diff options
Diffstat (limited to 'platform/wasm/wrap.c')
| -rw-r--r-- | platform/wasm/wrap.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/platform/wasm/wrap.c b/platform/wasm/wrap.c new file mode 100644 index 00000000..d2a3379e --- /dev/null +++ b/platform/wasm/wrap.c @@ -0,0 +1,247 @@ +#include "emscripten.h" +#include "mupdf/fitz.h" + +static fz_context *ctx; + +EMSCRIPTEN_KEEPALIVE +void initContext(void) +{ + ctx = fz_new_context(NULL, NULL, 100<<20); + fz_register_document_handlers(ctx); +} + +EMSCRIPTEN_KEEPALIVE +fz_document *openDocument(const char *filename) +{ + return fz_open_document(ctx, filename); +} + +EMSCRIPTEN_KEEPALIVE +void freeDocument(fz_document *doc) +{ + fz_drop_document(ctx, doc); +} + +EMSCRIPTEN_KEEPALIVE +int countPages(fz_document *doc) +{ + return fz_count_pages(ctx, doc); +} + +static fz_page *lastPage = NULL; + +static void loadPage(fz_document *doc, int number) +{ + static fz_document *lastPageDoc = NULL; + static int lastPageNumber = -1; + if (lastPageNumber != number || lastPageDoc != doc) + { + if (lastPage) + fz_drop_page(ctx, lastPage); + lastPage = fz_load_page(ctx, doc, number-1); + lastPageDoc = doc; + lastPageNumber = number; + } +} + +EMSCRIPTEN_KEEPALIVE +char *drawPageAsHTML(fz_document *doc, int number) +{ + static unsigned char *data = NULL; + fz_stext_page *text; + fz_buffer *buf; + fz_output *out; + + fz_free(ctx, data); + data = NULL; + + loadPage(doc, number); + + buf = fz_new_buffer(ctx, 0); + { + out = fz_new_output_with_buffer(ctx, buf); + { + text = fz_new_stext_page_from_page(ctx, lastPage, NULL); + fz_print_stext_page_as_html(ctx, out, text); + fz_drop_stext_page(ctx, text); + } + fz_write_byte(ctx, out, 0); + fz_close_output(ctx, out); + fz_drop_output(ctx, out); + } + fz_buffer_extract(ctx, buf, &data); + fz_drop_buffer(ctx, buf); + + return (char*)data; +} + +EMSCRIPTEN_KEEPALIVE +char *drawPageAsSVG(fz_document *doc, int number) +{ + static int id = 0; + static unsigned char *data = NULL; + fz_buffer *buf; + fz_output *out; + fz_device *dev; + fz_rect bbox; + + fz_free(ctx, data); + data = NULL; + + loadPage(doc, number); + + buf = fz_new_buffer(ctx, 0); + { + out = fz_new_output_with_buffer(ctx, buf); + { + bbox = fz_bound_page(ctx, lastPage); + dev = fz_new_svg_device(ctx, out, bbox.x1-bbox.x0, bbox.y1-bbox.y0, FZ_SVG_TEXT_AS_PATH, 0, &id); + fz_run_page(ctx, lastPage, dev, fz_identity, NULL); + fz_close_device(ctx, dev); + fz_drop_device(ctx, dev); + } + fz_write_byte(ctx, out, 0); + fz_close_output(ctx, out); + fz_drop_output(ctx, out); + } + fz_buffer_extract(ctx, buf, &data); + fz_drop_buffer(ctx, buf); + + return (char*)data; +} + +EMSCRIPTEN_KEEPALIVE +char *drawPageAsPNG(fz_document *doc, int number, float dpi) +{ + static unsigned char *data = NULL; + float zoom = dpi / 72; + fz_pixmap *pix; + fz_buffer *buf; + fz_output *out; + + fz_free(ctx, data); + data = NULL; + + loadPage(doc, number); + + buf = fz_new_buffer(ctx, 0); + { + out = fz_new_output_with_buffer(ctx, buf); + { + pix = fz_new_pixmap_from_page(ctx, lastPage, fz_scale(zoom, zoom), fz_device_rgb(ctx), 0); + fz_write_pixmap_as_data_uri(ctx, out, pix); + fz_drop_pixmap(ctx, pix); + } + fz_write_byte(ctx, out, 0); + fz_close_output(ctx, out); + fz_drop_output(ctx, out); + } + fz_buffer_extract(ctx, buf, &data); + fz_drop_buffer(ctx, buf); + + return (char*)data; +} + +static fz_irect pageBounds(fz_document *doc, int number, float dpi) +{ + loadPage(doc, number); + return fz_round_rect(fz_transform_rect(fz_bound_page(ctx, lastPage), fz_scale(dpi/72, dpi/72))); +} + +EMSCRIPTEN_KEEPALIVE +int pageWidth(fz_document *doc, int number, float dpi) +{ + fz_irect bbox = pageBounds(doc, number, dpi); + return bbox.x1 - bbox.x0; +} + +EMSCRIPTEN_KEEPALIVE +int pageHeight(fz_document *doc, int number, float dpi) +{ + fz_irect bbox = pageBounds(doc, number, dpi); + return bbox.y1 - bbox.y0; +} + +EMSCRIPTEN_KEEPALIVE +char *pageLinks(fz_document *doc, int number, float dpi) +{ + static unsigned char *data = NULL; + fz_buffer *buf; + fz_link *links, *link; + + fz_free(ctx, data); + data = NULL; + + loadPage(doc, number); + + buf = fz_new_buffer(ctx, 0); + { + links = fz_load_links(ctx, lastPage); + { + for (link = links; link; link = link->next) + { + fz_irect bbox = fz_round_rect(fz_transform_rect(link->rect, fz_scale(dpi/72, dpi/72))); + fz_append_printf(ctx, buf, "<area shape=\"rect\" coords=\"%d,%d,%d,%d\"", + bbox.x0, bbox.y0, bbox.x1, bbox.y1); + if (fz_is_external_link(ctx, link->uri)) + fz_append_printf(ctx, buf, " href=\"%s\">\n", link->uri); + else + { + int linkNumber = fz_resolve_link(ctx, doc, link->uri, NULL, NULL); + fz_append_printf(ctx, buf, " href=\"#page%d\">\n", linkNumber+1); + } + } + } + fz_append_byte(ctx, buf, 0); + fz_drop_link(ctx, links); + } + fz_buffer_extract(ctx, buf, &data); + fz_drop_buffer(ctx, buf); + + return (char*)data; +} + +EMSCRIPTEN_KEEPALIVE +char *documentTitle(fz_document *doc) +{ + static char buf[100]; + if (fz_lookup_metadata(ctx, doc, FZ_META_INFO_TITLE, buf, sizeof buf) > 0) + return buf; + return "Untitled"; +} + +EMSCRIPTEN_KEEPALIVE +fz_outline *loadOutline(fz_document *doc) +{ + return fz_load_outline(ctx, doc); +} + +EMSCRIPTEN_KEEPALIVE +void freeOutline(fz_outline *outline) +{ + fz_drop_outline(ctx, outline); +} + +EMSCRIPTEN_KEEPALIVE +char *outlineTitle(fz_outline *node) +{ + return node->title; +} + +EMSCRIPTEN_KEEPALIVE +int outlinePage(fz_outline *node) +{ + return node->page + 1; +} + +EMSCRIPTEN_KEEPALIVE +fz_outline *outlineDown(fz_outline *node) +{ + return node->down; +} + +EMSCRIPTEN_KEEPALIVE +fz_outline *outlineNext(fz_outline *node) +{ + return node->next; +} |