gif.c File Reference

Content for image/gif implementation. More...

#include <assert.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <nsutils/assert.h>
#include <nsgif.h>
#include "utils/log.h"
#include "utils/utils.h"
#include "utils/messages.h"
#include "utils/nsoption.h"
#include "netsurf/misc.h"
#include "netsurf/bitmap.h"
#include "netsurf/content.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.h"
#include "image/gif.h"

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Data Structures
struct	gif_content

Typedefs
typedef struct gif_content	gif_content

Functions
static nserror	gif__nsgif_error_to_ns (nsgif_error gif_res)
static void *	gif_bitmap_create (int width, int height)
	Callback for libnsgif; forwards the call to bitmap_create() More...
static nsgif_bitmap_fmt_t	nsgif__get_bitmap_format (void)
	Convert client bitmap format to a LibNSGIF format specifier. More...
static nserror	gif_create_gif_data (gif_content *c)
static nserror	gif_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 void	gif_animate_cb (void *p)
	Scheduler callback. More...
static nserror	gif__animate (gif_content *gif, bool redraw)
	Performs any necessary animation. More...
static bool	gif_convert (struct content *c)
static nsgif_error	gif_get_frame (gif_content *gif, nsgif_bitmap_t **bitmap)
	Updates the GIF bitmap to display the current frame. More...
static bool	gif_redraw (struct content *c, struct content_redraw_data *data, const struct rect *clip, const struct redraw_context *ctx)
static void	gif_destroy (struct content *c)
static nserror	gif_clone (const struct content *old, struct content **newc)
static void	gif_add_user (struct content *c)
static void	gif_remove_user (struct content *c)
static nsgif_bitmap_t *	gif_get_bitmap (const struct content *c, void *context)
static content_type	gif_content_type (void)
static bool	gif_content_is_opaque (struct content *c)
	CONTENT_FACTORY_REGISTER_TYPES (nsgif, gif_types, gif_content_handler)

Variables
static const content_handler	gif_content_handler
static const char *	gif_types []

Detailed Description

Content for image/gif implementation.

All GIFs are dynamically decompressed using the routines that gifread.c provides. Whilst this allows support for progressive decoding, it is not implemented here as NetSurf currently does not provide such support.

[rjw] - Sun 4th April 2004

Definition in file gif.c.

Typedef Documentation

gif_content

typedef struct gif_content gif_content

Function Documentation

CONTENT_FACTORY_REGISTER_TYPES()

CONTENT_FACTORY_REGISTER_TYPES	(	nsgif	,
		gif_types	,
		gif_content_handler
	)

gif__animate()

static nserror gif__animate ( gif_content *  gif, bool  redraw  )

static

Performs any necessary animation.

Parameters

p	The content to animate

Definition at line 176 of file gif.c.

References gif_content::base, content_broadcast(), CONTENT_MSG_REDRAW, gif_content::current_frame, gif_content::gif, gif__nsgif_error_to_ns(), gif_animate_cb(), guit, content_msg_data::height, netsurf_table::misc, NSERROR_OK, nsoption_bool, content_msg_data::redraw, gui_misc_table::schedule, content_msg_data::width, content_msg_data::x, rect::x0, rect::x1, content_msg_data::y, rect::y0, and rect::y1.

Referenced by gif_add_user(), gif_animate_cb(), and gif_convert().

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gif__nsgif_error_to_ns()

static nserror gif__nsgif_error_to_ns ( nsgif_error  gif_res )

inlinestatic

Definition at line 66 of file gif.c.

References NSERROR_GIF_ERROR, and NSERROR_NOMEM.

Referenced by gif__animate(), gif_convert(), and gif_create_gif_data().

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gif_add_user()

static void gif_add_user ( struct content *  c )

static

Definition at line 356 of file gif.c.

References content_count_users(), gif_content::gif, and gif__animate().

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gif_animate_cb()

static void gif_animate_cb ( void *  p )

static

Scheduler callback.

Performs any necessary animation.

Parameters

p	The content to animate

Definition at line 210 of file gif.c.

References gif__animate().

Referenced by gif__animate(), gif_destroy(), and gif_remove_user().

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gif_bitmap_create()

static void * gif_bitmap_create ( int  width, int  height  )

static

Callback for libnsgif; forwards the call to bitmap_create()

Parameters

width	width of image in pixels
height	width of image in pixels

Returns

an opaque struct bitmap, or NULL on memory exhaustion

Definition at line 89 of file gif.c.

References netsurf_table::bitmap, BITMAP_NONE, gui_bitmap_table::create, guit, height, and width.

Referenced by gif_create_gif_data().

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gif_clone()

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

static

Definition at line 321 of file gif.c.

