png.c File Reference

#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <png.h>
#include "netsurf/inttypes.h"
#include "utils/utils.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "netsurf/bitmap.h"
#include "content/llcache.h"
#include "content/content_protected.h"
#include "content/content_factory.h"
#include "desktop/gui_internal.h"
#include "desktop/bitmap.h"
#include "image/image_cache.h"

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Data Structures
struct	nspng_content
struct	png_cache_read_data_s

Macros
#define	png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
#define	png_set_expand_gray_1_2_4_to_8(png)   png_set_gray_1_2_4_to_8(png)

Typedefs
typedef struct nspng_content	nspng_content

Enumerations
enum	nspng_cberr { CBERR_NONE = 0 , CBERR_LIBPNG , CBERR_NOPRE }
	Callbak error numbers. More...

Functions
static void	nspng_warning (png_structp png_ptr, png_const_charp warning_message)
	nspng_warning – callback for libpng warnings More...
static void	nspng_error (png_structp png_ptr, png_const_charp error_message)
	nspng_error – callback for libpng errors More...
static void	nspng_setup_transforms (png_structp png_ptr, png_infop info_ptr)
static void	info_callback (png_structp png_s, png_infop info)
	info_callback – PNG header has been completely received, prepare to process image data More...
static void	row_callback (png_structp png_s, png_bytep new_row, png_uint_32 row_num, int pass)
static void	end_callback (png_structp png_s, png_infop info)
static nserror	nspng_create_png_data (nspng_content *png_c)
static nserror	nspng_create (const content_handler *handler, lwc_string *imime_type, const struct http_parameter *params, struct llcache_handle *llcache, const char *fallback_charset, bool quirks, struct content **c)
static bool	nspng_process_data (struct content *c, const char *data, unsigned int size)
static void	png_cache_read_fn (png_structp png_ptr, png_bytep data, png_size_t length)
	PNG library read fucntion to read data from a memory array. More...
static png_bytep *	calc_row_pointers (struct bitmap *bitmap)
	calculate an array of row pointers into a bitmap data area More...
static struct bitmap *	png_cache_convert (struct content *c)
	PNG content to bitmap conversion. More...
static bool	nspng_convert (struct content *c)
static nserror	nspng_clone (const struct content *old_c, struct content **new_c)
	CONTENT_FACTORY_REGISTER_TYPES (nspng, nspng_types, nspng_content_handler)

Variables
static unsigned int	interlace_start [8] = {0, 16, 0, 8, 0, 4, 0}
static unsigned int	interlace_step [8] = {28, 28, 12, 12, 4, 4, 0}
static unsigned int	interlace_row_start [8] = {0, 0, 4, 0, 2, 0, 1}
static unsigned int	interlace_row_step [8] = {8, 8, 8, 4, 4, 2, 2}
static const content_handler	nspng_content_handler
static const char *	nspng_types []

Macro Definition Documentation

png_jmpbuf

#define png_jmpbuf

(

png_ptr

)

((png_ptr)->jmpbuf)

Definition at line 44 of file png.c.

png_set_expand_gray_1_2_4_to_8

#define png_set_expand_gray_1_2_4_to_8

(

png

)

png_set_gray_1_2_4_to_8(png)

Definition at line 48 of file png.c.

Typedef Documentation

nspng_content

typedef struct nspng_content nspng_content

Enumeration Type Documentation

nspng_cberr

enum nspng_cberr

Callbak error numbers.

Enumerator
CBERR_NONE
CBERR_LIBPNG
CBERR_NOPRE

Definition at line 69 of file png.c.

Function Documentation

calc_row_pointers()

static png_bytep * calc_row_pointers ( struct bitmap *  bitmap )

static

calculate an array of row pointers into a bitmap data area

Definition at line 430 of file png.c.

References netsurf_table::bitmap, buffer, gui_bitmap_table::get_buffer, gui_bitmap_table::get_height, gui_bitmap_table::get_rowstride, guit, and height.

