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|
#include "mupdf/fitz.h"
#include "mupdf/pdf.h"
#include <stdlib.h>
#include <string.h>
#include <limits.h>
int
pdf_count_pages(fz_context *ctx, pdf_document *doc)
{
if (doc->page_count == 0)
doc->page_count = pdf_to_int(ctx, pdf_dict_getp(ctx, pdf_trailer(ctx, doc), "Root/Pages/Count"));
return doc->page_count;
}
static int
pdf_load_page_tree_imp(fz_context *ctx, pdf_document *doc, pdf_obj *node, int idx)
{
pdf_obj *type = pdf_dict_get(ctx, node, PDF_NAME_Type);
if (pdf_name_eq(ctx, type, PDF_NAME_Pages))
{
pdf_obj *kids = pdf_dict_get(ctx, node, PDF_NAME_Kids);
int count = pdf_to_int(ctx, pdf_dict_get(ctx, node, PDF_NAME_Count));
int i, n = pdf_array_len(ctx, kids);
/* if Kids length is same as Count, all children must be page objects */
if (n == count)
{
for (i = 0; i < n; ++i)
{
if (idx >= doc->page_count)
fz_throw(ctx, FZ_ERROR_GENERIC, "too many kids in page tree");
doc->rev_page_map[idx].page = idx;
doc->rev_page_map[idx].object = pdf_to_num(ctx, pdf_array_get(ctx, kids, i));
++idx;
}
}
/* else Kids may contain intermediate nodes */
else
{
if (pdf_mark_obj(ctx, node))
fz_throw(ctx, FZ_ERROR_GENERIC, "cycle in page tree");
fz_try(ctx)
for (i = 0; i < n; ++i)
idx = pdf_load_page_tree_imp(ctx, doc, pdf_array_get(ctx, kids, i), idx);
fz_always(ctx)
pdf_unmark_obj(ctx, node);
fz_catch(ctx)
fz_rethrow(ctx);
}
}
else if (pdf_name_eq(ctx, type, PDF_NAME_Page))
{
if (idx >= doc->page_count)
fz_throw(ctx, FZ_ERROR_GENERIC, "too many kids in page tree");
doc->rev_page_map[idx].page = idx;
doc->rev_page_map[idx].object = pdf_to_num(ctx, node);
++idx;
}
else
{
fz_throw(ctx, FZ_ERROR_GENERIC, "non-page object in page tree");
}
return idx;
}
static int
cmp_rev_page_map(const void *va, const void *vb)
{
const pdf_rev_page_map *a = va;
const pdf_rev_page_map *b = vb;
return a->object - b->object;
}
void
pdf_load_page_tree(fz_context *ctx, pdf_document *doc)
{
if (!doc->rev_page_map)
{
int n = pdf_count_pages(ctx, doc);
doc->rev_page_map = fz_malloc_array(ctx, n, sizeof *doc->rev_page_map);
pdf_load_page_tree_imp(ctx, doc, pdf_dict_getp(ctx, pdf_trailer(ctx, doc), "Root/Pages"), 0);
qsort(doc->rev_page_map, n, sizeof *doc->rev_page_map, cmp_rev_page_map);
}
}
void
pdf_drop_page_tree(fz_context *ctx, pdf_document *doc)
{
fz_free(ctx, doc->rev_page_map);
doc->rev_page_map = NULL;
}
enum
{
LOCAL_STACK_SIZE = 16
};
static pdf_obj *
pdf_lookup_page_loc_imp(fz_context *ctx, pdf_document *doc, pdf_obj *node, int *skip, pdf_obj **parentp, int *indexp)
{
pdf_obj *kids;
pdf_obj *hit = NULL;
int i, len;
pdf_obj *local_stack[LOCAL_STACK_SIZE];
pdf_obj **stack = &local_stack[0];
int stack_max = LOCAL_STACK_SIZE;
int stack_len = 0;
fz_var(hit);
fz_var(stack);
fz_var(stack_len);
fz_var(stack_max);
fz_try(ctx)
{
do
{
kids = pdf_dict_get(ctx, node, PDF_NAME_Kids);
len = pdf_array_len(ctx, kids);
if (len == 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "malformed page tree");
/* Every node we need to unmark goes into the stack */
if (stack_len == stack_max)
{
if (stack == &local_stack[0])
{
