jpeg.c File Reference

implementation of content handling for image/jpeg More...

#include <stdbool.h>
#include <stdlib.h>
#include <setjmp.h>
#include "utils/utils.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "netsurf/bitmap.h"
#include "content/llcache.h"
#include "content/content.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"
#include "jpeglib.h"
#include "jpeg.h"

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Macros
#define	JPEG_INTERNAL_OPTIONS
#define	MIN_JPEG_SIZE   20
	absolute minimum size of a jpeg below which it is not even worth trying to read header data More...
#define	DIV255(x)   ((x) + 1 + ((x) >> 8)) >> 8

Functions
static nserror	nsjpeg_create (const content_handler *handler, lwc_string *imime_type, const struct http_parameter *params, llcache_handle *llcache, const char *fallback_charset, bool quirks, struct content **c)
	Content create entry point. More...
static void	nsjpeg_init_source (j_decompress_ptr cinfo)
	JPEG data source manager: initialize source. More...
static boolean	nsjpeg_fill_input_buffer (j_decompress_ptr cinfo)
	JPEG data source manager: fill the input buffer. More...
static void	nsjpeg_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
	JPEG data source manager: skip num_bytes worth of data. More...
static void	nsjpeg_term_source (j_decompress_ptr cinfo)
	JPEG data source manager: terminate source. More...
static void	nsjpeg_error_log (j_common_ptr cinfo)
	Error output handler for JPEG library. More...
static void	nsjpeg_error_exit (j_common_ptr cinfo)
	Fatal error handler for JPEG library. More...
static void	nsjpeg__decode_cmyk (struct jpeg_decompress_struct *cinfo, uint8_t *volatile pixels, size_t rowstride)
	Convert scan lines from CMYK to core client bitmap layout. More...
static void	nsjpeg__decode_rgb (struct jpeg_decompress_struct *cinfo, uint8_t *volatile pixels, size_t rowstride)
	Convert scan lines from CMYK to core client bitmap layout. More...
static void	nsjpeg__decode_client_fmt (struct jpeg_decompress_struct *cinfo, uint8_t *volatile pixels, size_t rowstride)
	Convert scan lines from CMYK to core client bitmap layout. More...
static struct bitmap *	jpeg_cache_convert (struct content *c)
	create a bitmap from jpeg content. More...
static bool	nsjpeg_convert (struct content *c)
	Convert a CONTENT_JPEG for display. More...
static nserror	nsjpeg_clone (const struct content *old, struct content **newc)
	Clone content. More...
	CONTENT_FACTORY_REGISTER_TYPES (nsjpeg, nsjpeg_types, nsjpeg_content_handler)

Variables
static char	nsjpeg_error_buffer [JMSG_LENGTH_MAX]
static unsigned char	nsjpeg_eoi [] = { 0xff, JPEG_EOI }
static const content_handler	nsjpeg_content_handler
static const char *	nsjpeg_types []

Detailed Description

implementation of content handling for image/jpeg

This implementation uses the IJG JPEG library.

Definition in file jpeg.c.

Macro Definition Documentation

DIV255

#define DIV255

(

x

)

((x) + 1 + ((x) >> 8)) >> 8

JPEG_INTERNAL_OPTIONS

#define JPEG_INTERNAL_OPTIONS

Definition at line 44 of file jpeg.c.

MIN_JPEG_SIZE

#define MIN_JPEG_SIZE   20

absolute minimum size of a jpeg below which it is not even worth trying to read header data

Definition at line 51 of file jpeg.c.

Function Documentation

CONTENT_FACTORY_REGISTER_TYPES()

CONTENT_FACTORY_REGISTER_TYPES	(	nsjpeg	,
		nsjpeg_types	,
		nsjpeg_content_handler
	)

jpeg_cache_convert()

static struct bitmap * jpeg_cache_convert ( struct content *  c )

static

create a bitmap from jpeg content.

Definition at line 257 of file jpeg.c.

References netsurf_table::bitmap, bitmap(), BITMAP_LAYOUT_A8B8G8R8, BITMAP_LAYOUT_A8R8G8B8, BITMAP_LAYOUT_B8G8R8A8, BITMAP_LAYOUT_R8G8B8A8, BITMAP_OPAQUE, content__get_source_data(), gui_bitmap_table::create, gui_bitmap_table::destroy, gui_bitmap_table::get_buffer, gui_bitmap_table::get_rowstride, guit, bitmap_fmt::layout, MIN_JPEG_SIZE, gui_bitmap_table::modified, nsjpeg__decode_client_fmt(), nsjpeg__decode_cmyk(), nsjpeg__decode_rgb(), nsjpeg_error_exit(), nsjpeg_error_log(), nsjpeg_fill_input_buffer(), nsjpeg_init_source(), nsjpeg_skip_input_data(), nsjpeg_term_source(), NSLOG, and bitmap::rowstride.

Referenced by nsjpeg_convert().

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nsjpeg__decode_client_fmt()

static void nsjpeg__decode_client_fmt ( struct jpeg_decompress_struct *  cinfo, uint8_t *volatile  pixels, size_t  rowstride  )

inlinestatic

Convert scan lines from CMYK to core client bitmap layout.

Definition at line 239 of file jpeg.c.

Referenced by jpeg_cache_convert().

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nsjpeg__decode_cmyk()

static void nsjpeg__decode_cmyk ( struct jpeg_decompress_struct *  cinfo, uint8_t *volatile  pixels, size_t  rowstride  )

inlinestatic

Convert scan lines from CMYK to core client bitmap layout.