Referenced by png_cache_convert().

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CONTENT_FACTORY_REGISTER_TYPES()

CONTENT_FACTORY_REGISTER_TYPES	(	nspng	,
		nspng_types	,
		nspng_content_handler
	)

end_callback()

static void end_callback ( png_structp  png_s, png_infop  info  )

static

Definition at line 267 of file png.c.

Referenced by nspng_create_png_data().

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info_callback()

static void info_callback ( png_structp  png_s, png_infop  info  )

static

info_callback – PNG header has been completely received, prepare to process image data

Definition at line 176 of file png.c.

References nspng_content::base, nspng_content::bitmap, netsurf_table::bitmap, BITMAP_NONE, nspng_content::bpp, CBERR_NOPRE, gui_bitmap_table::create, gui_bitmap_table::get_rowstride, guit, content::height, height, image_cache_speculate(), nspng_content::interlace, NSLOG, nspng_setup_transforms(), png_jmpbuf, PRIsizet, nspng_content::rowbytes, nspng_content::rowstride, content::size, content::width, and width.

Referenced by nspng_create_png_data().

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nspng_clone()

static nserror nspng_clone ( const struct content *  old_c, struct content **  new_c  )

static

Definition at line 593 of file png.c.

References nspng_content::base, content__clone(), content__get_source_data(), content_destroy(), CONTENT_STATUS_DONE, CONTENT_STATUS_READY, png_cache_read_data_s::data, NSERROR_CLONE_FAILED, NSERROR_NOMEM, NSERROR_OK, nspng_convert(), nspng_create_png_data(), nspng_process_data(), png_cache_read_data_s::size, and content::status.

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nspng_convert()

static bool nspng_convert ( struct content *  c )

static

Definition at line 553 of file png.c.

References nspng_content::bitmap, netsurf_table::bitmap, bitmap_format_to_client(), bitmap_test_opaque(), content__set_title(), content_set_done(), content_set_ready(), content_set_status(), guit, content::height, image_cache_add(), nspng_content::info, content::llcache, llcache_handle_get_url(), messages_get_buff(), gui_bitmap_table::modified, nsurl_access_leaf(), nspng_content::png, png_cache_convert(), gui_bitmap_table::set_opaque, and content::width.

Referenced by nspng_clone().

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nspng_create()

static nserror nspng_create ( const content_handler *  handler, lwc_string *  imime_type, const struct http_parameter *  params, struct llcache_handle *  llcache, const char *  fallback_charset, bool  quirks, struct content **  c  )

static

Definition at line 308 of file png.c.

References nspng_content::base, content__init(), llcache, NSERROR_NOMEM, NSERROR_OK, and nspng_create_png_data().

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nspng_create_png_data()

static nserror nspng_create_png_data ( nspng_content *  png_c )

static

Definition at line 271 of file png.c.

References nspng_content::base, nspng_content::bitmap, content_broadcast_error(), end_callback(), nspng_content::info, info_callback(), NSERROR_NOMEM, NSERROR_OK, NSERROR_PNG_ERROR, NSLOG, nspng_error(), nspng_warning(), nspng_content::png, png_jmpbuf, and row_callback().

Referenced by nspng_clone(), and nspng_create().

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nspng_error()

static void nspng_error ( png_structp  png_ptr, png_const_charp  error_message  )

static

nspng_error – callback for libpng errors

Definition at line 86 of file png.c.

References CBERR_LIBPNG, NSLOG, and png_jmpbuf.

Referenced by nspng_create_png_data(), and png_cache_convert().

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nspng_process_data()

static bool nspng_process_data ( struct content *  c, const char *  data, unsigned int  size  )

static

Definition at line 347 of file png.c.

