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Fix image handling in Fl_Help_View (STR #2163 and STR #2004).

Browse Source 
src/Fl_Help_View.cxx:

This fix is the first step and compatible with FLTK 1.1 (keeping the ABI).
The next step should be to manage the loaded images in an own structure,
because we must know exactly, when to release() the images. The previous
version would release images too many times and could release shared
images that had been loaded by another part of the program (maybe even
another Fl_Help_View widget).

FL/Fl_Help_View.H:

Doxygen comments improved.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6743 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser 2009-04-07 17:33:22 +00:00
parent 6534c6675a
commit 20132902af
2 changed files with 152 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
FL/Fl_Help_View.H
View File

@ -87,7 +87,7 @@ struct Fl_Help_Link
* Fl_Help_View font stack opaque implementation
*/
/** Fl_Help_View font stack element definition */
/** Fl_Help_View font stack element definition. */
struct Fl_Help_Font_Style {
Fl_Font f; ///< Font
Fl_Fontsize s; ///< Font Size
@ -98,11 +98,11 @@ struct Fl_Help_Font_Style {
Fl_Help_Font_Style(){} // For in table use
};
/** Fl_Help_View font stack definition */
/** Fl_Help_View font stack definition. */
const size_t MAX_FL_HELP_FS_ELTS = 100;
struct Fl_Help_Font_Stack {
/** font stack construction, initialize attributes.*/
/** font stack construction, initialize attributes. */
Fl_Help_Font_Stack() {
nfonts_ = 0;
}
@ -113,7 +113,7 @@ struct Fl_Help_Font_Stack {
fl_font(f, s);
fl_color(c);
}
/** Gets the top (current) elt on the stack */
/** Gets the top (current) element on the stack. */
void top(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) { elts_[nfonts_].get(f, s, c); }
/** Pushes the font style triplet on the stack, also calls fl_font() & fl_color() adequately */
void push(Fl_Font f, Fl_Fontsize s, Fl_Color c) {
@ -127,8 +127,8 @@ struct Fl_Help_Font_Stack {
top(f, s, c);
fl_font(f, s); fl_color(c);
}
/** Gets the current count of font style elts in the stack */
size_t count() const {return nfonts_;} /// Gets the current number of fonts in the stack
/** Gets the current count of font style elements in the stack. */
size_t count() const {return nfonts_;} // Gets the current number of fonts in the stack
protected:
size_t nfonts_; ///< current number of fonts in stack
@ -148,7 +148,7 @@ struct Fl_Help_Target
elements are supported, as well as a primitive implementation of tables.
GIF, JPEG, and PNG images are displayed inline.
*/
class FL_EXPORT Fl_Help_View : public Fl_Group //// Help viewer widget
class FL_EXPORT Fl_Help_View : public Fl_Group // Help viewer widget
{
enum { RIGHT = -1, CENTER, LEFT }; ///< Alignments
@ -234,10 +234,10 @@ public:
Fl_Help_View(int xx, int yy, int ww, int hh, const char *l = 0);
~Fl_Help_View();
/** This method returns the current directory for the text in the buffer. */
/** Returns the current directory for the text in the buffer. */
const char *directory() const { if (directory_[0]) return (directory_);
else return ((const char *)0); }
/** This method returns the current filename for the text in the buffer. */
/** Returns the current filename for the text in the buffer. */
const char *filename() const { if (filename_[0]) return (filename_);
else return ((const char *)0); }
int find(const char *s, int p = 0);
@ -266,7 +266,7 @@ public:
void link(Fl_Help_Func *fn) { link_ = fn; }
int load(const char *f);
void resize(int,int,int,int);
/** Gets the size of the Help view */
/** Gets the size of the help view. */
int size() const { return (size_); }
void size(int W, int H) { Fl_Widget::size(W, H); }
/** Sets the default text color. */
@ -288,9 +288,9 @@ public:
/** Returns the current top line in pixels. */
int topline() const { return (topline_); }
void leftline(int);
/** Gets the left position. */
/** Gets the left position in pixels. */
int leftline() const { return (leftline_); }
void value(const char *v);
void value(const char *val);
/** Returns the current buffer contents. */
const char *value() const { return (value_); }
void clear_selection();
@ -301,7 +301,7 @@ public:
If this value is zero (default), this widget will use the
Fl::scrollbar_size() value as the scrollbar's width.
\returns Scrollbar size in pixels, or 0 if the global Fl::scrollsize() is being used.
\returns Scrollbar size in pixels, or 0 if the global Fl::scrollbar_size() is being used.
\see Fl::scrollbar_size(int)
*/
int scrollbar_size() const {

