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#import <UIKit/UIKit.h>
#undef ABS
#undef MIN
#undef MAX
#include "fitz/fitz.h"
#include "pdf/mupdf.h"
#include "xps/muxps.h"
#define GAP 0
static dispatch_queue_t queue;
static fz_glyph_cache *glyphcache = NULL;
static UIImage *loadingImage = nil;
@interface MuLibraryController : UITableViewController
{
NSArray *files;
}
- (void) reload;
@end
@interface MuOutlineController : UITableViewController
{
id target;
NSMutableArray *titles;
NSMutableArray *pages;
}
- (id) initWithTarget: (id)aTarget titles: (NSMutableArray*)aTitles pages: (NSMutableArray*)aPages;
@end
@interface MuDocumentController : UIViewController <UIScrollViewDelegate>
{
pdf_xref *xref;
MuOutlineController *outline;
UIScrollView *canvas;
UIImageView **pageviews;
int width; // current screen size
int height;
int current; // currently visible page
}
- (id) initWithFile: (NSString*)filename;
- (void) loadPage: (int)number;
- (void) reloadPage: (int)number;
- (void) unloadPage: (int)number;
- (void) layoutPage: (int)number;
- (void) gotoPage: (int)number animated: (BOOL)animated;
- (void) didSingleTap: (UITapGestureRecognizer*)sender;
- (void) showOutline: (id)sender;
@end
@interface MuAppDelegate : NSObject <UIApplicationDelegate, UINavigationControllerDelegate>
{
UIWindow *window;
UINavigationController *navigator;
MuLibraryController *library;
}
@end
#pragma mark -
static void showAlert(NSString *msg)
{
char msgbuf[160 * 30];
int i;
fz_strlcpy(msgbuf, "", sizeof msgbuf);
for (i = 0; i < fz_get_error_count(); i++)
{
char *s = fz_get_error_line(i);
s = strstr(s, "(): ") + 4;
fz_strlcat(msgbuf, s, sizeof msgbuf);
fz_strlcat(msgbuf, "\n", sizeof msgbuf);
}
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle: msg
message: [NSString stringWithUTF8String: msgbuf]
delegate: nil
cancelButtonTitle: @"Okay"
otherButtonTitles: nil];
[alert show];
[alert release];
}
static int pageNumberFromLink(pdf_xref *xref, pdf_link *link)
{
if (link->kind == PDF_LINK_GOTO)
return pdf_find_page_number(xref, fz_array_get(link->dest, 0));
return -1;
}
static void loadOutlineImp(NSMutableArray *titles, NSMutableArray *pages, pdf_xref *xref, pdf_outline *outline, int level)
{
char buf[512];
memset(buf, 0, sizeof buf);
memset(buf, ' ', level * 4);
while (outline)
{
int number = pageNumberFromLink(xref, outline->link);
if (number >= 0) {
[titles addObject: [NSString stringWithFormat: @"%s%s", buf, outline->title]];
[pages addObject: [NSNumber numberWithInt: number]];
}
loadOutlineImp(titles, pages, xref, outline->child, level + 1);
outline = outline->next;
}
}
static void loadOutline(NSMutableArray *titles, NSMutableArray *pages, pdf_xref *xref)
{
pdf_outline *outline = pdf_load_outline(xref);
if (outline) {
loadOutlineImp(titles, pages, xref, outline, 0);
pdf_free_outline(outline);
}
}
static void releasePixmap(void *info, const void *data, size_t size)
{
fz_drop_pixmap(info);
}
static UIImage *newImageWithPixmap(fz_pixmap *pix)
{
CGDataProviderRef cgdata = CGDataProviderCreateWithData(pix, pix->samples, pix->w * 4 * pix->h, releasePixmap);
CGImageRef cgimage = CGImageCreate(pix->w, pix->h, 8, 32, 4 * pix->w,
CGColorSpaceCreateDeviceRGB(),
kCGBitmapByteOrderDefault,
cgdata, NULL, NO, kCGRenderingIntentDefault);
UIImage *image = [[UIImage alloc] initWithCGImage: cgimage];
CGDataProviderRelease(cgdata);
CGImageRelease(cgimage);
return image;
}
static UIImage *renderPage(pdf_xref *xref, int number, float width, float height)
{
fz_bbox bbox;
fz_matrix ctm;
fz_device *dev;
fz_pixmap *pix;
pdf_page *page;
fz_error error;
float scale, hscale, vscale;
printf("loading page %d for size %g x %g\n", number, width, height);
error = pdf_load_page(&page, xref, number);
if (error) {
showAlert(@"Cannot load page");
return nil;
}
hscale = width / page->mediabox.x1 - page->mediabox.x0;
vscale = height / page->mediabox.y1 - page->mediabox.y0;
scale = MIN(hscale, vscale);
ctm = fz_translate(0, -page->mediabox.y1);
ctm = fz_concat(ctm, fz_scale(scale, -scale));