stack = fz_malloc_array(ctx, stack_max * 2, sizeof(*stack));
memcpy(stack, &local_stack[0], stack_max * sizeof(*stack));
}
else
stack = fz_resize_array(ctx, stack, stack_max * 2, sizeof(*stack));
stack_max *= 2;
}
stack[stack_len++] = node;
if (pdf_mark_obj(ctx, node))
fz_throw(ctx, FZ_ERROR_GENERIC, "cycle in page tree");
for (i = 0; i < len; i++)
{
pdf_obj *kid = pdf_array_get(ctx, kids, i);
pdf_obj *type = pdf_dict_get(ctx, kid, PDF_NAME_Type);
if (type ? pdf_name_eq(ctx, type, PDF_NAME_Pages) : pdf_dict_get(ctx, kid, PDF_NAME_Kids) && !pdf_dict_get(ctx, kid, PDF_NAME_MediaBox))
{
int count = pdf_to_int(ctx, pdf_dict_get(ctx, kid, PDF_NAME_Count));
if (*skip < count)
{
node = kid;
break;
}
else
{
*skip -= count;
}
}
else
{
if (type ? !pdf_name_eq(ctx, type, PDF_NAME_Page) : !pdf_dict_get(ctx, kid, PDF_NAME_MediaBox))
fz_warn(ctx, "non-page object in page tree (%s)", pdf_to_name(ctx, type));
if (*skip == 0)
{
if (parentp) *parentp = node;
if (indexp) *indexp = i;
hit = kid;
break;
}
else
{
(*skip)--;
}
}
}
}
while (hit == NULL);
}
fz_always(ctx)
{
for (i = stack_len; i > 0; i--)
pdf_unmark_obj(ctx, stack[i-1]);
if (stack != &local_stack[0])
fz_free(ctx, stack);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
return hit;
}
pdf_obj *
pdf_lookup_page_loc(fz_context *ctx, pdf_document *doc, int needle, pdf_obj **parentp, int *indexp)
{
pdf_obj *root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
pdf_obj *node = pdf_dict_get(ctx, root, PDF_NAME_Pages);
int skip = needle;
pdf_obj *hit;
if (!node)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find page tree");
hit = pdf_lookup_page_loc_imp(ctx, doc, node, &skip, parentp, indexp);
if (!hit)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find page %d in page tree", needle);
return hit;
}
pdf_obj *
pdf_lookup_page_obj(fz_context *ctx, pdf_document *doc, int needle)
{
return pdf_lookup_page_loc(ctx, doc, needle, NULL, NULL);
}
static int
pdf_count_pages_before_kid(fz_context *ctx, pdf_document *doc, pdf_obj *parent, int kid_num)
{
pdf_obj *kids = pdf_dict_get(ctx, parent, PDF_NAME_Kids);
int i, total = 0, len = pdf_array_len(ctx, kids);
for (i = 0; i < len; i++)
{
pdf_obj *kid = pdf_array_get(ctx, kids, i);
if (pdf_to_num(ctx, kid) == kid_num)
return total;
if (pdf_name_eq(ctx, pdf_dict_get(ctx, kid, PDF_NAME_Type), PDF_NAME_Pages))
{
pdf_obj *count = pdf_dict_get(ctx, kid, PDF_NAME_Count);
int n = pdf_to_int(ctx, count);
if (!pdf_is_int(ctx, count) || n < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "illegal or missing count in pages tree");
total += n;
}
else
total++;
}
fz_throw(ctx, FZ_ERROR_GENERIC, "kid not found in parent's kids array");
}
static int
pdf_lookup_page_number_slow(fz_context *ctx, pdf_document *doc, pdf_obj *node)
{
int needle = pdf_to_num(ctx, node);
int total = 0;
pdf_obj *parent, *parent2;
if (!pdf_name_eq(ctx, pdf_dict_get(ctx, node, PDF_NAME_Type), PDF_NAME_Page))
fz_throw(ctx, FZ_ERROR_GENERIC, "invalid page object");
parent2 = parent = pdf_dict_get(ctx, node, PDF_NAME_Parent);
fz_var(parent);
fz_try(ctx)
{
while (pdf_is_dict(ctx, parent))
{
if (pdf_mark_obj(ctx, parent))
