[librsvg: 3/6] Fold cairo-clip.c into cairo-draw.c

[Federico Mena Quintero <federico src gnome org>]

commit 2a5d538ec85f5d93204fdfe6da4762f317b5e006
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Apr 28 13:14:28 2018 +0200

    Fold cairo-clip.c into cairo-draw.c
    
    No reason to keep this in a separate file

 Makefile.am               |   2 -
 librsvg/rsvg-cairo-clip.c | 109 ----------------------------------------------
 librsvg/rsvg-cairo-clip.h |  42 ------------------
 librsvg/rsvg-cairo-draw.c |  71 +++++++++++++++++++++++++++++-
 4 files changed, 70 insertions(+), 154 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index f317dd44..fc92b92e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -47,8 +47,6 @@ librsvg_@RSVG_API_MAJOR_VERSION@_la_SOURCES = \
        librsvg/rsvg-attributes.h               \
        librsvg/rsvg-base-file-util.c           \
        librsvg/rsvg-base.c                     \
-       librsvg/rsvg-cairo-clip.c               \
-       librsvg/rsvg-cairo-clip.h               \
        librsvg/rsvg-cairo-draw.c               \
        librsvg/rsvg-cairo-draw.h               \
        librsvg/rsvg-cairo-render.c             \
diff --git a/librsvg/rsvg-cairo-draw.c b/librsvg/rsvg-cairo-draw.c
index 03be5c7a..b0d512a9 100644
--- a/librsvg/rsvg-cairo-draw.c
+++ b/librsvg/rsvg-cairo-draw.c
@@ -31,9 +31,9 @@
 
 #include "rsvg-cairo-draw.h"
 #include "rsvg-cairo-render.h"
-#include "rsvg-cairo-clip.h"
 #include "rsvg-styles.h"
 #include "rsvg-filter.h"
+#include "rsvg-mask.h"
 #include "rsvg-structure.h"
 
 #include <math.h>
@@ -320,6 +320,75 @@ rsvg_cairo_generate_mask (cairo_t * cr, RsvgNode *mask, RsvgDrawingCtx *ctx, Rsv
     cairo_surface_destroy (surface);
 }
 
+static void
+rsvg_cairo_clip (RsvgDrawingCtx *ctx, RsvgNode *node_clip_path, RsvgBbox *bbox)
+{
+    RsvgCairoRender *save = RSVG_CAIRO_RENDER (ctx->render);
+    cairo_matrix_t affinesave;
+    RsvgState *clip_path_state;
+    cairo_t *cr;
+    RsvgCoordUnits clip_units;
+    GList *orig_cr_stack;
+    GList *orig_bb_stack;
+    GList *orig_ink_bb_stack;
+    GList *orig_surfaces_stack;
+    RsvgBbox orig_bbox;
+    RsvgBbox orig_ink_bbox;
+
+    g_assert (rsvg_node_get_type (node_clip_path) == RSVG_NODE_TYPE_CLIP_PATH);
+    clip_units = rsvg_node_clip_path_get_units (node_clip_path);
+
+    cr = save->cr;
+
+    clip_path_state = rsvg_node_get_state (node_clip_path);
+
+    /* Horribly dirty hack to have the bbox premultiplied to everything */
+    if (clip_units == objectBoundingBox) {
+        cairo_matrix_t bbtransform;
+        cairo_matrix_init (&bbtransform,
+                           bbox->rect.width,
+                           0,
+                           0,
+                           bbox->rect.height,
+                           bbox->rect.x,
+                           bbox->rect.y);
+        affinesave = rsvg_state_get_affine (clip_path_state);
+        cairo_matrix_multiply (&bbtransform, &bbtransform, &affinesave);
+        rsvg_state_set_affine (clip_path_state, bbtransform);
+    }
+
+    orig_cr_stack = save->cr_stack;
+    orig_bb_stack = save->bb_stack;
+    orig_ink_bb_stack = save->ink_bb_stack;
+    orig_surfaces_stack = save->surfaces_stack;
+
+    orig_bbox = save->bbox;
+    orig_ink_bbox = save->ink_bbox;
+
+    rsvg_drawing_ctx_state_push (ctx);
+    rsvg_node_draw_children (node_clip_path, ctx, 0, TRUE);
+    rsvg_drawing_ctx_state_pop (ctx);
+
+    if (clip_units == objectBoundingBox) {
+        rsvg_state_set_affine (clip_path_state, affinesave);
+    }
+
+    g_assert (save->cr_stack == orig_cr_stack);
+    g_assert (save->bb_stack == orig_bb_stack);
+    g_assert (save->ink_bb_stack == orig_ink_bb_stack);
+    g_assert (save->surfaces_stack == orig_surfaces_stack);
+
+    /* FIXME: this is an EPIC HACK to keep the clipping context from
+     * accumulating bounding boxes.  We'll remove this later, when we
+     * are able to extract bounding boxes from outside the
+     * general drawing loop.
+     */
+    save->bbox = orig_bbox;
+    save->ink_bbox = orig_ink_bbox;
+
+    cairo_clip (cr);
+}
+
 static void
 rsvg_cairo_push_render_stack (RsvgDrawingCtx * ctx)
 {