References gif_content::base, content__clone(), content_destroy(), CONTENT_STATUS_DONE, CONTENT_STATUS_READY, gif_convert(), gif_create_gif_data(), NSERROR_CLONE_FAILED, NSERROR_NOMEM, NSERROR_OK, and content::status.

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gif_content_is_opaque()

static bool gif_content_is_opaque ( struct content *  c )

static

Definition at line 398 of file gif.c.

References netsurf_table::bitmap, bitmap(), gui_bitmap_table::get_opaque, gif_get_frame(), and guit.

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gif_content_type()

static content_type gif_content_type ( void  )

static

Definition at line 393 of file gif.c.

References CONTENT_IMAGE.

gif_convert()

static bool gif_convert ( struct content *  c )

static

Definition at line 217 of file gif.c.

References content__get_source_data(), content__set_title(), content_broadcast_error(), content_set_done(), content_set_ready(), content_set_status(), gif_content::gif, gif__animate(), gif__nsgif_error_to_ns(), content::height, content::llcache, llcache_handle_get_url(), messages_get_buff(), NSERROR_GIF_ERROR, NSERROR_OK, NSLOG, nsurl_access_leaf(), content::size, content_msg_data::title, and content::width.

Referenced by gif_clone().

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gif_create()

static nserror gif_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

Definition at line 134 of file gif.c.

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

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gif_create_gif_data()

static nserror gif_create_gif_data ( gif_content *  c )

static

Definition at line 111 of file gif.c.

References gif_content::base, netsurf_table::bitmap, bitmap_test_opaque(), content_broadcast_error(), gui_bitmap_table::destroy, gui_bitmap_table::get_buffer, gif_content::gif, gif__nsgif_error_to_ns(), gif_bitmap_create(), guit, gui_bitmap_table::modified, NSERROR_OK, nsgif__get_bitmap_format(), and gui_bitmap_table::set_opaque.

Referenced by gif_clone(), and gif_create().

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gif_destroy()

static void gif_destroy ( struct content *  c )

static

Definition at line 312 of file gif.c.

References gif_content::gif, gif_animate_cb(), guit, netsurf_table::misc, and gui_misc_table::schedule.

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gif_get_bitmap()

static nsgif_bitmap_t * gif_get_bitmap ( const struct content *  c, void *  context  )

static

Definition at line 380 of file gif.c.

References bitmap(), and gif_get_frame().

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gif_get_frame()

static nsgif_error gif_get_frame ( gif_content *  gif, nsgif_bitmap_t **  bitmap  )

static

Updates the GIF bitmap to display the current frame.

Parameters

gif	The gif context to update.

Returns

NSGIF_OK on success else apropriate error code.

Definition at line 288 of file gif.c.

References gif_content::current_frame, gif_content::gif, and nsoption_bool.

Referenced by gif_content_is_opaque(), gif_get_bitmap(), and gif_redraw().

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gif_redraw()

static bool gif_redraw ( struct content *  c, struct content_redraw_data *  data, const struct rect *  clip, const struct redraw_context *  ctx  )

static

Definition at line 299 of file gif.c.

References bitmap(), clip(), content_msg_data::ctx, gif_get_frame(), and image_bitmap_plot().

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gif_remove_user()

static void gif_remove_user ( struct content *  c )

static

Definition at line 372 of file gif.c.

References content_count_users(), gif_animate_cb(), guit, netsurf_table::misc, and gui_misc_table::schedule.

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nsgif__get_bitmap_format()

static nsgif_bitmap_fmt_t nsgif__get_bitmap_format ( void  )

static

Convert client bitmap format to a LibNSGIF format specifier.

Definition at line 97 of file gif.c.

References BITMAP_LAYOUT_A8B8G8R8, BITMAP_LAYOUT_A8R8G8B8, BITMAP_LAYOUT_ABGR8888, BITMAP_LAYOUT_ARGB8888, BITMAP_LAYOUT_B8G8R8A8, BITMAP_LAYOUT_BGRA8888, BITMAP_LAYOUT_R8G8B8A8, BITMAP_LAYOUT_RGBA8888, and bitmap_fmt::layout.

Referenced by gif_create_gif_data().

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Variable Documentation

gif_content_handler

const content_handler gif_content_handler

static

Initial value:

= {
        .create = gif_create,
        .data_complete = gif_convert,
        .destroy = gif_destroy,
        .redraw = gif_redraw,
        .clone = gif_clone,
        .add_user = gif_add_user,
        .remove_user = gif_remove_user,
        .get_internal = gif_get_bitmap,
        .type = gif_content_type,
        .is_opaque = gif_content_is_opaque,
        .no_share = false,
}

Definition at line 410 of file gif.c.

gif_types

const char* gif_types[]

static

Initial value:

= {
        "image/gif"
}

Definition at line 424 of file gif.c.