From: Matthias Kramm <kramm@quiss.org>
Date: Fri, 5 Feb 2010 06:22:08 +0000 (-0800)
Subject: added some basic transparency support to pdf2pdf
X-Git-Tag: version-0-9-1~160
X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=commitdiff_plain;h=90aec6a9d4522c29c75bc85d5b4fd58e544fc3a3

added some basic transparency support to pdf2pdf
---

diff --git a/lib/devices/pdf.c b/lib/devices/pdf.c
index aebc1bf..5346891 100644
--- a/lib/devices/pdf.c
+++ b/lib/devices/pdf.c
@@ -31,13 +31,25 @@
 #include "../jpeg.h"
 #include "../types.h"
 #include "../mem.h"
+#include "../log.h"
 #include "../gfxdevice.h"
 #include "../gfxtools.h"
 #include "../gfximage.h"
 
 typedef struct _internal {
     PDF* p;
+    
+    const char*config_pdfx;
+    char config_addblankpages;
+    double config_xpad;
+    double config_ypad;
+    int config_maxdpi;
+
+    int width,height;
+    int num_pages;
+
     char*tempfile;
+    char*page_opts;
     double lastx,lasty;
     gfxfontlist_t*fontlist;
 } internal_t;
@@ -134,6 +146,12 @@ void pdf_fill(gfxdevice_t*dev, gfxline_t*line, gfxcolor_t*color)
 {
     internal_t*i = (internal_t*)dev->internal;
     PDF_setrgbcolor_fill(i->p, color->r/255.0, color->g/255.0, color->b/255.0);
+    if(color->a!=255) {
+	char opacityfill[80];
+	sprintf(opacityfill, "opacityfill %f", color->a/256.0);
+	int gstate = PDF_create_gstate(i->p, opacityfill);
+	PDF_set_gstate(i->p, gstate);
+    }
 	
     if(mkline(line, i->p, 1)) {
 	PDF_fill(i->p);
@@ -144,20 +162,81 @@ void pdf_fillbitmap(gfxdevice_t*dev, gfxline_t*line, gfximage_t*img, gfxmatrix_t
 {
     internal_t*i = (internal_t*)dev->internal;
 
-    double l1 = sqrt(matrix->m00*matrix->m00+matrix->m01*matrix->m01)*img->width;
-    double l2 = sqrt(matrix->m10*matrix->m10+matrix->m11*matrix->m11)*img->height;
+    int t,size=img->width*img->height;
+    int has_alpha=0;
+    for(t=0;t<size;t++) {
+	if(img->data[t].a!=255) {
+	    has_alpha=1;
+	    break;
+	}
+    }
+
+    double w = sqrt(matrix->m00*matrix->m00+matrix->m01*matrix->m01);
+    double h = sqrt(matrix->m10*matrix->m10+matrix->m11*matrix->m11);
+    double l1 = w*img->width;
+    double l2 = h*img->height;
     double r = atan2(matrix->m01, matrix->m00);
 
     /* fit_image needs the lower left corner of the image */
     double x = matrix->tx + matrix->m10*img->height;
     double y = matrix->ty + matrix->m11*img->height;
 