200
src/Fl_Help_View.cxx
View File

@ -96,6 +96,11 @@ static int quote_char(const char *);
static void scrollbar_callback(Fl_Widget *s, void *);
static void hscrollbar_callback(Fl_Widget *s, void *);
//
// global flag for image loading (see get_image).
//
static char initial_load = 0;
//
// Broken image...
@ -273,7 +278,7 @@ void Fl_Help_View::hv_draw(const char *t, int x, int y)
}
/** Add a text block to the list. */
/** Adds a text block to the list. */
Fl_Help_Block * // O - Pointer to new block
Fl_Help_View::add_block(const char *s, // I - Pointer to start of block text
int xx, // I - X position of block
@ -314,7 +319,7 @@ Fl_Help_View::add_block(const char *s, // I - Pointer to start of block text
}
/** Add a new link to the list. */
/** Adds a new link to the list. */
void Fl_Help_View::add_link(const char *n, // I - Name of link
int xx, // I - X position of link
int yy, // I - Y position of link
@ -381,7 +386,7 @@ void Fl_Help_View::add_target(const char *n, // I - Name of target
ntargets_ ++;
}
/** Compare two targets.*/
/** Compares two targets.*/
int // O - Result of comparison
Fl_Help_View::compare_targets(const Fl_Help_Target *t0, // I - First target
const Fl_Help_Target *t1) // I - Second target
@ -389,7 +394,7 @@ Fl_Help_View::compare_targets(const Fl_Help_Target *t0, // I - First target
return (strcasecmp(t0->name, t1->name));
}
/** Compute the alignment for a line in a block.*/
/** Computes the alignment for a line in a block.*/
int // O - New line
Fl_Help_View::do_align(Fl_Help_Block *block, // I - Block to add to
int line, // I - Current line
@ -428,7 +433,7 @@ Fl_Help_View::do_align(Fl_Help_Block *block, // I - Block to add to
return (line);
}
/** Draw the Fl_Help_View widget.*/
/** Draws the Fl_Help_View widget. */
void
Fl_Help_View::draw()
{
@ -881,10 +886,6 @@ Fl_Help_View::draw()
if (img) {
img->draw(xx + x() - leftline_,
yy + y() - fl_height() + fl_descent() + 2);
#if !defined(WIN32) && !defined(__APPLE__)
if ((void*)img != &broken_image)
#endif
if(img->refcount()>0) img->release();
}
xx += ww;
@ -990,8 +991,10 @@ Fl_Help_View::draw()
/** Find the specified string s at starting position p, return the matching pos
or -1 if not found */
/** Finds the specified string \p s at starting position \p p.
\return the matching position or -1 if not found
*/
int // O - Matching position or -1 if not found
Fl_Help_View::find(const char *s, // I - String to find
int p) // I - Starting position
@ -1049,7 +1052,7 @@ Fl_Help_View::find(const char *s, // I - String to find
return (-1);
}
/** Format the help text.*/
/** Formats the help text. */
void Fl_Help_View::format() {
int i; // Looping var
int done; // Are we done yet?
@ -1864,7 +1867,7 @@ void Fl_Help_View::format() {
}
/** Format a table */
/** Formats a table */
void
Fl_Help_View::format_table(int *table_width, // O - Total table width
int *columns, // O - Column widths
@ -2298,7 +2301,7 @@ Fl_Help_View::format_table(int *table_width, // O - Total table width
}
/** Free memory used for the document. */
/** Frees memory used for the document. */
void
Fl_Help_View::free_data() {
// Release all images...
@ -2311,7 +2314,6 @@ Fl_Help_View::free_data() {
wattr[1024], // Width attribute buffer
hattr[1024]; // Height attribute buffer
for (ptr = value_; *ptr;)
{
if (*ptr == '<')
@ -2354,19 +2356,17 @@ Fl_Help_View::free_data() {
int width;
int height;
get_attr(attrs, "WIDTH", wattr, sizeof(wattr));
get_attr(attrs, "HEIGHT", hattr, sizeof(hattr));
width = get_length(wattr);
height = get_length(hattr);
if (get_attr(attrs, "SRC", attr, sizeof(attr))) {
// Release the image twice to free it from memory...
// Get and release the image to free it from memory...
img = get_image(attr, width, height);
#if !defined(__APPLE__)
if ((void*)img!=&broken_image)
#endif
while (img->refcount()>0) img->release();
if ((void*)img != &broken_image) {
img->release();
}
}
}
}
@ -2404,7 +2404,7 @@ Fl_Help_View::free_data() {
}
}
/** Get an alignment attribute. */
/** Gets an alignment attribute. */
int // O - Alignment
Fl_Help_View::get_align(const char *p, // I - Pointer to start of attrs
int a) // I - Default alignment
@ -2424,7 +2424,7 @@ Fl_Help_View::get_align(const char *p, // I - Pointer to start of attrs
}
/** Get an attribute value from the string. */
/** Gets an attribute value from the string. */
const char * // O - Pointer to buf or NULL
Fl_Help_View::get_attr(const char *p, // I - Pointer to start of attributes
