PNG file, using png_set_*() functions, then
+* call png_write_info().
+*
+* The names chosen should be very close to the PNG specification, so
+* consult that document for information about the meaning of each field.
+*
+* With libpng < 0.95, it was only possible to directly set and read the
+* the values in the png_info_struct, which meant that the contents and
+* order of the values had to remain fixed.  With libpng 0.95 and later,
+* however, there are now functions that abstract the contents of
+* png_info_struct from the application, so this makes it easier to use
+* libpng with dynamic libraries, and even makes it possible to use
+* libraries that don't have all of the libpng ancillary chunk-handing
+* functionality.  In libpng-1.5.0 this was moved into a separate private
+* file that is not visible to applications.
+*
+* The following members may have allocated storage attached that should be
+* cleaned up before the structure is discarded: palette, trans, text,
+* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
+* splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
+* are automatically freed when the info structure is deallocated, if they were
+* allocated internally by libpng.  This behavior can be changed by means
+* of the png_data_freer() function.
+*
+* More allocation details: all the chunk-reading functions that
+* change these members go through the corresponding png_set_*
+* functions.  A function to clear these members is available: see
+* png_free_data().  The png_set_* functions do not depend on being
+* able to point info structure members to any of the storage they are
+* passed (they make their own copies), EXCEPT that the png_set_text
+* functions use the same storage passed to them in the text_ptr or
+* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
+* functions do not make their own copies.
+*/
 #ifndef PNGINFO_H
 #define PNGINFO_H
 
-struct png_info_def
-{
-   /* The following are necessary for every PNG file */
-   png_uint_32 width;  /* width of image in pixels (from IHDR) */
-   png_uint_32 height; /* height of image in pixels (from IHDR) */
-   png_uint_32 valid;  /* valid chunk data (see PNG_INFO_ below) */
-   png_size_t rowbytes; /* bytes needed to hold an untransformed row */
-   png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
-   png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
-   png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
-   png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
-   png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
-   /* The following three should have been named *_method not *_type */
-   png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
-   png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
-   png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-
-   /* The following are set by png_set_IHDR, called from the application on
-    * write, but the are never actually used by the write code.
-    */
-   png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
-   png_byte pixel_depth;    /* number of bits per pixel */
-   png_byte spare_byte;     /* to align the data, and for future use */
+struct png_info_def {
+  /* The following are necessary for every PNG file */
+  png_uint_32 width;       /* width of image in pixels (from IHDR) */
+  png_uint_32 height;      /* height of image in pixels (from IHDR) */
+  png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
+  png_size_t rowbytes;     /* bytes needed to hold an untransformed row */
+  png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
+  png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
+  png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
+  png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
+  png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
+  /* The following three should have been named *_method not *_type */
+  png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
+  png_byte filter_type;      /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
+  png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
+
+  /* The following are set by png_set_IHDR, called from the application on
+   * write, but the are never actually used by the write code.
+   */
+  png_byte channels;    /* number of data channels per pixel (1, 2, 3, 4) */
+  png_byte pixel_depth; /* number of bits per pixel */
+  png_byte spare_byte;  /* to align the data, and for future use */
 
 #ifdef PNG_READ_SUPPORTED
-   /* This is never set during write */
-   png_byte signature[8];   /* magic bytes read by libpng from start of file */
-#endif
-
-   /* The rest of the data is optional.  If you are reading, check the
-    * valid field to see if the information in these are valid.  If you
-    * are writing, set the valid field to those chunks you want written,
-    * and initialize the appropriate fields below.
-    */
+  /* This is never set during write */
+  png_byte signature[8]; /* magic bytes read by libpng from start of file */
+#endif
+
+/* The rest of the data is optional.  If you are reading, check the
+ * valid field to see if the information in these are valid.  If you
+ * are writing, set the valid field to those chunks you want written,
+ * and initialize the appropriate fields below.
+ */
 
