Noel Grandin
088a7c7c45
and render to a combined color+alpha bitmap
The strategy is to remove the mpAlphaVDev from OutputDevice,
and have the OutputDevice create 32-bit SalBitmap's
and then have the various backends correctly render to
those 32-bit bitmaps.
However, whenever we extract a BitmapEx from OutputDevice
(e.g. via VirtualDevice) and hand it to the rest of the
system, we split the color and alpha information.
So the rest of the codebase doesn't have to deal with
this yet.
We have some major problems to overcome here:
(*) Cairo uses 32-bit data, even if we ask for 24-bit color with no alpha.
This is because the current version of cairo does not support RGB 24-bit data.
(*) Sometimes we want the bitmap to be initialised with an opaque white background,
sometimes we want it to be transparent.
(*) Sometimes when we extract a bitmap from a device, we want the alpha channel,
sometimes not.
(*) There are lots of left-over bits of previous attempts of this change lying around,
e.g. in skia.
Notes
(*) we allow Bitmap (ie. SalBitmap) to hold color+alpha
(*) The BitmapEx(Bitmap) constructor checks if the incoming
Bitmap is color+alpha, and if so, splits into a color bitmap and an alpha bitmap
(*) Because the underlying image data is stored pre-multipled, if
we write a transparent pixel with color, and then read the pixel value back,
we might lose the color information.
Change-Id: I0fc0042d6e5be5edd99b320892fb00a8eb2842fe
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173937
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/*
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Settings for the Skia library. We compile the Skia library with these
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settings and also LO code uses this header to ensure the settings
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are the same.
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*/
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#ifndef CONFIG_SKIA_H
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#define CONFIG_SKIA_H
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// GPU support (set by configure).
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#undef SK_GANESH
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// Vulkan support enabled (set by configure).
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#undef SK_VULKAN
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// Metal support enabled (set by configure).
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#undef SK_METAL
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// Memory allocator for Vulkan.
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#define SK_USE_VMA 1
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// Enable Vulkan validation layers (set by configure).
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#undef SK_ENABLE_VK_LAYERS
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#define SK_CODEC_DECODES_PNG 1
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#define SK_ENCODE_PNG 1
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// tdf#166339: Gamma-correct text rendering is needed for subpixel antialiasing
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// to work properly. This option may make some text appear fainter than in other
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// backends, but that is because the other backends don't handle gamma correctly.
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#define SK_GAMMA_APPLY_TO_A8 1
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// Platform-specific font gamma tuning to recover some contrast while still
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// reducing artifacts. Most values are from BUILD.gn.
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#if defined(_WIN32)
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#define SK_GAMMA_SRGB 1
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#define SK_GAMMA_CONTRAST 0.75
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#elif defined(__APPLE__)
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#define SK_GAMMA_SRGB 1
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#define SK_GAMMA_CONTRAST 0.0
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#else
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#define SK_GAMMA_EXPONENT 1.2
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#define SK_GAMMA_CONTRAST 0.2
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#endif
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// These are just to avoid warnings (some headers use them even with GL disabled).
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#define SK_ASSUME_GL 1
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#define SK_ASSUME_GL_ES 0
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#define SK_ENABLE_SKSL 1
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// See https://codereview.chromium.org/2089583002 . This makes raster drawing
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// faster in some cases, it was made conditional because of some tests failing,
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// but if I'm reading the review correctly the code is in fact fine and just
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// those tests needed updating, which presumably has never happened.
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#define SK_DRAWBITMAPRECT_FAST_OFFSET 1
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// Default to BGRA. Skia already defaults to that on Windows, and it seems
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// the default X11 visual is actually also BGRA.
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#define SK_R32_SHIFT 16
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// Enable Skia's internal checks depending on DBG_UTIL mode.
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// ENABLE_SKIA_DEBUG controls whether to build with or without optimizations, and
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// is set by using --enable-skia=debug.
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#ifdef DBG_UTIL
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#define SK_DEBUG
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#define SK_ENABLE_DUMP_GPU
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#else
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#define SK_RELEASE
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#endif // DBG_UTIL
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// TODO ?
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//#define SK_R32_SHIFT 16
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#endif
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