Attachment 51332 Details for Bug 41005 – fix setSoftMask

[patch] fix setSoftMask

0001-cairo-fix-setSoftMask-to-work-with-rotated-or-transl.patch (text/plain), 3.87 KB, created by Adrian Johnson on 2011-09-19 04:58:52 UTC

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Creator: Adrian Johnson

Created: 2011-09-19 04:58:52 UTC

Size: 3.87 KB

patch

obsolete

>From efd1df2bbd79b64c89b0bb7a91bd0334e97aee6d Mon Sep 17 00:00:00 2001
>From: Adrian Johnson <ajohnson@redneon.com>
>Date: Mon, 19 Sep 2011 21:11:44 +0930
>Subject: [PATCH] cairo: fix setSoftMask to work with rotated or translated ctm
>
>- Getting the clip extents in device space requires transforming all
>  four corners of the clip extents other wise the device extents will
>  not be correct for rotated ctm.
>
>- Adjust matrix to include translation of the clip extents origin
>  since the mask surface does not start at (0,0).
>---
> poppler/CairoOutputDev.cc |   44 +++++++++++++++++++++++++++-----------------
> 1 files changed, 27 insertions(+), 17 deletions(-)
>
>diff --git a/poppler/CairoOutputDev.cc b/poppler/CairoOutputDev.cc
>index 30c69f1..e320cf6 100644
>--- a/poppler/CairoOutputDev.cc
>+++ b/poppler/CairoOutputDev.cc
>@@ -78,6 +78,11 @@ static inline void printMatrix(cairo_matrix_t *matrix){
> 			matrix->x0, matrix->y0);
> }
> 
>+
>+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
>+#define MAX(a,b) (((a) > (b)) ? (a) : (b))
>+
>+
> //------------------------------------------------------------------------
> // CairoImage
> //------------------------------------------------------------------------
>@@ -410,8 +415,6 @@ void CairoOutputDev::updateMiterLimit(GfxState *state) {
>     cairo_set_miter_limit (cairo_shape, state->getMiterLimit());
> }
> 
>-#define MIN(a,b) (((a) < (b)) ? (a) : (b))
>-
> void CairoOutputDev::updateLineWidth(GfxState *state) {
>   LOG(printf ("line width: %f\n", state->getLineWidth()));
>   adjusted_stroke_width = gFalse;
>@@ -1509,24 +1512,25 @@ void CairoOutputDev::setSoftMask(GfxState * state, double * bbox, GBool alpha,
>      * So we paint the group to an image surface convert it to a luminocity map
>      * and then use that as the mask. */
> 
>-    double x1, y1, x2, y2, tmp;
>+    /* Get clip extents in device space */
>+    double x1, y1, x2, y2, x_min, y_min, x_max, y_max;
>     cairo_clip_extents(cairo, &x1, &y1, &x2, &y2);
>     cairo_user_to_device(cairo, &x1, &y1);
>     cairo_user_to_device(cairo, &x2, &y2);
>-    if (x1 > x2) {
>-      tmp = x1;
>-      x1 = x2;
>-      x2 = tmp;
>-    }
>-
>-    if (y1 > y2) {
>-      tmp = y1;
>-      y1 = y2;
>-      y2 = tmp;
>-    }
>+    x_min = MIN(x1, x2);
>+    y_min = MIN(y1, y2);
>+    x_max = MAX(x1, x2);
>+    y_max = MAX(y1, y2);
>+    cairo_clip_extents(cairo, &x1, &y1, &x2, &y2);
>+    cairo_user_to_device(cairo, &x1, &y2);
>+    cairo_user_to_device(cairo, &x2, &y1);
>+    x_min = MIN(x_min,MIN(x1, x2));
>+    y_min = MIN(y_min,MIN(y1, y2));
>+    x_max = MAX(x_max,MAX(x1, x2));
>+    y_max = MAX(y_max,MAX(y1, y2));
> 
>-    int width = (int)(ceil(x2) - floor(x1));
>-    int height = (int)(ceil(y2) - floor(y1));
>+    int width = (int)(ceil(x_max) - floor(x_min));
>+    int height = (int)(ceil(y_max) - floor(y_min));
> 
>     cairo_surface_t *source = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
>     cairo_t *maskCtx = cairo_create(source);
>@@ -1541,8 +1545,12 @@ void CairoOutputDev::setSoftMask(GfxState * state, double * bbox, GBool alpha,
> 			 colToDbl(backdropColorRGB.b));
>     cairo_paint(maskCtx);
> 
>-    cairo_matrix_t mat;
>+    /* Copy source ctm to mask ctm and translate origin so that the
>+     * mask appears it the same location on the source surface.  */
>+    cairo_matrix_t mat, tmat;
>+    cairo_matrix_init_translate(&tmat, -x_min, -y_min);
>     cairo_get_matrix(cairo, &mat);
>+    cairo_matrix_multiply(&mat, &mat, &tmat);
>     cairo_set_matrix(maskCtx, &mat);
> 
>     /* make the device offset of the new mask match that of the group */
>@@ -1594,6 +1602,8 @@ void CairoOutputDev::setSoftMask(GfxState * state, double * bbox, GBool alpha,
>     } else {
>       cairo_matrix_t patMatrix;
>       cairo_pattern_get_matrix(group, &patMatrix);
>+      /* Apply x_min, y_min offset to it appears in the same location as source. */
>+      cairo_matrix_multiply(&patMatrix, &patMatrix, &tmat);
>       cairo_pattern_set_matrix(mask, &patMatrix);
>     }
> 
>-- 
>1.7.4.1
>

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