ctm = fz_concat(ctm, fz_rotate(page->rotate));
bbox = fz_round_rect(fz_transform_rect(ctm, page->mediabox));
pix = fz_new_pixmap_with_rect(fz_device_rgb, bbox);
fz_clear_pixmap_with_color(pix, 255);
dev = fz_new_draw_device(glyphcache, pix);
pdf_run_page(xref, page, dev, ctm);
fz_free_device(dev);
pdf_free_page(page);
pdf_age_store(xref->store, 3);
fz_flush_warnings();
return newImageWithPixmap(pix);
}
#pragma mark -
@implementation MuLibraryController
- (void) reload
{
[self setTitle: @"MuPDF"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docdir = [paths objectAtIndex: 0];
NSError *error = nil;
if (files) {
[files release];
files = nil;
}
files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath: docdir error: &error];
if (error)
files = paths;
[files retain];
[[self tableView] reloadData];
}
- (void) dealloc
{
[files release];
[super dealloc];
}
- (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)o
{
return YES;
}
- (NSInteger) numberOfSectionsInTableView: (UITableView*)tableView
{
return 1;
}
- (NSInteger) tableView: (UITableView*)tableView numberOfRowsInSection: (NSInteger)section
{
return [files count];
}
- (UITableViewCell*) tableView: (UITableView*)tableView cellForRowAtIndexPath: (NSIndexPath*)indexPath
{
static NSString *cellid = @"MuCellIdent";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: cellid];
if (!cell)
cell = [[[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: cellid] autorelease];
NSString *value = [files objectAtIndex: [indexPath row]];
[[cell textLabel] setText: value];
return cell;
}
- (void) tableView: (UITableView*)tableView didSelectRowAtIndexPath: (NSIndexPath*)indexPath
{
NSString *filename = [files objectAtIndex: [indexPath row]];
MuDocumentController *document = [[MuDocumentController alloc] initWithFile: filename];
if (document) {
[[self navigationController] pushViewController: document animated: YES];
[document release];
}
}
@end
#pragma mark -
@implementation MuOutlineController
- (id) initWithTarget: (id)aTarget titles: (NSMutableArray*)aTitles pages: (NSMutableArray*)aPages
{
self = [super initWithStyle: UITableViewStylePlain];
if (self) {
[self setTitle: @"Table of Contents"];
target = [aTarget retain];
titles = [aTitles retain];
pages = [aPages retain];
}
return self;
}
- (void) dealloc
{
[target release];
[titles release];
[pages release];
[super dealloc];
}
- (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)o
{
return YES;
}
- (NSInteger) numberOfSectionsInTableView: (UITableView*)tableView
{
return 1;
}
- (NSInteger) tableView: (UITableView*)tableView numberOfRowsInSection: (NSInteger)section
{
return [titles count];
}
- (UITableViewCell*) tableView: (UITableView*)tableView cellForRowAtIndexPath: (NSIndexPath*)indexPath
{
static NSString *cellid = @"MuCellIdent";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: cellid];
if (!cell)
cell = [[[UITableViewCell alloc] initWithStyle: UITableViewCellStyleValue1 reuseIdentifier: cellid] autorelease];
NSString *title = [titles objectAtIndex: [indexPath row]];
NSString *page = [pages objectAtIndex: [indexPath row]];
[[cell textLabel] setText: title];
[[cell detailTextLabel] setText: [NSString stringWithFormat: @"%d", [page intValue]+1]];
return cell;
}
- (void) tableView: (UITableView*)tableView didSelectRowAtIndexPath: (NSIndexPath*)indexPath
{
NSNumber *page = [pages objectAtIndex: [indexPath row]];
[target gotoPage: [page intValue] animated: NO];
[[self navigationController] popViewControllerAnimated: YES];
}
@end
#pragma mark -
@implementation MuDocumentController
- (id) initWithFile: (NSString*)nsfilename
{
fz_error error;
char filename[PATH_MAX];
char *password = "";
self = [super init];
if (!self)
return nil;
// make sure we're not doing any background processing
dispatch_sync(queue, ^{});
strcpy(filename, [NSHomeDirectory() UTF8String]);
strcat(filename, "/Documents/");
strcat(filename, [nsfilename UTF8String]);
printf("open xref '%s'\n", filename);
