Enable building pdf_use_skia in the standalone build.

This CL adds the necessary pieces so you can add pdf_use_skia=1 to GYP_DEFINES
and do a standalone build.

R=caryclark@google.com

Review URL: https://codereview.chromium.org/1812563002 .

1 files changed, 268 insertions, 0 deletions

diff --git a/skia/config/SkUserConfig.h b/skia/config/SkUserConfig.h
new file mode 100644
index 0000000000..2f13fda7b5
--- /dev/null
+++ b/skia/config/SkUserConfig.h
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SKIA_CONFIG_SKUSERCONFIG_H_
+#define SKIA_CONFIG_SKUSERCONFIG_H_
+
+/*  SkTypes.h, the root of the public header files, does the following trick:
+
+    #include <SkPreConfig.h>
+    #include <SkUserConfig.h>
+    #include <SkPostConfig.h>
+
+    SkPreConfig.h runs first, and it is responsible for initializing certain
+    skia defines.
+
+    SkPostConfig.h runs last, and its job is to just check that the final
+    defines are consistent (i.e. that we don't have mutually conflicting
+    defines).
+
+    SkUserConfig.h (this file) runs in the middle. It gets to change or augment
+    the list of flags initially set in preconfig, and then postconfig checks
+    that everything still makes sense.
+
+    Below are optional defines that add, subtract, or change default behavior
+    in Skia. Your port can locally edit this file to enable/disable flags as
+    you choose, or these can be delared on your command line (i.e. -Dfoo).
+
+    By default, this include file will always default to having all of the flags
+    commented out, so including it will have no effect.
+*/
+
+///////////////////////////////////////////////////////////////////////////////
+
+/*  Skia has lots of debug-only code. Often this is just null checks or other
+    parameter checking, but sometimes it can be quite intrusive (e.g. check that
+    each 32bit pixel is in premultiplied form). This code can be very useful
+    during development, but will slow things down in a shipping product.
+
+    By default, these mutually exclusive flags are defined in SkPreConfig.h,
+    based on the presence or absence of NDEBUG, but that decision can be changed
+    here.
+ */
+// #define SK_DEBUG
+// #define SK_RELEASE
+
+// #ifdef DCHECK_ALWAYS_ON
+//     #undef SK_RELEASE
+//     #define SK_DEBUG
+// #endif
+
+/*  If, in debugging mode, Skia needs to stop (presumably to invoke a debugger)
+    it will call SK_CRASH(). If this is not defined it, it is defined in
+    SkPostConfig.h to write to an illegal address
+ */
+// #define SK_CRASH() *(int *)(uintptr_t)0 = 0
+
+/*  preconfig will have attempted to determine the endianness of the system,
+    but you can change these mutually exclusive flags here.
+ */
+// #define SK_CPU_BENDIAN
+// #define SK_CPU_LENDIAN
+
+/*  If zlib is available and you want to support the flate compression
+    algorithm (used in PDF generation), define SK_ZLIB_INCLUDE to be the
+    include path.
+ */
+// #define SK_ZLIB_INCLUDE <zlib.h>
+
+/*  Define this to allow PDF scalars above 32k.  The PDF/A spec doesn't allow
+    them, but modern PDF interpreters should handle them just fine.
+ */
+// #define SK_ALLOW_LARGE_PDF_SCALARS
+
+/*  Define this to provide font subsetter for font subsetting when generating
+    PDF documents.
+ */
+// #define SK_SFNTLY_SUBSETTER \
+//    "third_party/sfntly/src/cpp/src/sample/chromium/font_subsetter.h"
+
+/*  To write debug messages to a console, skia will call SkDebugf(...) following
+    printf conventions (e.g. const char* format, ...). If you want to redirect
+    this to something other than printf, define yours here
+ */
+// #define SkDebugf(...)  MyFunction(__VA_ARGS__)
+
+/*  If SK_DEBUG is defined, then you can optionally define SK_SUPPORT_UNITTEST
+    which will run additional self-tests at startup. These can take a long time,
+    so this flag is optional.
+ */
+#ifdef SK_DEBUG
+#define SK_SUPPORT_UNITTEST
+#endif
