mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
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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 KiB
Text
41 lines
1 KiB
Text
# Generated by configure. Modify to customize.
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CAIRO_HAS_XLIB_SURFACE=0
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CAIRO_HAS_XLIB_XRENDER_SURFACE=0
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CAIRO_HAS_XCB_SURFACE=0
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CAIRO_HAS_XLIB_XCB_FUNCTIONS=0
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CAIRO_HAS_XCB_SHM_FUNCTIONS=0
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CAIRO_HAS_QT_SURFACE=0
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CAIRO_HAS_QUARTZ_SURFACE=0
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CAIRO_HAS_QUARTZ_FONT=0
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CAIRO_HAS_QUARTZ_IMAGE_SURFACE=0
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CAIRO_HAS_WIN32_SURFACE=1
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CAIRO_HAS_WIN32_FONT=1
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CAIRO_HAS_SKIA_SURFACE=0
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CAIRO_HAS_OS2_SURFACE=0
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CAIRO_HAS_BEOS_SURFACE=0
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CAIRO_HAS_DRM_SURFACE=0
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CAIRO_HAS_GALLIUM_SURFACE=0
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CAIRO_HAS_PNG_FUNCTIONS=1
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CAIRO_HAS_GL_SURFACE=0
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CAIRO_HAS_GLESV2_SURFACE=0
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CAIRO_HAS_COGL_SURFACE=0
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CAIRO_HAS_DIRECTFB_SURFACE=0
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CAIRO_HAS_VG_SURFACE=0
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CAIRO_HAS_EGL_FUNCTIONS=0
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CAIRO_HAS_GLX_FUNCTIONS=0
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CAIRO_HAS_WGL_FUNCTIONS=0
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CAIRO_HAS_SCRIPT_SURFACE=1
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CAIRO_HAS_FT_FONT=0
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CAIRO_HAS_FC_FONT=0
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CAIRO_HAS_PS_SURFACE=1
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CAIRO_HAS_PDF_SURFACE=1
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CAIRO_HAS_SVG_SURFACE=1
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CAIRO_HAS_TEST_SURFACES=0
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CAIRO_HAS_TEE_SURFACE=0
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CAIRO_HAS_XML_SURFACE=0
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CAIRO_HAS_PTHREAD=0
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CAIRO_HAS_GOBJECT_FUNCTIONS=0
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CAIRO_HAS_TRACE=0
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CAIRO_HAS_INTERPRETER=1
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CAIRO_HAS_SYMBOL_LOOKUP=0
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