const char *n, // I - Name of attribute
@ -2496,7 +2496,7 @@ Fl_Help_View::get_attr(const char *p, // I - Pointer to start of attributes
}
/** Get an alignment attribute. */
/** Gets a color attribute. */
Fl_Color // O - Color value
Fl_Help_View::get_color(const char *n, // I - Color name
Fl_Color c) // I - Default color value
@ -2555,7 +2555,48 @@ Fl_Help_View::get_color(const char *n, // I - Color name
}
/** Gets an inline image. */
/** Gets an inline image.
The image reference count is maintained accordingly, such that
the image can be released exactly once when the document is closed.
\return a pointer to a cached Fl_Shared_Image, if the image can be loaded,
otherwise a pointer to an internal Fl_Pixmap (broken_image).
\todo Fl_Help_View::get_image() returns a pointer to the internal
Fl_Pixmap broken_image, but this is _not_ compatible with the
return type Fl_Shared_Image (release() must not be called).
*/
/* Implementation note: (A.S. Apr 05, 2009)
Fl_Help_View::get_image() uses a static global flag (initial_load)
to determine, if it is called from the initial loading of a document
(load() or value()), or from resize() or draw().
A better solution would be to manage all loaded images in an own
structure like Fl_Help_Target (Fl_Help_Image ?) to avoid using this
global flag, but this would break the ABI !
This should be fixed in FLTK 1.3 !
If initial_load is true, then Fl_Shared_Image::get() is called to
load the image, and the reference count of the shared image is
increased by one.
If initial_load is false, then Fl_Shared_Image::find() is called to
load the image, and the image is released immediately. This avoids
increasing the reference count when calling get_image() from draw()
or resize().
Calling Fl_Shared_Image::find() instead of Fl_Shared_Image::get() avoids
doing unnecessary i/o for "broken images" within each resize/redraw.
Each image must be released exactly once in the destructor or before
a new document is loaded: see free_data().
*/
Fl_Shared_Image *
Fl_Help_View::get_image(const char *name, int W, int H) {
const char *localname; // Local filename
@ -2596,8 +2637,17 @@ Fl_Help_View::get_image(const char *name, int W, int H) {
if (strncmp(localname, "file:", 5) == 0) localname += 5;
if ((ip = Fl_Shared_Image::get(localname, W, H)) == NULL)
if (initial_load) {
if ((ip = Fl_Shared_Image::get(localname, W, H)) == NULL) {
ip = (Fl_Shared_Image *)&broken_image;
}
} else { // draw or resize
if ((ip = Fl_Shared_Image::find(localname, W, H)) == NULL) {
ip = (Fl_Shared_Image *)&broken_image;
} else {
ip->release();
}
}
return ip;
}
@ -2640,6 +2690,7 @@ void Fl_Help_View::follow_link(Fl_Help_Link *linkp)
char target[32]; // Current target
clear_selection();
free_data();
strlcpy(target, linkp->name, sizeof(target));
@ -2699,7 +2750,7 @@ void Fl_Help_View::clear_selection()
if (current_view==this)
clear_global_selection();
}
/** Selects All the text in the view. */
/** Selects all the text in the view. */
void Fl_Help_View::select_all()
{
clear_global_selection();
@ -2886,7 +2937,7 @@ void Fl_Help_View::end_selection(int clipboard)
#define ctrl(x) ((x)&0x1f)
/** Handle events in the widget. */
/** Handles events in the widget. */
int // O - 1 if we handled it, 0 otherwise
Fl_Help_View::handle(int event) // I - Event to handle
{
@ -3034,23 +3085,24 @@ Fl_Help_View::Fl_Help_View(int xx, // I - Left position
}
/** Destroy a Fl_Help_View widget. */
Fl_Help_View::~Fl_Help_View()
/**
/** Destroys the Fl_Help_View widget.
The destructor destroys the widget and frees all memory that has been
allocated for the current file.
allocated for the current document.
*/
Fl_Help_View::~Fl_Help_View()
{
clear_selection();
free_data();
}
/** Load the specified file. */
/** Loads the specified file.
This method loads the specified file or URL.
*/
int // O - 0 on success, -1 on error
Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
/** This method loads the specified file or URL.*/
{
FILE *fp; // File to read from
long len; // Length of file
@ -3060,6 +3112,7 @@ Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
char error[1024]; // Error buffer
char newname[1024]; // New filename buffer
// printf("load(%s)\n",f); fflush(stdout);
if (strncmp(f, "ftp:", 4) == 0 ||
strncmp(f, "http:", 5) == 0 ||
@ -3083,6 +3136,8 @@ Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
if (!localname)
return (0);
free_data();
strlcpy(filename_, newname, sizeof(filename_));