 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
-   /* png_colorspace only contains 'flags' if neither GAMMA or COLORSPACE are
-    * defined.  When COLORSPACE is switched on all the colorspace-defining
-    * chunks should be enabled, when GAMMA is switched on all the gamma-defining
-    * chunks should be enabled.  If this is not done it becomes possible to read
-    * inconsistent PNG files and assign a probably incorrect interpretation to
-    * the information.  (In other words, by carefully choosing which chunks to
-    * recognize the system configuration can select an interpretation for PNG
-    * files containing ambiguous data and this will result in inconsistent
-    * behavior between different libpng builds!)
-    */
-   png_colorspace colorspace;
+  /* png_colorspace only contains 'flags' if neither GAMMA or COLORSPACE are
+   * defined.  When COLORSPACE is switched on all the colorspace-defining
+   * chunks should be enabled, when GAMMA is switched on all the gamma-defining
+   * chunks should be enabled.  If this is not done it becomes possible to read
+   * inconsistent PNG files and assign a probably incorrect interpretation to
+   * the information.  (In other words, by carefully choosing which chunks to
+   * recognize the system configuration can select an interpretation for PNG
+   * files containing ambiguous data and this will result in inconsistent
+   * behavior between different libpng builds!)
+   */
+  png_colorspace colorspace;
 #endif
 
 #ifdef PNG_iCCP_SUPPORTED
-   /* iCCP chunk data. */
-   png_charp iccp_name;     /* profile name */
-   png_bytep iccp_profile;  /* International Color Consortium profile data */
-   png_uint_32 iccp_proflen;  /* ICC profile data length */
+  /* iCCP chunk data. */
+  png_charp iccp_name;      /* profile name */
+  png_bytep iccp_profile;   /* International Color Consortium profile data */
+  png_uint_32 iccp_proflen; /* ICC profile data length */
 #endif
 
 #ifdef PNG_TEXT_SUPPORTED
-   /* The tEXt, and zTXt chunks contain human-readable textual data in
-    * uncompressed, compressed, and optionally compressed forms, respectively.
-    * The data in "text" is an array of pointers to uncompressed,
-    * null-terminated C strings. Each chunk has a keyword that describes the
-    * textual data contained in that chunk.  Keywords are not required to be
-    * unique, and the text string may be empty.  Any number of text chunks may
-    * be in an image.
-    */
-   int num_text; /* number of comments read or comments to write */
-   int max_text; /* current size of text array */
-   png_textp text; /* array of comments read or comments to write */
-#endif /* PNG_TEXT_SUPPORTED */
+  /* The tEXt, and zTXt chunks contain human-readable textual data in
+   * uncompressed, compressed, and optionally compressed forms, respectively.
+   * The data in "text" is an array of pointers to uncompressed,
+   * null-terminated C strings. Each chunk has a keyword that describes the
+   * textual data contained in that chunk.  Keywords are not required to be
+   * unique, and the text string may be empty.  Any number of text chunks may
+   * be in an image.
+   */
+  int num_text;   /* number of comments read or comments to write */
+  int max_text;   /* current size of text array */
+  png_textp text; /* array of comments read or comments to write */
+#endif            /* PNG_TEXT_SUPPORTED */
 
 #ifdef PNG_tIME_SUPPORTED
-   /* The tIME chunk holds the last time the displayed image data was
-    * modified.  See the png_time struct for the contents of this struct.
-    */
-   png_time mod_time;
+  /* The tIME chunk holds the last time the displayed image data was
+   * modified.  See the png_time struct for the contents of this struct.
+   */
+  png_time mod_time;
 #endif
 
 #ifdef PNG_sBIT_SUPPORTED
-   /* The sBIT chunk specifies the number of significant high-order bits
-    * in the pixel data.  Values are in the range [1, bit_depth], and are
-    * only specified for the channels in the pixel data.  The contents of
-    * the low-order bits is not specified.  Data is valid if
-    * (valid & PNG_INFO_sBIT) is non-zero.
-    */
-   png_color_8 sig_bit; /* significant bits in color channels */
+  /* The sBIT chunk specifies the number of significant high-order bits
+   * in the pixel data.  Values are in the range [1, bit_depth], and are
+   * only specified for the channels in the pixel data.  The contents of
+   * the low-order bits is not specified.  Data is valid if
+   * (valid & PNG_INFO_sBIT) is non-zero.
+   */
+  png_color_8 sig_bit; /* significant bits in color channels */
 #endif
 