fz_throw(ctx, FZ_ERROR_GENERIC, "cycle in page tree (parents)");
total += pdf_count_pages_before_kid(ctx, doc, parent, needle);
needle = pdf_to_num(ctx, parent);
parent = pdf_dict_get(ctx, parent, PDF_NAME_Parent);
}
}
fz_always(ctx)
{
/* Run back and unmark */
while (parent2)
{
pdf_unmark_obj(ctx, parent2);
if (parent2 == parent)
break;
parent2 = pdf_dict_get(ctx, parent2, PDF_NAME_Parent);
}
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
return total;
}
static int
pdf_lookup_page_number_fast(fz_context *ctx, pdf_document *doc, int needle)
{
int l = 0;
int r = doc->page_count - 1;
while (l <= r)
{
int m = (l + r) >> 1;
int c = needle - doc->rev_page_map[m].object;
if (c < 0)
r = m - 1;
else if (c > 0)
l = m + 1;
else
return doc->rev_page_map[m].page;
}
return -1;
}
int
pdf_lookup_page_number(fz_context *ctx, pdf_document *doc, pdf_obj *page)
{
if (doc->rev_page_map)
return pdf_lookup_page_number_fast(ctx, doc, pdf_to_num(ctx, page));
else
return pdf_lookup_page_number_slow(ctx, doc, page);
}
int
pdf_lookup_anchor(fz_context *ctx, pdf_document *doc, const char *name, float *xp, float *yp)
{
pdf_obj *needle, *dest;
char *uri;
if (xp) *xp = 0;
if (yp) *yp = 0;
needle = pdf_new_string(ctx, doc, name, strlen(name));
fz_try(ctx)
dest = pdf_lookup_dest(ctx, doc, needle);
fz_always(ctx)
pdf_drop_obj(ctx, needle);
fz_catch(ctx)
fz_rethrow(ctx);
if (dest)
{
uri = pdf_parse_link_dest(ctx, doc, dest);
return pdf_resolve_link(ctx, doc, uri, xp, yp);
}
if (!strncmp(name, "page=", 5))
return fz_atoi(name + 5) - 1;
return fz_atoi(name) - 1;
}
static pdf_obj *
pdf_lookup_inherited_page_item(fz_context *ctx, pdf_obj *node, pdf_obj *key)
{
pdf_obj *node2 = node;
pdf_obj *val;
/* fz_var(node); Not required as node passed in */
fz_try(ctx)
{
do
{
val = pdf_dict_get(ctx, node, key);
if (val)
break;
if (pdf_mark_obj(ctx, node))
fz_throw(ctx, FZ_ERROR_GENERIC, "cycle in page tree (parents)");
node = pdf_dict_get(ctx, node, PDF_NAME_Parent);
}
while (node);
}
fz_always(ctx)
{
do
{
pdf_unmark_obj(ctx, node2);
if (node2 == node)
break;
node2 = pdf_dict_get(ctx, node2, PDF_NAME_Parent);
}
while (node2);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
return val;
}
static void
pdf_flatten_inheritable_page_item(fz_context *ctx, pdf_obj *page, pdf_obj *key)
{
pdf_obj *val = pdf_lookup_inherited_page_item(ctx, page, key);
if (val)
pdf_dict_put(ctx, page, key, val);
}
void
pdf_flatten_inheritable_page_items(fz_context *ctx, pdf_obj *page)
{
pdf_flatten_inheritable_page_item(ctx, page, PDF_NAME_MediaBox);
pdf_flatten_inheritable_page_item(ctx, page, PDF_NAME_CropBox);
pdf_flatten_inheritable_page_item(ctx, page, PDF_NAME_Rotate);
pdf_flatten_inheritable_page_item(ctx, page, PDF_NAME_Resources);
}
/* We need to know whether to install a page-level transparency group */
static int pdf_resources_use_blending(fz_context *ctx, pdf_obj *rdb);
static int
pdf_extgstate_uses_blending(fz_context *ctx, pdf_obj *dict)
{
pdf_obj *obj = pdf_dict_get(ctx, dict, PDF_NAME_BM);
if (obj && !pdf_name_eq(ctx, obj, PDF_NAME_Normal))
return 1;
return 0;
}
static int
pdf_pattern_uses_blending(fz_context *ctx, pdf_obj *dict)