-    char*tempfile = mktempname(0);
+    double dpi_x = 72.0 / w;
+    double dpi_y = 72.0 / h;
+    double dpi = dpi_x>dpi_y?dpi_x:dpi_y;
+    gfximage_t*rescaled_image = 0;
+    if(i->config_maxdpi && dpi > i->config_maxdpi) {
+	int newwidth = img->width*i->config_maxdpi/dpi;
+	int newheight = img->height*i->config_maxdpi/dpi;
+	rescaled_image = gfximage_rescale(img, newwidth, newheight);
+	msg("<notice> Downscaling %dx%d image (dpi %f, %.0fx%.0f on page) to %dx%d (dpi %d)", 
+		img->width, img->height, dpi, l1, l2, newwidth, newheight, i->config_maxdpi);
+	img = rescaled_image;
+    }
+
+    char tempfile[128];
+    mktempname(tempfile);
+
+    gfximage_save_jpeg(img, tempfile, 96);
+
+    int imgid=-1;
+    if(has_alpha) {
+	char tempfile2[128];
+	mktempname(tempfile2);
+	int t;
+	int size = img->width*img->height;
+	unsigned char*alpha = malloc(size);
+	for(t=0;t<size;t++) {
+	    alpha[t] = img->data[t].a;
+	}
+	jpeg_save_gray(alpha, img->width, img->height, 97, tempfile2);
+	free(alpha);
+	int maskid = PDF_load_image(i->p, "jpeg", tempfile2, 0, "mask");
+	unlink(tempfile2);
+	char masked[80];
+	if(maskid<0) {
+	    msg("<error> Couldn't process mask jpeg of size %dx%d: error code %d", img->width, img->height, maskid);
+	    return;
+	}
+	sprintf(masked, "masked %d", maskid);
+	imgid = PDF_load_image(i->p, "jpeg", tempfile, 0, masked);
+    } else {
+	imgid = PDF_load_image(i->p, "jpeg", tempfile, 0, "");
+    }
+
+    if(imgid<0) {
+	msg("<error> Couldn't process jpeg of size %dx%d: error code %d, file %s", img->width, img->height, imgid, tempfile);
+	return;
+    }
+    unlink(tempfile);
+    
     char options[80];
     sprintf(options, "boxsize {%f %f} fitmethod meet rotate %f", l1, l2, r*180/M_PI);
-    gfximage_save_jpeg(img, tempfile, 99);
-    int imgid = PDF_load_image(i->p, "jpeg", tempfile, 0, "");
     PDF_fit_image(i->p, imgid, x, y, options);
+    PDF_close_image(i->p, imgid);
+
+    if(rescaled_image)
+	gfximage_free(rescaled_image);
 }
 
 void pdf_fillgradient(gfxdevice_t*dev, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*matrix)
diff --git a/lib/jpeg.c b/lib/jpeg.c
index 71483f6..f9cdf41 100644
--- a/lib/jpeg.c
+++ b/lib/jpeg.c
@@ -124,6 +124,45 @@ int jpeg_save(unsigned char*data, int width, int height, int quality, const char
   return 1;
 }
 
+int jpeg_save_gray(unsigned char*data, int width, int height, int quality, const char*filename)
+{
+  struct jpeg_destination_mgr mgr;
+  struct jpeg_compress_struct cinfo;
+  struct jpeg_error_mgr jerr;
+
+  if(filename) fi = fopen(filename, "wb");
+  else         fi = 0;
+
+  memset(&cinfo, 0, sizeof(cinfo));
+  memset(&jerr, 0, sizeof(jerr));
+  memset(&mgr, 0, sizeof(mgr));
+  cinfo.err = jpeg_std_error(&jerr);
+  jpeg_create_compress(&cinfo);
+
+  mgr.init_destination = file_init_destination;
+  mgr.empty_output_buffer = file_empty_output_buffer;
+  mgr.term_destination = file_term_destination;
+  cinfo.dest = &mgr;
+  cinfo.image_width  = width;
+  cinfo.image_height = height;
+  cinfo.input_components = 1;
+  cinfo.in_color_space = JCS_GRAYSCALE;
+  jpeg_set_defaults(&cinfo);
+  jpeg_set_quality(&cinfo,quality,TRUE);
+  jpeg_start_compress(&cinfo, FALSE);
+  int t;
+  for(t=0;t<height;t++) {
+    unsigned char*data2 = &data[width*t];
+    jpeg_write_scanlines(&cinfo, &data2, 1);
+  }
+  jpeg_finish_compress(&cinfo);
+
+  if(fi) fclose(fi);
+  jpeg_destroy_compress(&cinfo);
+  return 1;
+}
+
+
 int jpeg_save_to_file(unsigned char*data, int width, int height, int quality, FILE*_fi)
 {
   struct jpeg_destination_mgr mgr;
diff --git a/lib/jpeg.h b/lib/jpeg.h
index 9af70f5..54b67d0 100644
--- a/lib/jpeg.h
+++ b/lib/jpeg.h
@@ -8,6 +8,7 @@ extern "C" {
 #endif
 
 int jpeg_save(unsigned char*data, int width, int height, int quality, const char*filename);
+int jpeg_save_gray(unsigned char*data, int width, int height, int quality, const char*filename);
 int jpeg_save_to_file(unsigned char*data, int width, int height, int quality, FILE*fi);
 int jpeg_save_to_mem(unsigned char*data, int width, int height, int quality, unsigned char*dest, int destsize);
 int jpeg_load(const char*filename, unsigned char**dest, int*width, int*height);