 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
 defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The tRNS chunk supplies transparency data for paletted images and
-    * other image types that don't need a full alpha channel.  There are
-    * "num_trans" transparency values for a paletted image, stored in the
-    * same order as the palette colors, starting from index 0.  Values
-    * for the data are in the range [0, 255], ranging from fully transparent
-    * to fully opaque, respectively.  For non-paletted images, there is a
-    * single color specified that should be treated as fully transparent.
-    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
-    */
-   png_bytep trans_alpha;    /* alpha values for paletted image */
-   png_color_16 trans_color; /* transparent color for non-palette image */
+  /* The tRNS chunk supplies transparency data for paletted images and
+   * other image types that don't need a full alpha channel.  There are
+   * "num_trans" transparency values for a paletted image, stored in the
+   * same order as the palette colors, starting from index 0.  Values
+   * for the data are in the range [0, 255], ranging from fully transparent
+   * to fully opaque, respectively.  For non-paletted images, there is a
+   * single color specified that should be treated as fully transparent.
+   * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
+   */
+  png_bytep trans_alpha;    /* alpha values for paletted image */
+  png_color_16 trans_color; /* transparent color for non-palette image */
 #endif
 
 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The bKGD chunk gives the suggested image background color if the
-    * display program does not have its own background color and the image
-    * is needs to composited onto a background before display.  The colors
-    * in "background" are normally in the same color space/depth as the
-    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
-    */
-   png_color_16 background;
+  /* The bKGD chunk gives the suggested image background color if the
+   * display program does not have its own background color and the image
+   * is needs to composited onto a background before display.  The colors
+   * in "background" are normally in the same color space/depth as the
+   * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
+   */
+  png_color_16 background;
 #endif
 
 #ifdef PNG_oFFs_SUPPORTED
-   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
-    * and downwards from the top-left corner of the display, page, or other
-    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
-    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
-    */
-   png_int_32 x_offset; /* x offset on page */
-   png_int_32 y_offset; /* y offset on page */
-   png_byte offset_unit_type; /* offset units type */
+  /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
+   * and downwards from the top-left corner of the display, page, or other
+   * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
+   * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
+   */
+  png_int_32 x_offset;       /* x offset on page */
+  png_int_32 y_offset;       /* y offset on page */
+  png_byte offset_unit_type; /* offset units type */
 #endif
 
 #ifdef PNG_pHYs_SUPPORTED
-   /* The pHYs chunk gives the physical pixel density of the image for
-    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
-    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
-    */
-   png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
-   png_uint_32 y_pixels_per_unit; /* vertical pixel density */
-   png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
+  /* The pHYs chunk gives the physical pixel density of the image for
+   * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
+   * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
+   */
+  png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
+  png_uint_32 y_pixels_per_unit; /* vertical pixel density */
+  png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
 #endif
 
 #ifdef PNG_hIST_SUPPORTED
-   /* The hIST chunk contains the relative frequency or importance of the
-    * various palette entries, so that a viewer can intelligently select a
-    * reduced-color palette, if required.  Data is an array of "num_palette"
-    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
-    * is non-zero.
-    */
-   png_uint_16p hist;
+  /* The hIST chunk contains the relative frequency or importance of the
+   * various palette entries, so that a viewer can intelligently select a
+   * reduced-color palette, if required.  Data is an array of "num_palette"
+   * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
+   * is non-zero.
+   */
+  png_uint_16p hist;
 #endif
 
