From 13278eaedfccf32ea897ef187d82d047af903557 Mon Sep 17 00:00:00 2001 From: Johannes Hofmann Date: Sat, 4 Feb 2006 15:35:41 +0100 Subject: initial version of load_page() --- src/GsWidget.H | 10 ++++ src/GsWidget.cxx | 144 ++++++++++++++++++++++++++++++++++++++++++-------- src/Makefile.am | 2 + src/PostscriptDSC.H | 45 ++++++++++++++++ src/PostscriptDSC.cxx | 142 +++++++++++++++++++++++++++++++++++++++++++++++++ src/flpsed.cxx | 2 + 6 files changed, 323 insertions(+), 22 deletions(-) create mode 100644 src/PostscriptDSC.H create mode 100644 src/PostscriptDSC.cxx diff --git a/src/GsWidget.H b/src/GsWidget.H index 99ef08a..0735607 100644 --- a/src/GsWidget.H +++ b/src/GsWidget.H @@ -34,8 +34,10 @@ #include #include +#include "PostscriptDSC.H" class GsWidget : public Fl_Widget { + PostscriptDSC *dsc; int gs_win; Atom atoms[5]; pid_t gs_pid; @@ -61,6 +63,8 @@ public: int load(int fd); + int load_page(int p); + int reload(); int next(); @@ -73,9 +77,15 @@ public: private: void setProps(); + + void exec_gs(); void kill_gs(); + int fd_copy(int to, int from, size_t len); + + int feed_page(int p); + bool gs_active(); }; #endif diff --git a/src/GsWidget.cxx b/src/GsWidget.cxx index dc134d2..14d77f9 100644 --- a/src/GsWidget.cxx +++ b/src/GsWidget.cxx @@ -33,7 +33,9 @@ #include #include "GsWidget.H" +#include "PostscriptDSC.H" +#define MIN(A,B) ((A)<(B)?(A):(B)) void GsWidget::draw() { if (!offscreen) { @@ -111,6 +113,7 @@ GsWidget::GsWidget(int X,int Y,int W, int H) : Fl_Widget(X, Y, W, H) { initial_height = H; in_fd = -1; reload_needed = 0; + dsc = new PostscriptDSC(); } GsWidget::~GsWidget() { @@ -130,12 +133,25 @@ int GsWidget::load(char *f) { } int GsWidget::load(int fd) { + pid_t pid; + if (in_fd >= 0 && fd != in_fd) { close (in_fd); } in_fd = fd; + if (dsc->parse(in_fd) == 0) { + int bb_x, bb_y, bb_w, bb_h; + + dsc->print(); + dsc->get_bounding_box(&bb_x, &bb_y, &bb_w, &bb_h); + paper_x = bb_w; + paper_y = bb_h; + } + + lseek(in_fd, 0L, SEEK_SET); + fl_cursor(FL_CURSOR_WAIT); kill_gs(); @@ -146,30 +162,10 @@ int GsWidget::load(int fd) { setProps(); - pid_t pid = fork(); + pid = fork(); if (pid == (pid_t) 0) { - char *argv[16]; - char gvenv[256]; - int d_null = open("/dev/null", O_WRONLY); - - dup2(d_null, STDOUT_FILENO); - close(d_null); dup2(in_fd, STDIN_FILENO); - snprintf(gvenv, 256, "%d %d", (int) fl_xid(window()), (int) offscreen); - - setenv("GHOSTVIEW", gvenv, 1); - argv[0] = "gs"; - argv[1] = "-dSAFER"; - argv[2] = "-dQUIET"; - argv[3] = "-sDEVICE=x11alpha"; - argv[4] = "-dNOPLATFONTS"; - argv[5] = "-"; - argv[6] = NULL; - execvp(argv[0], argv); - perror("exec"); - fprintf(stderr, "Please install ghostscript and make sure 'gs' " - "is in the PATH.