{
pdf_obj *obj;
obj = pdf_dict_get(ctx, dict, PDF_NAME_Resources);
if (pdf_resources_use_blending(ctx, obj))
return 1;
obj = pdf_dict_get(ctx, dict, PDF_NAME_ExtGState);
return pdf_extgstate_uses_blending(ctx, obj);
}
static int
pdf_xobject_uses_blending(fz_context *ctx, pdf_obj *dict)
{
pdf_obj *obj = pdf_dict_get(ctx, dict, PDF_NAME_Resources);
if (pdf_name_eq(ctx, pdf_dict_getp(ctx, dict, "Group/S"), PDF_NAME_Transparency))
return 1;
return pdf_resources_use_blending(ctx, obj);
}
static int
pdf_resources_use_blending(fz_context *ctx, pdf_obj *rdb)
{
pdf_obj *obj;
int i, n, useBM = 0;
if (!rdb)
return 0;
/* Have we been here before and remembered an answer? */
if (pdf_obj_memo(ctx, rdb, &useBM))
return useBM;
/* stop on cyclic resource dependencies */
if (pdf_mark_obj(ctx, rdb))
return 0;
fz_try(ctx)
{
obj = pdf_dict_get(ctx, rdb, PDF_NAME_ExtGState);
n = pdf_dict_len(ctx, obj);
for (i = 0; i < n; i++)
if (pdf_extgstate_uses_blending(ctx, pdf_dict_get_val(ctx, obj, i)))
goto found;
obj = pdf_dict_get(ctx, rdb, PDF_NAME_Pattern);
n = pdf_dict_len(ctx, obj);
for (i = 0; i < n; i++)
if (pdf_pattern_uses_blending(ctx, pdf_dict_get_val(ctx, obj, i)))
goto found;
obj = pdf_dict_get(ctx, rdb, PDF_NAME_XObject);
n = pdf_dict_len(ctx, obj);
for (i = 0; i < n; i++)
if (pdf_xobject_uses_blending(ctx, pdf_dict_get_val(ctx, obj, i)))
goto found;
if (0)
{
found:
useBM = 1;
}
}
fz_always(ctx)
{
pdf_unmark_obj(ctx, rdb);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
pdf_set_obj_memo(ctx, rdb, useBM);
return useBM;
}
fz_transition *
pdf_page_presentation(fz_context *ctx, pdf_page *page, fz_transition *transition, float *duration)
{
pdf_obj *obj, *transdict;
*duration = pdf_to_real(ctx, pdf_dict_get(ctx, page->obj, PDF_NAME_Dur));
transdict = pdf_dict_get(ctx, page->obj, PDF_NAME_Trans);
if (!transdict)
return NULL;
obj = pdf_dict_get(ctx, transdict, PDF_NAME_D);
transition->duration = (obj ? pdf_to_real(ctx, obj) : 1);
transition->vertical = !pdf_name_eq(ctx, pdf_dict_get(ctx, transdict, PDF_NAME_Dm), PDF_NAME_H);
transition->outwards = !pdf_name_eq(ctx, pdf_dict_get(ctx, transdict, PDF_NAME_M), PDF_NAME_I);
/* FIXME: If 'Di' is None, it should be handled differently, but
* this only affects Fly, and we don't implement that currently. */
transition->direction = (pdf_to_int(ctx, pdf_dict_get(ctx, transdict, PDF_NAME_Di)));
/* FIXME: Read SS for Fly when we implement it */
/* FIXME: Read B for Fly when we implement it */
obj = pdf_dict_get(ctx, transdict, PDF_NAME_S);
if (pdf_name_eq(ctx, obj, PDF_NAME_Split))
transition->type = FZ_TRANSITION_SPLIT;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Blinds))
transition->type = FZ_TRANSITION_BLINDS;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Box))
transition->type = FZ_TRANSITION_BOX;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Wipe))
transition->type = FZ_TRANSITION_WIPE;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Dissolve))
transition->type = FZ_TRANSITION_DISSOLVE;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Glitter))