References nspng_content::bitmap, CBERR_NONE, CBERR_NOPRE, content_broadcast_error(), nspng_content::info, nspng_content::no_process_data, NSERROR_PNG_ERROR, NSLOG, nspng_content::png, png_jmpbuf, and content::size.

Referenced by nspng_clone().

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nspng_setup_transforms()

static void nspng_setup_transforms ( png_structp  png_ptr, png_infop  info_ptr  )

static

Definition at line 92 of file png.c.

References BITMAP_LAYOUT_A8B8G8R8, BITMAP_LAYOUT_A8R8G8B8, BITMAP_LAYOUT_B8G8R8A8, bitmap_fmt::layout, and png_set_expand_gray_1_2_4_to_8.

Referenced by info_callback(), and png_cache_convert().

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nspng_warning()

static void nspng_warning ( png_structp  png_ptr, png_const_charp  warning_message  )

static

nspng_warning – callback for libpng warnings

Definition at line 78 of file png.c.

References NSLOG.

Referenced by nspng_create_png_data(), and png_cache_convert().

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png_cache_convert()

static struct bitmap * png_cache_convert ( struct content *  c )

static

PNG content to bitmap conversion.

This routine generates a bitmap object from a PNG image content

Definition at line 461 of file png.c.

References netsurf_table::bitmap, bitmap(), bitmap_format_to_client(), BITMAP_NONE, bitmap_test_opaque(), calc_row_pointers(), content__get_source_data(), gui_bitmap_table::create, png_cache_read_data_s::data, gui_bitmap_table::destroy, guit, height, bitmap_fmt::layout, gui_bitmap_table::modified, nspng_error(), nspng_setup_transforms(), nspng_warning(), bitmap_fmt::pma, png_cache_read_fn(), png_jmpbuf, gui_bitmap_table::set_opaque, png_cache_read_data_s::size, and width.

Referenced by nspng_convert().

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png_cache_read_fn()

static void png_cache_read_fn ( png_structp  png_ptr, png_bytep  data, png_size_t  length  )

static

PNG library read fucntion to read data from a memory array.

Definition at line 409 of file png.c.

References png_cache_read_data_s::data, and png_cache_read_data_s::size.

Referenced by png_cache_convert().

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row_callback()

static void row_callback ( png_structp  png_s, png_bytep  new_row, png_uint_32  row_num, int  pass  )

static

Definition at line 214 of file png.c.

References nspng_content::bitmap, netsurf_table::bitmap, buffer, gui_bitmap_table::get_buffer, guit, nspng_content::interlace, interlace_row_start, interlace_row_step, interlace_start, interlace_step, png_jmpbuf, nspng_content::rowbytes, and nspng_content::rowstride.

Referenced by nspng_create_png_data().

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Variable Documentation

interlace_row_start

unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1}

static

Definition at line 65 of file png.c.

Referenced by row_callback().

interlace_row_step

unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2}

static

Definition at line 66 of file png.c.

Referenced by row_callback().

interlace_start

unsigned int interlace_start[8] = {0, 16, 0, 8, 0, 4, 0}

static

Definition at line 63 of file png.c.

Referenced by row_callback().

interlace_step

unsigned int interlace_step[8] = {28, 28, 12, 12, 4, 4, 0}

static

Definition at line 64 of file png.c.

Referenced by row_callback().

nspng_content_handler

const content_handler nspng_content_handler

static

Initial value:

= {
        .create = nspng_create,
        .process_data = nspng_process_data,
        .data_complete = nspng_convert,
        .clone = nspng_clone,
        .destroy = image_cache_destroy,
        .redraw = image_cache_redraw,
        .get_internal = image_cache_get_internal,
        .type = image_cache_content_type,
        .is_opaque = image_cache_is_opaque,
        .no_share = false,
}

Definition at line 638 of file png.c.

nspng_types

const char* nspng_types[]

static

Initial value:

= {
        "image/png",
        "image/x-png"
}

Definition at line 651 of file png.c.