DenysMedvid/pdf2htmlEX
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Code

Fix covered text processing issue (in DrawingTracer::set_ctm) when zoom != 1

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This commit is contained in:
Duan Yao 2014-06-17 23:37:25 +08:00
parent 4ab00e3644
commit e468f03494
3 changed files with 24 additions and 13 deletions
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32
src/DrawingTracer.cc
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@ -41,19 +41,21 @@ void DrawingTracer::finish()
}
}
void DrawingTracer::set_ctm(GfxState *state)
// Poppler won't inform us its initial CTM, and the initial CTM is affected by zoom level.
// OutputDev::clip() may be called before OutputDev::updateCTM(), so we can't rely on GfxState::getCTM(),
// and should trace ctm changes ourself (via cairo).
void DrawingTracer::update_ctm(GfxState *state, double m11, double m12, double m21, double m22, double m31, double m32)
{
if (!param.process_covered_text)
return;
double * ctm = state->getCTM();
cairo_matrix_t matrix;
matrix.xx = ctm[0];
matrix.yx = ctm[1];
matrix.xy = ctm[2];
matrix.yy = ctm[3];
matrix.x0 = ctm[4];
matrix.y0 = ctm[5];
cairo_set_matrix(cairo, &matrix);
matrix.xx = m11;
matrix.yx = m12;
matrix.xy = m21;
matrix.yy = m22;
matrix.x0 = m31;
matrix.y0 = m32;
cairo_transform(cairo, &matrix);
}
void DrawingTracer::clip(GfxState * state, bool even_odd)
@ -154,7 +156,7 @@ void DrawingTracer::draw_non_char_bbox(GfxState * state, double * bbox)
cairo_clip_extents(cairo, cbox, cbox + 1, cbox + 2, cbox + 3);
if(bbox_intersect(cbox, bbox, bbox))
{
tm_transform_bbox(state->getCTM(), bbox);
transform_bbox_by_ctm(bbox);
if (on_non_char_drawn)
on_non_char_drawn(bbox);
}
@ -188,7 +190,7 @@ void DrawingTracer::draw_char_bbox(GfxState * state, double * bbox)
cairo_clip_extents(cairo, cbox, cbox + 1, cbox + 2, cbox + 3);
bbox_intersect(cbox, bbox, bbox);
}
tm_transform_bbox(state->getCTM(), bbox);
transform_bbox_by_ctm(bbox);
if (pt_in < 4)
{
if(on_char_clipped)
@ -247,4 +249,12 @@ void DrawingTracer::draw_char(GfxState *state, double x, double y, double ax, do
draw_char_bbox(state, bbox);
}
void DrawingTracer::transform_bbox_by_ctm(double * bbox)
{
cairo_matrix_t mat;
cairo_get_matrix(cairo, &mat);
double mat_a[6] {mat.xx, mat.yx, mat.xy, mat.yy, mat.x0, mat.y0};
tm_transform_bbox(mat_a, bbox);
}
} /* namespace pdf2htmlEX */

3
src/DrawingTracer.h
View File

@ -46,7 +46,7 @@ public:
* An image is drawing
*/
void draw_image(GfxState * state);
void set_ctm(GfxState * state);
void update_ctm(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32);
void clip(GfxState * state, bool even_odd = false);
void clip_to_stroke_path(GfxState * state);
void fill(GfxState * state, bool even_odd = false);
@ -60,6 +60,7 @@ private:
void do_path(GfxState * state, GfxPath * path);
void draw_non_char_bbox(GfxState * state, double * bbox);
void draw_char_bbox(GfxState * state, double * bbox);
void transform_bbox_by_ctm(double * bbox);
const Param & param;
cairo_t * cairo = nullptr;

2
src/HTMLRenderer/state.cc
View File

@ -46,7 +46,7 @@ void HTMLRenderer::updateFont(GfxState * state)
void HTMLRenderer::updateCTM(GfxState * state, double m11, double m12, double m21, double m22, double m31, double m32)
{
ctm_changed = true;
tracer.set_ctm(state);
tracer.update_ctm(state, m11, m12, m21, m22, m31, m32);
}
void HTMLRenderer::updateTextMat(GfxState * state)
{