From 630c98052e15053e72884a5f5c45f84a496ec3ac Mon Sep 17 00:00:00 2001
From: = <=>
Date: Fri, 23 Sep 2011 14:37:44 -0700
Subject: [PATCH] Adds support for all the basic graphic state operators

---
 pdf.js                  |  74 ++++++++++++++++++++++++++--
 test/pdfs/extgstate.pdf | 105 ++++++++++++++++++++++++++++++++++++++++
 test/test_manifest.json |   6 +++
 3 files changed, 180 insertions(+), 5 deletions(-)
 create mode 100644 test/pdfs/extgstate.pdf

diff --git a/pdf.js b/pdf.js
index 1b80424d6..82a6a9bab 100644
--- a/pdf.js
+++ b/pdf.js
@@ -4791,7 +4791,65 @@ var CanvasGraphics = (function canvasGraphics() {
       TODO('set flatness: ' + flatness);
     },
     setGState: function canvasGraphicsSetGState(dictName) {
-      TODO('set graphics state from dict: ' + dictName);
+      var extGState = this.xref.fetchIfRef(this.res.get('ExtGState'));
+      if (IsDict(extGState) && extGState.has(dictName.name)) {
+        var gsState = this.xref.fetchIfRef(extGState.get(dictName.name));
+        var self = this;
+        gsState.forEach(function(key, value) {
+          switch (key) {
+            case 'Type':
+              break;
+            case 'LW':
+              self.setLineWidth(value);
+              break;
+            case 'LC':
+              self.setLineCap(value);
+              break;
+            case 'LJ':
+              self.setLineJoin(value);
+              break;
+            case 'ML':
+              self.setMiterLimit(value);
+              break;
+            case 'D':
+              self.setDash(value[0], value[1]);
+              break;
+            case 'RI':
+              self.setRenderingIntent(value);
+              break;
+            case 'FL':
+              self.setFlatness(value);
+              break;
+            case 'Font':
+              self.setFont(value[0], value[1]);
+              break;
+            case 'OP':
+            case 'op':
+            case 'OPM':
+            case 'BG':
+            case 'BG2':
+            case 'UCR':
+            case 'UCR2':
+            case 'TR':
+            case 'TR2':
+            case 'HT':
+            case 'SM':
+            case 'SA':
+            case 'BM':
+            case 'SMask':
+            case 'CA':
+            case 'ca':
+            case 'AIS':
+            case 'TK':
+              TODO('graphic state operator ' + key);
+              break;
+            default:
+              warn('Unknown graphic state operator ' + key);
+              break;
+          }
+        });
+      }
+
     },
     save: function canvasGraphicsSave() {
       this.ctx.save();
@@ -4958,11 +5016,17 @@ var CanvasGraphics = (function canvasGraphics() {
       this.current.leading = -leading;
     },
     setFont: function canvasGraphicsSetFont(fontRef, size) {
-      var font = this.xref.fetchIfRef(this.res.get('Font'));
-      if (!IsDict(font))
-        return;
+      var font;
+      // the tf command uses a name, but graphics state uses a reference
+      if (IsName(fontRef)) {
+        font = this.xref.fetchIfRef(this.res.get('Font'));
+        if (!IsDict(font))
+         return;
 
-      font = font.get(fontRef.name);
+        font = font.get(fontRef.name);
+      } else if (IsRef(fontRef)) {
+        font = fontRef;
+      }
       font = this.xref.fetchIfRef(font);
       if (!font)
         error('Referenced font is not found');
diff --git a/test/pdfs/extgstate.pdf b/test/pdfs/extgstate.pdf
new file mode 100644
index 000000000..711c45147
--- /dev/null
+++ b/test/pdfs/extgstate.pdf
@@ -0,0 +1,105 @@
+%PDF-1.4
+%öäüß
+1 0 obj
+<<
+/Type /Catalog
+/Version /1.4
+/Pages 2 0 R
+>>
+endobj
+2 0 obj
+<<
+/Type /Pages
+/Kids [3 0 R]
+/Count 1
+>>
+endobj
+3 0 obj
+<<
+/Type /Page
+/MediaBox [0 0 612 792]
+/Resources 4 0 R
+/Parent 2 0 R
+/Contents 5 0 R
+>>
+endobj
+4 0 obj
+<<
+/ExtGState 6 0 R
+/Font 7 0 R
+/XObject <<
+>>
+>>
+endobj
+5 0 obj
+<<
+/Length 8 0 R
+>>
+stream
+/GS1 gs
+/F0 12 Tf
+BT
+100 700 Td
+(I should be courier!) Tj
+ET
+50 600 m
+400 600 l
+S
+
+endstream
+endobj
+6 0 obj
+<<
+/GS1 9 0 R
+>>
+endobj
+7 0 obj
+<<
+/F0 10 0 R
+>>
+endobj
+8 0 obj
+82
+endobj
+9 0 obj
+<<
+/Type /ExtGState
+/LW 10
+/LC 1
+/LJ 2
+/ML 0.3000000119
+/D [[0.0917000026 183.3300018311]
+ 0]
+/Font [10 0 R 36]
+>>
+endobj
+10 0 obj
+<<
+/Type /Font
+/Subtype /Type1
+/BaseFont /Courier
+/Encoding /WinAnsiEncoding
+>>
+endobj
+xref
+0 11
+0000000000 65535 f
+0000000015 00000 n
+0000000078 00000 n
+0000000135 00000 n
+0000000239 00000 n
+0000000304 00000 n
+0000000441 00000 n
+0000000473 00000 n
+0000000505 00000 n
+0000000523 00000 n
+0000000653 00000 n
+trailer
+<<
+/Root 1 0 R
+/ID [<BFFF29B7D1C75EC69AC080682C2AFC5B> <BFFF29B7D1C75EC69AC080682C2AFC5B>]
+/Size 11
+>>
+startxref
+749
+%%EOF
diff --git a/test/test_manifest.json b/test/test_manifest.json
index edf13b7c5..5c1802deb 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -145,5 +145,11 @@
        "link": true,
        "rounds": 1,
        "type": "load"
+    },
+    {  "id": "extgstate",
+       "file": "pdfs/extgstate.pdf",
+       "link": false,
+       "rounds": 1,
+       "type": "load"
     }
 ]