error = pdf_open_xref(&xref, filename, password);
if (error) {
showAlert(@"Cannot open PDF file");
[self release];
return nil;
}
error = pdf_load_page_tree(xref);
if (error) {
showAlert(@"Cannot open document");
[self release];
return nil;
}
pageviews = calloc(pdf_count_pages(xref), sizeof *pageviews);
canvas = [[UIScrollView alloc] initWithFrame: CGRectMake(0,0,10,10)];
[canvas setPagingEnabled: YES];
[canvas setShowsHorizontalScrollIndicator: NO];
[canvas setShowsVerticalScrollIndicator: NO];
[canvas setDelegate: self];
[self setView: canvas];
[canvas addGestureRecognizer: [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(didSingleTap:)]];
[self setTitle: nsfilename];
NSMutableArray *titles = [[NSMutableArray alloc] init];
NSMutableArray *pages = [[NSMutableArray alloc] init];
loadOutline(titles, pages, xref);
if ([titles count]) {
outline = [[MuOutlineController alloc] initWithTarget: self titles: titles pages: pages];
[[outline tableView] setSeparatorStyle: UITableViewCellSeparatorStyleNone];
[[self navigationItem] setRightBarButtonItem:
[[UIBarButtonItem alloc]
initWithBarButtonSystemItem: UIBarButtonSystemItemBookmarks
target:self action:@selector(showOutline:)]];
}
[titles release];
[pages release];
return self;
}
- (void) dealloc
{
for (int i = 0; i < pdf_count_pages(xref); i++)
if (pageviews[i])
[pageviews[i] release];
pdf_xref *self_xref = xref; // don't use self after dealloc has finished
dispatch_async(queue, ^{
printf("close xref\n");
if (self_xref)
pdf_free_xref(self_xref);
});
free(pageviews);
[outline release];
[canvas release];
[super dealloc];
}
- (void) loadPage: (int)number
{
if (number < 0 || number >= pdf_count_pages(xref))
return;
if (!pageviews[number]) {
pageviews[number] = [[UIImageView alloc] initWithImage: loadingImage];
[pageviews[number] setCenter: CGPointMake(number * width + width / 2, height / 2)];
[canvas addSubview: pageviews[number]];
[self reloadPage: number];
}
}
- (void) unloadPage: (int)number
{
if (number < 0 || number >= pdf_count_pages(xref))
return;
if (pageviews[number]) {
[pageviews[number] removeFromSuperview];
[pageviews[number] release];
pageviews[number] = nil;
}
}
- (void) reloadPage: (int)number
{
if (number < 0 || number >= pdf_count_pages(xref))
return;
dispatch_async(queue, ^{
if (pageviews[number]) {
UIImage *image = renderPage(xref, number, width - GAP, height);
dispatch_async(dispatch_get_main_queue(), ^{
if (pageviews[number]) {
[pageviews[number] setImage: image];
[self layoutPage: number];
}
[image release];
});
}
});
}
- (void) layoutPage: (int)number
{
if (pageviews[number]) {
UIImageView *page = pageviews[number];
UIImage *image = [page image];
if (image != loadingImage) {
CGRect frame = [page frame];
CGSize pagesize = [image size];
float scale = MIN((width - GAP) / pagesize.width, height / pagesize.height);
if (fabs(scale - 1) > 0.1) {
[self reloadPage: number];
frame.size.width = pagesize.width * scale;
frame.size.height = pagesize.height * scale;
frame.origin.x = number * width;
frame.origin.y = 0;
frame.origin.x += (width - frame.size.width) / 2;
frame.origin.y += (height - frame.size.height) / 2;
[page setFrame: frame];
} else {
[page sizeToFit];
[page setCenter: CGPointMake(number * width + width/2, height/2)];
}
} else {
[page sizeToFit];
[page setCenter: CGPointMake(number * width + width/2, height/2)];
}
}
}
- (void) viewWillAppear: (BOOL)animated
{
CGSize size = [canvas frame].size;
width = size.width;
height = size.height;
[canvas setContentInset: UIEdgeInsetsZero];
[canvas setContentSize: CGSizeMake(pdf_count_pages(xref) * width, height)];
[canvas setContentOffset: CGPointMake(current * width, 0)];
}
- (void) scrollViewWillBeginDragging: (UIScrollView *)scrollView
{
if (![[self navigationController] isNavigationBarHidden]) {
[[self navigationController] setNavigationBarHidden: YES animated: YES];
[canvas setContentInset: UIEdgeInsetsZero];
}
}
- (void) scrollViewDidScroll: (UIScrollView*)scrollview
{
if (width == 0)
return; // not visible yet