transition->type = FZ_TRANSITION_GLITTER;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Fly))
transition->type = FZ_TRANSITION_FLY;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Push))
transition->type = FZ_TRANSITION_PUSH;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Cover))
transition->type = FZ_TRANSITION_COVER;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Uncover))
transition->type = FZ_TRANSITION_UNCOVER;
else if (pdf_name_eq(ctx, obj, PDF_NAME_Fade))
transition->type = FZ_TRANSITION_FADE;
else
transition->type = FZ_TRANSITION_NONE;
return transition;
}
fz_rect *
pdf_bound_page(fz_context *ctx, pdf_page *page, fz_rect *mediabox)
{
fz_matrix page_ctm;
pdf_page_transform(ctx, page, mediabox, &page_ctm);
fz_transform_rect(mediabox, &page_ctm);
return mediabox;
}
fz_link *
pdf_load_links(fz_context *ctx, pdf_page *page)
{
return fz_keep_link(ctx, page->links);
}
pdf_obj *
pdf_page_resources(fz_context *ctx, pdf_page *page)
{
return pdf_lookup_inherited_page_item(ctx, page->obj, PDF_NAME_Resources);
}
pdf_obj *
pdf_page_contents(fz_context *ctx, pdf_page *page)
{
return pdf_dict_get(ctx, page->obj, PDF_NAME_Contents);
}
void
pdf_page_obj_transform(fz_context *ctx, pdf_obj *pageobj, fz_rect *page_mediabox, fz_matrix *page_ctm)
{
pdf_obj *obj;
fz_rect mediabox, cropbox, realbox, pagebox;
fz_matrix tmp;
float userunit = 1;
int rotate;
if (!page_mediabox)
page_mediabox = &pagebox;
obj = pdf_dict_get(ctx, pageobj, PDF_NAME_UserUnit);
if (pdf_is_real(ctx, obj))
userunit = pdf_to_real(ctx, obj);
pdf_to_rect(ctx, pdf_lookup_inherited_page_item(ctx, pageobj, PDF_NAME_MediaBox), &mediabox);
if (fz_is_empty_rect(&mediabox))
{
mediabox.x0 = 0;
mediabox.y0 = 0;
mediabox.x1 = 612;
mediabox.y1 = 792;
}
pdf_to_rect(ctx, pdf_lookup_inherited_page_item(ctx, pageobj, PDF_NAME_CropBox), &cropbox);
if (!fz_is_empty_rect(&cropbox))
fz_intersect_rect(&mediabox, &cropbox);
page_mediabox->x0 = fz_min(mediabox.x0, mediabox.x1);
page_mediabox->y0 = fz_min(mediabox.y0, mediabox.y1);
page_mediabox->x1 = fz_max(mediabox.x0, mediabox.x1);
page_mediabox->y1 = fz_max(mediabox.y0, mediabox.y1);
if (page_mediabox->x1 - page_mediabox->x0 < 1 || page_mediabox->y1 - page_mediabox->y0 < 1)
*page_mediabox = fz_unit_rect;
rotate = pdf_to_int(ctx, pdf_lookup_inherited_page_item(ctx, pageobj, PDF_NAME_Rotate));
/* Snap page rotation to 0, 90, 180 or 270 */
if (rotate < 0)
rotate = 360 - ((-rotate) % 360);
if (rotate >= 360)
rotate = rotate % 360;
rotate = 90*((rotate + 45)/90);
if (rotate >= 360)
rotate = 0;
/* Compute transform from fitz' page space (upper left page origin, y descending, 72 dpi)
* to PDF user space (arbitrary page origin, y ascending, UserUnit dpi). */
/* Make left-handed and scale by UserUnit */
fz_scale(page_ctm, userunit, -userunit);
/* Rotate */
fz_pre_rotate(page_ctm, -rotate);
/* Translate page origin to 0,0 */
realbox = *page_mediabox;
fz_transform_rect(&realbox, page_ctm);
fz_translate(&tmp, -realbox.x0, -realbox.y0);
fz_concat(page_ctm, page_ctm, &tmp);
}
void
pdf_page_transform(fz_context *ctx, pdf_page *page, fz_rect *page_mediabox, fz_matrix *page_ctm)
{
