[librsvg] (90 commits) ...Merge branch 'viewport-with-offsets'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  812b445... Add test for render_element_to_viewport() with a viewport n
  2f119bb... DrawingCtx: don't use the base offsets at all
  2bf5d08... NodeSvg: Use the initial viewport when rendering the toplev
  618f8de... rsvg-test: Try a 0 offset for the frame; this makes all tes
  52397dc... DrawingCtx.with_discrete_layer(): Add a few missing map_err
  28b5c86... DrawingCtx.get_offset() - removed, since it always returned
  16e81cb... DrawingCtx::new() - No need to calculate a specific affine 
  243e7d2... DrawingCtx::set_affine_on_cr() - Removed, since it wasn't c
  6c44feb... wip: test render_to_viewport_with_transform()
  5951d00... DrawingCtx: Centralize the place where a viewport-sized sur
  96c525e... DrawingCtx: extract function to get the clipping node
  3916d6f... DrawingCtx: extract function to do the actual clipping to t
  21810bd... DrawingCtx: clarify the mask vs. no-mask case a bit
  e640a60... DrawingCtx: Remove the original_cr confusion; it's always t
  c317759... Don't mutate the DrawingCtx's bbox in the clipping code
  425a521... Pass the current bbox as immutable to the masking code
  cf6dd43... Convince myself that the bbox in the FilterContext is alway
  d87504e... Pass the bbox of the node being filtered to the filters; do
  f6a536a... Pass the current node_bbox to the filters from the toplevel
  ef82e13... Replace the explicit bbox_stack by an implicit one
  02a8dac... Split with_discrete_layer() into two cases
  9d14cd1... Don't get the temporary surface in a roundabout way
  305d2d8... DrawingCtx::is_cairo_context_nested(): Removed; now the off
  da3fb67... DrawingCtx.initial_cr: removed field, it is no longer used
  821e801... DrawingCtx.initial_affine - store the initial affine of the
  8dce1ac... with_discrete_layer(): Restore the state completely if a fi
  d49e82e... clip_path.rs: Remove superfluous rebinding of the cr
  bdcd78d... NodeClipPath.to_cairo_context() - reorder code a bit
  08f9bb3... NodeClipPath.to_cairo_context() - Simplify the way in which
  2bef6ae... DrawingCtx.with_saved_matrix() - new function
  5ae6773... clip_path.rs: use DrawingCtx.with_saved_matrix()
  e870e9f... node.rs: use DrawingCtx.with_saved_matrix()
  1bddf63... DrawingCtx.with_saved_cr() - new function
  5234199... image.rs: use DrawingCtx.with_saved_cr()
  18c9a91... text.rs: use DrawingCtx.with_saved_cr()
  eadebf4... marker.rs: use DrawingCtx.with_saved_cr()
  188761f... with_discrete_layer(): use DrawingCtx.with_saved_cr()
  b38b9eb... with_discrete_layer(): avoid a temporary result
  3ae3bb1... PathBuilder::to_cairo() - Check the cr.status after complet
  325b736... (#438): Only create a temporary ImageSurface if we'll need 
  677eed4... Oops, we just need the cairo::prelude for SurfaceExt
  c469441... NodeClipPath.to_cairo_context(): Don't take an affine; use 
  19fb7e8... DrawingCtx::mask_surface(): inline into its only caller
  e164765... NodeClipPath::to_cairo_context(): Move the short-circuit if
  14b8d03... Rename variable
  2f67f2d... NodeMask::generate_cairo_mask(): Move the short-circuit if 
  a061a7d... Clarify just when we are measuring the toplevel SVG
  444a435... Use a single conditional to figure out the SVG's viewport/v
  9191af6... Rename variable
  65484a7... compute_luminance_to_alpha(): Take a SharedImageSurface, no
  a6d6f38... (#445): Initialize libxml2 so multithreaded tests don't dea
  6bbfe94... Reset back to the initial_affine before clipping
  229f320... Reset back to the initial_affine before masking
  0d2785b... start breakage: restore the offset in rsvg-test
  168ab90... When using a temporary surface, un-transform by the initial
  f133df9... clip_to_node() - don't consume the node reference
  ff217e7... New test for clipping to a viewport offsetted by a transfor
  8dc1cd1... New test for masking to a viewport offsetted by a transform
  dff605d... Only use an untransformed affine if the cr_stack is empty
  3aee493... tests/render_to_viewport.rs: Extract function to do the ren
  896ce3f... tests/render_to_viewport.rs: Extract function to compare th
  1bc5d34... Make a librsvg_crate/tests/utils module
  fec1130... Rename test_file to compare_to_file
  54fc926... librsvg_crate/tests/primitives.rs - New tests for drawing p
  21062b3... Offset the initial_affine by the original viewport
  0f8a7f7... opacity_inside_transformed_group(): New test for what cause
  7b07dd5... Nested temporary surfaces should not be offset with respect
  78d4865... Print where the test suite is outputting test artifacts
  be32065... Extract function to copy a surface to a SharedImageSurface
  be7a9ea... Initialize the DrawingCtx's bbox with the initial affine, f
  d2e4faf... Don't rebind "affine", since we need the original value
  a44837e... Compute all of the affines in the same place
  464da35... Rename variable
  f8d93ef... Compute the initial_inverse only once
  20815c7... Extract computation of affines to a separate function
  7e7dfb0... Rename CompositingAffines.temporary to .for_temporary_surfa
  39b5cba... Pass the whole CompositingAffines to the masking code
  1ac98bf... Pass the intial offsetted affine as part of CompositingAffi
  5a250ae... Oops, use the compositing affine when setting the mask
  e8f9791... Move the decision about the topmost temporary surface to Co
  736a22a... Rename "node" to "mask_node" when appropriate
  2d8eb09... CompositingAffines.outside_temporary_surface - renamed from
  ac644f9... Obviate the need for reusing a previous result
  465c207... Push/pop the cairo_t while drawing a mask's contents
  c509eb4... Fix the affines used in get_snapshot()
  9d9a17c... Extract function to compute the size of the temporary surfa
  324687a... (#295): Ensure the initial viewport fits into temporary sur
  b8937c3... Handle.render_cairo_sub() - implement in terms of render_el
  906d495... librsvg_crate/tests: Broken try at explicitly loading fixtu
  69873e0... Merge branch 'viewport-with-offsets'