float x = [canvas contentOffset].x + width * 0.5f;
int number = x / width;
#if 0
for (int i = 0; i < pdf_count_pages(xref); i++)
if (i != number)
[self unloadPage: i];
[self loadPage: number];
#else
for (int i = 0; i < pdf_count_pages(xref); i++)
if (i < number - 2 || i > number + 2)
[self unloadPage: i];
[self loadPage: number];
[self loadPage: number + 1];
[self loadPage: number - 1];
#endif
current = number;
}
- (void) gotoPage: (int)number animated: (BOOL)animated
{
if (number < 0)
number = 0;
if (number >= pdf_count_pages(xref))
number = pdf_count_pages(xref) - 1;
current = number;
[canvas setContentOffset: CGPointMake(current * width, 0) animated: animated];
}
- (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)o
{
return YES;
}
- (void) willAnimateRotationToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration
{
CGSize size = [canvas frame].size;
int max_width = MAX(width, size.width);
width = size.width;
height = size.height;
[self layoutPage: current]; // make sure current page is first in queue
for (int i = 0; i < pdf_count_pages(xref); i++)
if (i != current)
[self layoutPage: i];
// use max_width so we don't clamp the content offset too early during animation
[canvas setContentInset: UIEdgeInsetsZero];
[canvas setContentSize: CGSizeMake(pdf_count_pages(xref) * max_width, height)];
[canvas setContentOffset: CGPointMake(current * width, 0)];
}
- (void) didRotateFromInterfaceOrientation: (UIInterfaceOrientation)o
{
[canvas setContentInset: UIEdgeInsetsZero];
[canvas setContentSize: CGSizeMake(pdf_count_pages(xref) * width, height)];
[canvas setContentOffset: CGPointMake(current * width, 0)];
}
- (void) didSingleTap: (UITapGestureRecognizer*)sender
{
CGPoint p = [sender locationInView: canvas];
CGPoint ofs = [canvas contentOffset];
float x0 = width / 5;
float x1 = width - x0;
p.x -= ofs.x;
p.y -= ofs.y;
if (p.x < x0)
[self gotoPage: current - 1 animated: YES];
else if (p.x > x1)
[self gotoPage: current + 1 animated: YES];
else {
UINavigationController *navigator = [self navigationController];
if ([navigator isNavigationBarHidden])
[navigator setNavigationBarHidden: NO animated: YES];
else
[navigator setNavigationBarHidden: YES animated: YES];
[canvas setContentInset: UIEdgeInsetsZero];
}
}
- (void) showOutline: (id)sender
{
[[self navigationController] pushViewController: outline animated: YES];
}
@end
#pragma mark -
@implementation MuAppDelegate
- (BOOL) application: (UIApplication*)application didFinishLaunchingWithOptions: (NSDictionary*)launchOptions
{
queue = dispatch_queue_create("com.artifex.mupdf.queue", NULL);
glyphcache = fz_new_glyph_cache();
loadingImage = [[UIImage imageNamed: @"loading.png"] retain];
library = [[MuLibraryController alloc] initWithStyle: UITableViewStylePlain];
navigator = [[UINavigationController alloc] initWithRootViewController: library];
[[navigator navigationBar] setTranslucent: YES];
[navigator setDelegate: self];
window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
[window setBackgroundColor: [UIColor scrollViewTexturedBackgroundColor]];
[window addSubview: [navigator view]];
[window makeKeyAndVisible];
return YES;
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
printf("applicationDidEnterBackground!\n");
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
printf("applicationWillEnterForeground!\n");
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
printf("applicationDidBecomeActive!\n");
[library reload];
}
- (void)applicationWillTerminate:(UIApplication *)application
{
printf("applicationWillTerminate!\n");
}
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
printf("applicationDidReceiveMemoryWarning\n");
}
- (void) dealloc
{
dispatch_release(queue);
[library release];
[navigator release];
[window release];
[super dealloc];
}
@end
#pragma mark -
int main(int argc, char *argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"MuAppDelegate");
[pool release];
return retVal;
}
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