pdf_page_obj_transform(ctx, page->obj, page_mediabox, page_ctm);
}
static void
pdf_drop_page_imp(fz_context *ctx, pdf_page *page)
{
pdf_document *doc = page->doc;
fz_drop_link(ctx, page->links);
pdf_drop_annots(ctx, page->annots);
/* doc->focus, when not NULL, refers to one of
* the annotations and must be NULLed when the
* annotations are destroyed. doc->focus_obj
* keeps track of the actual annotation object. */
doc->focus = NULL;
pdf_drop_obj(ctx, page->obj);
fz_drop_document(ctx, &page->doc->super);
}
static pdf_page *
pdf_new_page(fz_context *ctx, pdf_document *doc)
{
pdf_page *page = fz_new_derived_page(ctx, pdf_page);
page->doc = (pdf_document*) fz_keep_document(ctx, &doc->super);
page->super.drop_page = (fz_page_drop_page_fn*)pdf_drop_page_imp;
page->super.load_links = (fz_page_load_links_fn*)pdf_load_links;
page->super.bound_page = (fz_page_bound_page_fn*)pdf_bound_page;
page->super.first_annot = (fz_page_first_annot_fn*)pdf_first_annot;
page->super.run_page_contents = (fz_page_run_page_contents_fn*)pdf_run_page_contents;
page->super.page_presentation = (fz_page_page_presentation_fn*)pdf_page_presentation;
page->obj = NULL;
page->transparency = 0;
page->links = NULL;
page->annots = NULL;
page->annot_tailp = &page->annots;
page->incomplete = 0;
return page;
}
pdf_page *
pdf_load_page(fz_context *ctx, pdf_document *doc, int number)
{
pdf_page *page;
pdf_annot *annot;
pdf_obj *pageobj, *obj;
if (doc->file_reading_linearly)
{
pageobj = pdf_progressive_advance(ctx, doc, number);
if (pageobj == NULL)
fz_throw(ctx, FZ_ERROR_TRYLATER, "page %d not available yet", number);
}
else
pageobj = pdf_lookup_page_obj(ctx, doc, number);
page = pdf_new_page(ctx, doc);
page->obj = pdf_keep_obj(ctx, pageobj);
/* Pre-load annotations and links */
fz_try(ctx)
{
obj = pdf_dict_get(ctx, pageobj, PDF_NAME_Annots);
if (obj)
{
fz_rect page_mediabox;
fz_matrix page_ctm;
pdf_page_transform(ctx, page, &page_mediabox, &page_ctm);
page->links = pdf_load_link_annots(ctx, doc, obj, number, &page_ctm);
pdf_load_annots(ctx, page, obj);
}
}
fz_catch(ctx)
{
if (fz_caught(ctx) != FZ_ERROR_TRYLATER)
{
fz_drop_page(ctx, &page->super);
fz_rethrow(ctx);
}
page->incomplete |= PDF_PAGE_INCOMPLETE_ANNOTS;
fz_drop_link(ctx, page->links);
page->links = NULL;
}
/* Scan for transparency */
fz_try(ctx)
{
pdf_obj *resources = pdf_page_resources(ctx, page);
if (pdf_resources_use_blending(ctx, resources))
page->transparency = 1;
else if (pdf_name_eq(ctx, pdf_dict_getp(ctx, pageobj, "Group/S"), PDF_NAME_Transparency))
page->transparency = 1;
for (annot = page->annots; annot && !page->transparency; annot = annot->next)
if (annot->ap && pdf_resources_use_blending(ctx, pdf_xobject_resources(ctx, annot->ap)))
page->transparency = 1;
}
fz_catch(ctx)
{
if (fz_caught(ctx) != FZ_ERROR_TRYLATER)
{
fz_drop_page(ctx, &page->super);
fz_rethrow(ctx);
}
page->incomplete |= PDF_PAGE_INCOMPLETE_CONTENTS;
}
return page;
}
void
pdf_delete_page(fz_context *ctx, pdf_document *doc, int at)
{
pdf_obj *parent, *kids;
int i;
pdf_lookup_page_loc(ctx, doc, at, &parent, &i);
kids = pdf_dict_get(ctx, parent, PDF_NAME_Kids);