Definition at line 166 of file jpeg.c.

References DIV255, and width.

Referenced by jpeg_cache_convert().

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nsjpeg__decode_rgb()

static void nsjpeg__decode_rgb ( struct jpeg_decompress_struct *  cinfo, uint8_t *volatile  pixels, size_t  rowstride  )

inlinestatic

Convert scan lines from CMYK to core client bitmap layout.

Definition at line 204 of file jpeg.c.

References width.

Referenced by jpeg_cache_convert().

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nsjpeg_clone()

static nserror nsjpeg_clone ( const struct content *  old, struct content **  newc  )

static

Clone content.

Definition at line 456 of file jpeg.c.

References content__clone(), content_destroy(), CONTENT_STATUS_DONE, CONTENT_STATUS_READY, NSERROR_CLONE_FAILED, NSERROR_NOMEM, NSERROR_OK, nsjpeg_convert(), and content::status.

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nsjpeg_convert()

static bool nsjpeg_convert ( struct content *  c )

static

Convert a CONTENT_JPEG for display.

Definition at line 386 of file jpeg.c.

References content__get_source_data(), content__set_title(), content_broadcast(), CONTENT_MSG_ERROR, content_set_done(), content_set_ready(), content_set_status(), content_msg_data::errorcode, content_msg_data::errordata, content_msg_data::errormsg, content::height, image_cache_add(), jpeg_cache_convert(), content::llcache, llcache_handle_get_url(), messages_get_buff(), NSERROR_UNKNOWN, nsjpeg_error_buffer, nsjpeg_error_exit(), nsjpeg_error_log(), nsjpeg_fill_input_buffer(), nsjpeg_init_source(), nsjpeg_skip_input_data(), nsjpeg_term_source(), nsurl_access_leaf(), content::size, content_msg_data::title, and content::width.

Referenced by nsjpeg_clone().

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nsjpeg_create()

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

static

Content create entry point.

Definition at line 64 of file jpeg.c.

References content__init(), content::fallback_charset, content::handler, llcache, NSERROR_NOMEM, NSERROR_OK, and content::quirks.

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nsjpeg_error_exit()

static void nsjpeg_error_exit ( j_common_ptr  cinfo )

static

Fatal error handler for JPEG library.

This prevents jpeglib calling exit() on a fatal error.

Definition at line 153 of file jpeg.c.

References nsjpeg_error_buffer, and NSLOG.

Referenced by jpeg_cache_convert(), and nsjpeg_convert().

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nsjpeg_error_log()

static void nsjpeg_error_log ( j_common_ptr  cinfo )

static

Error output handler for JPEG library.

This logs to NetSurf log instead of stderr. Warnings only - fatal errors are trapped by nsjpeg_error_exit and do not call the output handler.

Definition at line 141 of file jpeg.c.

References nsjpeg_error_buffer, and NSLOG.

Referenced by jpeg_cache_convert(), and nsjpeg_convert().

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nsjpeg_fill_input_buffer()

static boolean nsjpeg_fill_input_buffer ( j_decompress_ptr  cinfo )

static

JPEG data source manager: fill the input buffer.

This can only occur if the JPEG data was truncated or corrupted. Insert a fake EOI marker to allow the decompressor to output as much as possible.

Definition at line 102 of file jpeg.c.

References nsjpeg_eoi.

Referenced by jpeg_cache_convert(), and nsjpeg_convert().

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nsjpeg_init_source()

static void nsjpeg_init_source ( j_decompress_ptr  cinfo )

static

JPEG data source manager: initialize source.

Definition at line 91 of file jpeg.c.

Referenced by jpeg_cache_convert(), and nsjpeg_convert().

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nsjpeg_skip_input_data()

static void nsjpeg_skip_input_data ( j_decompress_ptr  cinfo, long  num_bytes  )

static

JPEG data source manager: skip num_bytes worth of data.

Definition at line 114 of file jpeg.c.

Referenced by jpeg_cache_convert(), and nsjpeg_convert().

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nsjpeg_term_source()

static void nsjpeg_term_source ( j_decompress_ptr  cinfo )

static

JPEG data source manager: terminate source.

Definition at line 129 of file jpeg.c.

Referenced by jpeg_cache_convert(), and nsjpeg_convert().

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Variable Documentation

nsjpeg_content_handler

const content_handler nsjpeg_content_handler

static

Initial value:

= {
        .create = nsjpeg_create,
        .data_complete = nsjpeg_convert,
        .destroy = image_cache_destroy,
        .redraw = image_cache_redraw,
        .clone = nsjpeg_clone,
        .get_internal = image_cache_get_internal,
        .type = image_cache_content_type,
        .is_opaque = image_cache_is_opaque,
        .no_share = false,
}

Definition at line 485 of file jpeg.c.

nsjpeg_eoi

unsigned char nsjpeg_eoi[] = { 0xff, JPEG_EOI }

static

Definition at line 59 of file jpeg.c.

Referenced by nsjpeg_fill_input_buffer().

nsjpeg_error_buffer

char nsjpeg_error_buffer[JMSG_LENGTH_MAX]

static

Definition at line 57 of file jpeg.c.

Referenced by nsjpeg_convert(), nsjpeg_error_exit(), and nsjpeg_error_log().

nsjpeg_types

const char* nsjpeg_types[]

static

Initial value:

= {
        "image/jpeg",
        "image/jpg",
        "image/pjpeg"
}

Definition at line 497 of file jpeg.c.