Attachment 107478 Details for Bug 78042 – cairo: don't render text when matrix is not invertable

[patch] cairo: don't render text when matrix is not invertable

0001-cairo-don-t-render-text-when-text-matrix-is-not-inve.patch (text/plain), 2.50 KB, created by Adrian Johnson on 2014-10-07 11:03:20 UTC

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Creator: Adrian Johnson

Created: 2014-10-07 11:03:20 UTC

Size: 2.50 KB

patch

obsolete

>From dc61c32843f47ce7f13dbfcaa5163d53d6541686 Mon Sep 17 00:00:00 2001
>From: Adrian Johnson <ajohnson@redneon.com>
>Date: Thu, 26 Jan 2012 00:37:17 +1030
>Subject: [PATCH] cairo: don't render text when text matrix is not invertable
>
>Emulates acroread behavior.
>
>Bug 78042
>---
> poppler/CairoOutputDev.cc | 14 +++++++++-----
> poppler/CairoOutputDev.h  |  1 +
> 2 files changed, 10 insertions(+), 5 deletions(-)
>
>diff --git a/poppler/CairoOutputDev.cc b/poppler/CairoOutputDev.cc
>index 1c67b5c..e4ae9d7 100644
>--- a/poppler/CairoOutputDev.cc
>+++ b/poppler/CairoOutputDev.cc
>@@ -147,6 +147,7 @@ CairoOutputDev::CairoOutputDev() {
>   inUncoloredPattern = gFalse;
>   inType3Char = gFalse;
>   t3_glyph_has_bbox = gFalse;
>+  text_matrix_valid = gTrue;
> 
>   groupColorSpaceStack = NULL;
>   maskStack = NULL;
>@@ -283,6 +284,8 @@ void CairoOutputDev::restoreState(GfxState *state) {
>   if (cairo_shape)
>       cairo_restore (cairo_shape);
> 
>+  text_matrix_valid = gTrue;
>+
>   /* These aren't restored by cairo_restore() since we keep them in
>    * the output device. */
>   updateFillColor(state);
>@@ -657,11 +660,13 @@ void CairoOutputDev::updateFont(GfxState *state) {
>   */
>   invert_matrix = matrix;
>   if (cairo_matrix_invert(&invert_matrix)) {
>-    error(errSyntaxWarning, -1, "font matrix not invertible\n");
>+    error(errSyntaxWarning, -1, "font matrix not invertible");
>+    text_matrix_valid = gFalse;
>     return;
>   }
> 
>   cairo_set_font_matrix (cairo, &matrix);
>+  text_matrix_valid = gTrue;
> }
> 
> /* Tolerance in pixels for checking if strokes are horizontal or vertical
>@@ -1250,10 +1255,8 @@ void CairoOutputDev::endString(GfxState *state)
>   // ignore empty strings and invisible text -- this is used by
>   // Acrobat Capture
>   render = state->getRender();
>-  if (render == 3 || glyphCount == 0) {
>-    gfree(glyphs);
>-    glyphs = NULL;
>-    return;
>+  if (render == 3 || glyphCount == 0 || !text_matrix_valid) {
>+    goto finish;
>   }
> 
>   if (!(render & 1)) {
>@@ -1305,6 +1308,7 @@ void CairoOutputDev::endString(GfxState *state)
>     }
>   }
> 
>+finish:
>   gfree (glyphs);
>   glyphs = NULL;
>   if (use_show_text_glyphs) {
>diff --git a/poppler/CairoOutputDev.h b/poppler/CairoOutputDev.h
>index 28f97fd..26e6c44 100644
>--- a/poppler/CairoOutputDev.h
>+++ b/poppler/CairoOutputDev.h
>@@ -315,6 +315,7 @@ protected:
>   GBool needFontUpdate;                // set when the font needs to be updated
>   GBool printing;
>   GBool use_show_text_glyphs;
>+  GBool text_matrix_valid;
>   cairo_surface_t *surface;
>   cairo_glyph_t *glyphs;
>   int glyphCount;
>-- 
>2.1.1
>

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Attachments on bug 78042: 98133 | 107478

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