pdf_array_delete(ctx, kids, i);
while (parent)
{
int count = pdf_to_int(ctx, pdf_dict_get(ctx, parent, PDF_NAME_Count));
pdf_dict_put_drop(ctx, parent, PDF_NAME_Count, pdf_new_int(ctx, doc, count - 1));
parent = pdf_dict_get(ctx, parent, PDF_NAME_Parent);
}
doc->page_count = 0; /* invalidate cached value */
}
void
pdf_delete_page_range(fz_context *ctx, pdf_document *doc, int start, int end)
{
int count = pdf_count_pages(ctx, doc);
if (end < 0 || end > count)
end = count+1;
if (start < 0)
start = 0;
while (start < end)
{
pdf_delete_page(ctx, doc, start);
end--;
}
}
pdf_obj *
pdf_add_page(fz_context *ctx, pdf_document *doc, const fz_rect *mediabox, int rotate, pdf_obj *resources, fz_buffer *contents)
{
pdf_obj *page_obj = pdf_new_dict(ctx, doc, 5);
fz_try(ctx)
{
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_Type, PDF_NAME_Page);
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_MediaBox, pdf_new_rect(ctx, doc, mediabox));
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_Rotate, pdf_new_int(ctx, doc, rotate));
if (pdf_is_indirect(ctx, resources))
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_Resources, resources);
else if (pdf_is_dict(ctx, resources))
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_Resources, pdf_add_object(ctx, doc, resources));
else
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_Resources, pdf_new_dict(ctx, doc, 1));
if (contents)
pdf_dict_put_drop(ctx, page_obj, PDF_NAME_Contents, pdf_add_stream(ctx, doc, contents, NULL, 0));
}
fz_catch(ctx)
{
pdf_drop_obj(ctx, page_obj);
fz_rethrow(ctx);
}
return pdf_add_object_drop(ctx, doc, page_obj);
}
void
pdf_insert_page(fz_context *ctx, pdf_document *doc, int at, pdf_obj *page_ref)
{
int count = pdf_count_pages(ctx, doc);
pdf_obj *parent, *kids;
int i;
if (at < 0)
at = count;
if (at == INT_MAX)
at = count;
if (at > count)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot insert page beyond end of page tree");
if (count == 0)
{
pdf_obj *root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
parent = pdf_dict_get(ctx, root, PDF_NAME_Pages);
if (!parent)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find page tree");
kids = pdf_dict_get(ctx, parent, PDF_NAME_Kids);
if (!kids)
fz_throw(ctx, FZ_ERROR_GENERIC, "malformed page tree");
pdf_array_insert(ctx, kids, page_ref, 0);
}
else if (at == count)
{
/* append after last page */
pdf_lookup_page_loc(ctx, doc, count - 1, &parent, &i);
kids = pdf_dict_get(ctx, parent, PDF_NAME_Kids);
pdf_array_insert(ctx, kids, page_ref, i + 1);
}
else
{
/* insert before found page */
pdf_lookup_page_loc(ctx, doc, at, &parent, &i);
kids = pdf_dict_get(ctx, parent, PDF_NAME_Kids);
pdf_array_insert(ctx, kids, page_ref, i);
}
pdf_dict_put(ctx, page_ref, PDF_NAME_Parent, parent);
/* Adjust page counts */
while (parent)
{
int count = pdf_to_int(ctx, pdf_dict_get(ctx, parent, PDF_NAME_Count));
pdf_dict_put_drop(ctx, parent, PDF_NAME_Count, pdf_new_int(ctx, doc, count + 1));
parent = pdf_dict_get(ctx, parent, PDF_NAME_Parent);
}
doc->page_count = 0; /* invalidate cached value */
}
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