\n"); - exit(1); + exec_gs(); } else { gs_pid = pid; page = 0; @@ -178,6 +174,110 @@ int GsWidget::load(int fd) { return 0; } +int +GsWidget::load_page(int p) { + pid_t pid; + + if (p < 1 || p > dsc->get_pages()) { + fprintf(stderr, "Page %d not found in document\n", p); + return 1; + } + + fl_cursor(FL_CURSOR_WAIT); + kill_gs(); + + setProps(); + + pid = fork(); + + if (pid == (pid_t) 0) { + feed_page(p); + exit(0); + } else { + gs_pid = pid; + } +} + +int GsWidget::feed_page(int p) { + pid_t pid; + int pdes[2]; + + if (pipe(pdes) < 0) { + return 1; + } + + pid = fork(); + + if (pid == (pid_t) 0) { + close(pdes[1]); + dup2(pdes[0], STDIN_FILENO); + exec_gs(); + } else { + size_t len; + + close(pdes[0]); + + lseek(in_fd, 0L, SEEK_SET); + len = dsc->get_setup_len(); + if (fd_copy(pdes[1], in_fd, len) != 0) { + exit(1); + } + + lseek(in_fd, dsc->get_page_off(p), SEEK_SET); + len = dsc->get_page_len(p); + if (fd_copy(pdes[1], in_fd, len) != 0) { + exit(1); + } + + } + +} + +int GsWidget::fd_copy(int to, int from, size_t len) { + size_t n, r; + char buf[1024]; + + n = 0; + while(len > 0) { + r = read(from, buf, MIN(sizeof(buf), len)); + + write(STDOUT_FILENO, buf, r); + if (r < 0) { + perror("read"); + return 1; + } + write(to, buf, r); + len -= r; + } + + return 0; +} + +void GsWidget::exec_gs() { + char *argv[16]; + char gvenv[256]; + int d_null = open("/dev/null", O_WRONLY); + + dup2(d_null, STDOUT_FILENO); + close(d_null); + + snprintf(gvenv, 256, "%d %d", (int) fl_xid(window()), (int) offscreen); + + setenv("GHOSTVIEW", gvenv, 1); + argv[0] = "gs"; + argv[1] = "-dSAFER"; + argv[2] = "-dQUIET"; + argv[3] = "-sDEVICE=x11alpha"; + argv[4] = "-dNOPLATFONTS"; + argv[5] = "-"; + argv[6] = NULL; + execvp(argv[0], argv); + perror("exec"); + fprintf(stderr, "Please install ghostscript and make sure 'gs' " + "is in the PATH.\n"); + exit(1); +} + int GsWidget::reload() { int ret; diff --git a/src/Makefile.am b/src/Makefile.am index 62c767c..8a0e366 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -7,6 +7,7 @@ flpsed_SOURCES = \ PSEditText.cxx \ PSEditModel.cxx \ Postscript.cxx \ + PostscriptDSC.cxx \ flpsed.cxx \ util.c @@ -15,6 +16,7 @@ noinst_HEADERS = \ PSEditModel.H \ PSEditText.H \ Postscript.H \ + PostscriptDSC.H \ PSEditor.H \ PSEditWidget.H \ util.h diff --git a/src/PostscriptDSC.H b/src/PostscriptDSC.H new file mode 100644 index 0000000..6c5823f --- /dev/null +++ b/src/PostscriptDSC.H @@ -0,0 +1,45 @@ +// +// Copyright 2006 by Johannes Hofmann +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Library General Public +// License as published by the Free Software Foundation; either +// version 2 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Library General Public License for more details. +// +// You should have received a copy of the GNU Library General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 +// USA. +// + +#ifndef POSTSCRIPTDSC_H +#define POSTSCRIPTDSC_H + +class PostscriptDSC { + private: + int bb_x, bb_y, bb_w, bb_h; + size_t setup_len; + int pages; + + size_t *page_off; + size_t *page_len; + + public: + PostscriptDSC(); + ~PostscriptDSC(); + + int parse(int fd); + int get_pages(); + void get_bounding_box(int *x, int *y, int *w, int *h); + size_t get_setup_len(); + size_t get_page_off(int p); + size_t get_page_len(int p); + void print(); +}; + +#endif diff --git a/src/PostscriptDSC.cxx b/src/PostscriptDSC.cxx new file mode 100644 index 0000000..bd47837 --- /dev/null +++ b/src/PostscriptDSC.cxx @@ -0,0 +1,142 @@ +// +// Postscript Document Structure Convention handling routines. +// +// Copyright 2006 by Johannes Hofmann +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Library General Public +// License as published by the Free Software Foundation; either +// version 2 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Library General Public License for more details. +// +// You should have received a copy of the GNU Library General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 +// USA. +// + +#include +#include +#include +#include "PostscriptDSC.H" + +PostscriptDSC::PostscriptDSC() { + bb_x = 0; + bb_y = 0; + bb_w = 594; // A4 + bb_h = 841; // + setup_len = 0; + pages = 0; + page_off = NULL; + page_len = NULL; +} + +int +PostscriptDSC::parse(int fd) { + FILE *fp; + char linebuf[1024]; + int x, y, w, h; + int p1, p2, ps; + int i = 0; + + bb_x = 0; + bb_y = 0; + bb_w = 594; // A4 + bb_h = 841; // + setup_len = 0; + pages = 0; + page_off = NULL; + page_len = NULL; + + fp = fdopen(fd, "r"); + if (!fp) { + perror("fdopen"); + return 1; + } + + while (fgets(linebuf, sizeof(linebuf), fp) != NULL) { + if (sscanf(linebuf, "%%%%BoundingBox: %d %d %d %d", &x, &y, &w, &h) == 4) { + bb_x = x; + bb_y = y; + bb_w = w; + bb_h = h; + } else if (strncmp(linebuf, "%%EndSetup", strlen("%%EndSetup")) == 0) { + setup_len = ftello(fp); + } else if (sscanf(linebuf, "%%%%Pages: %d", &ps) == 1) { + if (pages != 0) { + fprintf(stderr, "Multiple Pages tags found\n"); + free(page_off); + free(page_len); + return 1; + } + + pages = ps; + page_off = (size_t*) malloc(sizeof(size_t) * (pages + 1)); + memset(page_off, 0, sizeof(size_t) * (pages + 1)); + page_len = (size_t*) malloc(sizeof(size_t) * (pages + 1)); + memset(page_len, 0, sizeof(size_t) * (pages + 1)); + } else if (sscanf(linebuf, "%%%%Page: %d %d", &p1, &p2) == 2) { + if (p2 > pages) { + fprintf(stderr, "Page %d > Pages (%d)\n", p1, pages); + return 1; + } + if (page_off[p1] != NULL) { + fprintf(stderr, "Page %d already defined\n", p1); + return 1; + } + if (p1 > 1 && page_off[p1 - 1] == NULL) { + fprintf(stderr, "Page %d not yet defined\n", p1 - 1); + return 1; + } + + page_off[p1] = ftello(fp); + if (p1 > 1) { + page_len[p1 - 1] = page_off[p1] - page_off[p1 - 1]; + } + } + } +} + +void +PostscriptDSC::get_bounding_box(int *x, int *y, int *w, int *h) { + *x = bb_x; + *y = bb_y; + *w = bb_w; + *h = bb_h; +} + +int +PostscriptDSC::get_pages() { + return pages; +} + +size_t +PostscriptDSC::get_setup_len() { + return setup_len; +} + +size_t +PostscriptDSC::get_page_off(int p) { + return page_off[p]; +} + +size_t +PostscriptDSC::get_page_len(int p) { + return page_len[p]; +} + +void +PostscriptDSC::print() { + int i; + + printf("x %d, y %d, w %d, h %d\n", bb_x, bb_y, bb_w, bb_h); + printf("setup_len %d\n", setup_len); + for (i=0; iload(file); + + psed_p->load_page(2); } } -- cgit v1.2.3