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571a27b4fc
This adds a new GPU accelerated backend for Cairo based on the Cogl 3D graphics API. This backend aims to support Cairo in a way that translates as naturally as possible to using a GPU, it does not strive to compete with the anti-aliasing quality of the image backend if it can't be done efficiently using the GPU - raw performance isn't the only metric of concern, so is power usage. As an overview of how the backend works: - fills are handled by tessellating paths into triangles - the backend has an extra fill_rectangle drawing operation so we have a fast-path for drawing rectangles which are so common. - strokes are also tessellated into triangles. - stroke and fill tessellations are cached to avoid the cpu overhead of tessellation and cost of upload given that its common for apps to re-draw the same path multiple times. The tessellations can survive translations and rotations increasing the probability that they can be re-used. - sources and masks are handled using multi-texturing. - clipping is handled with a scissor and the stencil buffer which we're careful to only update when they really change. - linear gradients are rendered to a 1d texture using a triangle strip + interpolating color attributes. All cairo extend modes are handled by corresponding texture sampler wrap modes without needing programmable fragment processing. - antialiasing should be handled using Cogl's multisampling API XXX: This is a work in progress!! TODO: - handle at least basic radial gradients (No need to handle full pdf semantics, since css, svg and canvas only allow radial gradients defined as one circle + a point that must lie within the first circle.) - currently we fall back to pixman for radial gradients. - support glyph rendering with a decent glyph cache design. The current plan is a per scaled-font growable cache texture + a scratch cache for one-shot/short-lived glyphs. - decide how to handle npot textures when lacking hardware support. Current plan is to add a transparent border to npot textures and use CLAMP_TO_EDGE for the default EXTEND_NONE semantics. For anything else we can allocate a shadow npot texture and scale the original to fit that so we can map extend modes to texture sampler modes.
41 lines
1.7 KiB
Text
41 lines
1.7 KiB
Text
# Makefile.sources
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#
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# This file is pretty similar to $(top_srcdir)/src/Makefile.sources,
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# but for boilerplate. Unlike that file, there are no special headers.
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#
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cairo_boilerplate_headers = \
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cairo-boilerplate-getopt.h \
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cairo-boilerplate-scaled-font.h \
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cairo-boilerplate-system.h \
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cairo-boilerplate.h \
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$(NULL)
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cairo_boilerplate_sources = \
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cairo-boilerplate-getopt.c \
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cairo-boilerplate-system.c \
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cairo-boilerplate.c \
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$(NULL)
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cairo_boilerplate_private = \
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cairo-boilerplate-private.h \
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$(NULL)
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cairo_boilerplate_beos_cxx_sources = cairo-boilerplate-beos.cpp
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cairo_boilerplate_directfb_sources = cairo-boilerplate-directfb.c
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cairo_boilerplate_drm_sources = cairo-boilerplate-drm.c
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cairo_boilerplate_glx_sources = cairo-boilerplate-glx.c
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cairo_boilerplate_wgl_sources = cairo-boilerplate-wgl.c
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cairo_boilerplate_egl_sources = cairo-boilerplate-egl.c
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cairo_boilerplate_pdf_sources = cairo-boilerplate-pdf.c
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cairo_boilerplate_ps_sources = cairo-boilerplate-ps.c
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cairo_boilerplate_qt_cxx_sources = cairo-boilerplate-qt.cpp
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cairo_boilerplate_quartz_sources = cairo-boilerplate-quartz.c
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cairo_boilerplate_script_sources = cairo-boilerplate-script.c
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cairo_boilerplate_skia_sources = cairo-boilerplate-skia.c
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cairo_boilerplate_svg_sources = cairo-boilerplate-svg.c
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cairo_boilerplate_test_surfaces_sources = cairo-boilerplate-test-surfaces.c
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cairo_boilerplate_win32_sources = cairo-boilerplate-win32.c cairo-boilerplate-win32-printing.c
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cairo_boilerplate_xcb_sources = cairo-boilerplate-xcb.c
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cairo_boilerplate_xlib_headers = cairo-boilerplate-xlib.h
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cairo_boilerplate_xlib_sources = cairo-boilerplate-xlib.c
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cairo_boilerplate_vg_sources = cairo-boilerplate-vg.c
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cairo_boilerplate_cogl_sources = cairo-boilerplate-cogl.c
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