 #ifdef PNG_pCAL_SUPPORTED
-   /* The pCAL chunk describes a transformation between the stored pixel
-    * values and original physical data values used to create the image.
-    * The integer range [0, 2^bit_depth - 1] maps to the floating-point
-    * range given by [pcal_X0, pcal_X1], and are further transformed by a
-    * (possibly non-linear) transformation function given by "pcal_type"
-    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
-    * defines below, and the PNG-Group's PNG extensions document for a
-    * complete description of the transformations and how they should be
-    * implemented, and for a description of the ASCII parameter strings.
-    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
-    */
-   png_charp pcal_purpose;  /* pCAL chunk description string */
-   png_int_32 pcal_X0;      /* minimum value */
-   png_int_32 pcal_X1;      /* maximum value */
-   png_charp pcal_units;    /* Latin-1 string giving physical units */
-   png_charpp pcal_params;  /* ASCII strings containing parameter values */
-   png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
-   png_byte pcal_nparams;   /* number of parameters given in pcal_params */
-#endif
-
-/* New members added in libpng-1.0.6 */
-   png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
+  /* The pCAL chunk describes a transformation between the stored pixel
+   * values and original physical data values used to create the image.
+   * The integer range [0, 2^bit_depth - 1] maps to the floating-point
+   * range given by [pcal_X0, pcal_X1], and are further transformed by a
+   * (possibly non-linear) transformation function given by "pcal_type"
+   * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
+   * defines below, and the PNG-Group's PNG extensions document for a
+   * complete description of the transformations and how they should be
+   * implemented, and for a description of the ASCII parameter strings.
+   * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
+   */
+  png_charp pcal_purpose; /* pCAL chunk description string */
+  png_int_32 pcal_X0;     /* minimum value */
+  png_int_32 pcal_X1;     /* maximum value */
+  png_charp pcal_units;   /* Latin-1 string giving physical units */
+  png_charpp pcal_params; /* ASCII strings containing parameter values */
+  png_byte pcal_type;     /* equation type (see PNG_EQUATION_ below) */
+  png_byte pcal_nparams;  /* number of parameters given in pcal_params */
+#endif
+
+  /* New members added in libpng-1.0.6 */
+  png_uint_32 free_me; /* flags items libpng is responsible for freeing */
 
 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-   /* Storage for unknown chunks that the library doesn't recognize. */
-   png_unknown_chunkp unknown_chunks;
-
-   /* The type of this field is limited by the type of 
-    * png_struct::user_chunk_cache_max, else overflow can occur.
-    */
-   int                unknown_chunks_num;
+  /* Storage for unknown chunks that the library doesn't recognize. */
+  png_unknown_chunkp unknown_chunks;
+
+  /* The type of this field is limited by the type of
+   * png_struct::user_chunk_cache_max, else overflow can occur.
+   */
+  int unknown_chunks_num;
 #endif
 
 #ifdef PNG_sPLT_SUPPORTED
-   /* Data on sPLT chunks (there may be more than one). */
-   png_sPLT_tp splt_palettes;
-   int         splt_palettes_num; /* Match type returned by png_get API */
+  /* Data on sPLT chunks (there may be more than one). */
+  png_sPLT_tp splt_palettes;
+  int splt_palettes_num; /* Match type returned by png_get API */
 #endif
 
 #ifdef PNG_sCAL_SUPPORTED
-   /* The sCAL chunk describes the actual physical dimensions of the
-    * subject matter of the graphic.  The chunk contains a unit specification
-    * a byte value, and two ASCII strings representing floating-point
-    * values.  The values are width and height corresponsing to one pixel
-    * in the image.  Data values are valid if (valid & PNG_INFO_sCAL) is
-    * non-zero.
-    */
-   png_byte scal_unit;         /* unit of physical scale */
-   png_charp scal_s_width;     /* string containing height */
-   png_charp scal_s_height;    /* string containing width */
+  /* The sCAL chunk describes the actual physical dimensions of the
+   * subject matter of the graphic.  The chunk contains a unit specification
+   * a byte value, and two ASCII strings representing floating-point
+   * values.  The values are width and height corresponsing to one pixel
+   * in the image.  Data values are valid if (valid & PNG_INFO_sCAL) is
+   * non-zero.
+   */
+  png_byte scal_unit;      /* unit of physical scale */
+  png_charp scal_s_width;  /* string containing height */
+  png_charp scal_s_height; /* string containing width */
 #endif
 
 #ifdef PNG_INFO_IMAGE_SUPPORTED
-   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
-      non-zero */
-   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
-   png_bytepp row_pointers;        /* the image bits */
-#endif
-
+  /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
+     non-zero */
+  /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
+  png_bytepp row_pointers; /* the image bits */
+#endif
 };
 #endif /* PNGINFO_H */