strlcpy(directory_, newname, sizeof(directory_));
@ -3106,6 +3161,7 @@ Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
}
clear_selection();
free_data();
strlcpy(newname, f, sizeof(newname));
if ((target = strrchr(newname, '#')) != NULL)
@ -3129,12 +3185,6 @@ Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
else if (slash > directory_ && slash[-1] != '/')
*slash = '\0';
if (value_ != NULL)
{
free((void *)value_);
value_ = NULL;
}
if (strncmp(localname, "file:", 5) == 0)
localname += 5; // Adjust for local filename...
@ -3159,7 +3209,9 @@ Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
value_ = strdup(error);
}
initial_load = 1;
format();
initial_load = 0;
if (target)
topline(target);
@ -3170,7 +3222,7 @@ Fl_Help_View::load(const char *f)// I - Filename to load (may also have target)
}
/** Resize the help widget. */
/** Resizes the help widget. */
void
Fl_Help_View::resize(int xx, // I - New left position
@ -3195,7 +3247,10 @@ Fl_Help_View::resize(int xx, // I - New left position
}
/** Scroll the text to the indicated position, given a named destination */
/** Scrolls the text to the indicated position, given a named destination.
\param[in] n target name
*/
void
Fl_Help_View::topline(const char *n) // I - Target name
{
@ -3216,21 +3271,26 @@ Fl_Help_View::topline(const char *n) // I - Target name
}
/** Scrolls the text to the indicated position, given a pixel line.
/** Scroll the text to the indicated position, given a pixel line. */
If the given pixel value \p top is out of range, then the text is
scrolled to the top or bottom of the document, resp.
\param[in] top top line number in pixels (0 = start of document)
*/
void
Fl_Help_View::topline(int t) // I - Top line number
Fl_Help_View::topline(int top) // I - Top line number
{
if (!value_)
return;
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
if (size_ < (h() - scrollsize) || t < 0)
t = 0;
else if (t > size_)
t = size_;
if (size_ < (h() - scrollsize) || top < 0)
top = 0;
else if (top > size_)
top = size_;
topline_ = t;
topline_ = top;
scrollbar_.value(topline_, h() - scrollsize, 0, size_);
@ -3240,22 +3300,26 @@ Fl_Help_View::topline(int t) // I - Top line number
}
/** Scrolls the text to the indicated position, given a pixel column.
If the given pixel value \p left is out of range, then the text is
scrolled to the left or right side of the document, resp.
/** Sets the left position. */
\param[in] left left column number in pixels (0 = left side)
*/
void
Fl_Help_View::leftline(int l) // I - Left position
Fl_Help_View::leftline(int left) // I - Left position
{
if (!value_)
return;
int scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
if (hsize_ < (w() - scrollsize) || l < 0)
l = 0;
else if (l > hsize_)
l = hsize_;
if (hsize_ < (w() - scrollsize) || left < 0)
left = 0;
else if (left > hsize_)
left = hsize_;
leftline_ = l;
leftline_ = left;
hscrollbar_.value(leftline_, w() - scrollsize, 0, hsize_);
@ -3263,32 +3327,42 @@ Fl_Help_View::leftline(int l) // I - Left position
}
/** Sets the current help text buffer to the string provided and reformats the text. */
/** Sets the current help text buffer to the string provided and reformats the text.
The provided character string \p val is copied internally and will be
freed when value() is called again, or when the widget is destroyed.
If \p val is NULL, then the widget is cleared.
*/
void
Fl_Help_View::value(const char *v) // I - Text to view
Fl_Help_View::value(const char *val) // I - Text to view
{
clear_selection();
free_data();
set_changed();
if (!v)
if (!val)
return;
value_ = strdup(v);
value_ = strdup(val);
initial_load = 1;
format();
initial_load = 0;
topline(0);
leftline(0);
}
#ifdef ENC
# undef ENC
#endif
// part b in the table seems to be mac_roman - beku
# define ENC(a, b) a
/** Return the character code associated with a quoted char. */
/** Returns the character code associated with a quoted char. */
static int // O - Code or -1 on error
quote_char(const char *p) { // I - Quoted string
int i; // Looping var
@ -3418,7 +3492,7 @@ quote_char(const char *p) { // I - Quoted string
}
/** The scrollbar callback. */
/** The vertical scrollbar callback. */
static void
scrollbar_callback(Fl_Widget *s, void *)
{
@ -3426,7 +3500,7 @@ scrollbar_callback(Fl_Widget *s, void *)
}
/** The horizontal scrollbar callback . */
/** The horizontal scrollbar callback. */
static void
hscrollbar_callback(Fl_Widget *s, void *)
{