+
+/* If cross process SkPictureImageFilters are not explicitly enabled then
+   they are always disabled.
+ */
+#ifndef SK_ALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS
+#ifndef SK_DISALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS
+#define SK_DISALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS
+#endif
+#endif
+
+/* If your system embeds skia and has complex event logging, define this
+   symbol to name a file that maps the following macros to your system's
+   equivalents:
+       SK_TRACE_EVENT0(event)
+       SK_TRACE_EVENT1(event, name1, value1)
+       SK_TRACE_EVENT2(event, name1, value1, name2, value2)
+   src/utils/SkDebugTrace.h has a trivial implementation that writes to
+   the debug output stream. If SK_USER_TRACE_INCLUDE_FILE is not defined,
+   SkTrace.h will define the above three macros to do nothing.
+*/
+#undef SK_USER_TRACE_INCLUDE_FILE
+
+// ===== Begin Chrome-specific definitions =====
+
+#define SK_SCALAR_IS_FLOAT
+#undef SK_SCALAR_IS_FIXED
+
+#define SK_MSCALAR_IS_FLOAT
+#undef SK_MSCALAR_IS_DOUBLE
+
+#define GR_MAX_OFFSCREEN_AA_DIM 512
+
+// Log the file and line number for assertions.
+#define SkDebugf(...) SkDebugf_FileLine(__FILE__, __LINE__, false, __VA_ARGS__)
+SK_API void SkDebugf_FileLine(const char* file,
+                              int line,
+                              bool fatal,
+                              const char* format,
+                              ...);
+
+// Marking the debug print as "fatal" will cause a debug break, so we don't need
+// a separate crash call here.
+#define SK_DEBUGBREAK(cond)                                           \
+  do {                                                                \
+    if (!(cond)) {                                                    \
+      SkDebugf_FileLine(__FILE__, __LINE__, true,                     \
+                        "%s:%d: failed assertion \"%s\"\n", __FILE__, \
+                        __LINE__, #cond);                             \
+    }                                                                 \
+  } while (false)
+
+#if !defined(ANDROID)  // On Android, we use the skia default settings.
+#define SK_A32_SHIFT 24
+#define SK_R32_SHIFT 16
+#define SK_G32_SHIFT 8
+#define SK_B32_SHIFT 0
+#endif
+
+#if defined(SK_BUILD_FOR_WIN32)
+
+#define SK_BUILD_FOR_WIN
+
+// Skia uses this deprecated bzero function to fill zeros into a string.
+#define bzero(str, len) memset(str, 0, len)
+
+#elif defined(SK_BUILD_FOR_MAC)
+
+#define SK_CPU_LENDIAN
+#undef SK_CPU_BENDIAN
+
+#elif defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_ANDROID)
+
+// Prefer FreeType's emboldening algorithm to Skia's
+// TODO: skia used to just use hairline, but has improved since then, so
+// we should revisit this choice...
+#define SK_USE_FREETYPE_EMBOLDEN
+
+#if defined(SK_BUILD_FOR_UNIX) && defined(SK_CPU_BENDIAN)
+// Above we set the order for ARGB channels in registers. I suspect that, on
+// big endian machines, you can keep this the same and everything will work.
+// The in-memory order will be different, of course, but as long as everything
+// is reading memory as words rather than bytes, it will all work. However, if
+// you find that colours are messed up I thought that I would leave a helpful
+// locator for you. Also see the comments in
+// base/gfx/bitmap_platform_device_linux.h
+#error Read the comment at this location
+#endif
+
+#endif
+
+// The default crash macro writes to badbeef which can cause some strange
+// problems. Instead, pipe this through to the logging function as a fatal
+// assertion.
+#define SK_CRASH() SkDebugf_FileLine(__FILE__, __LINE__, true, "SK_CRASH")
+
+// These flags are no longer defined in Skia, but we have them (temporarily)
+// until we update our call-sites (typically these are for API changes).
+//
+// Remove these as we update our sites.
+//
+#ifndef SK_SUPPORT_LEGACY_GETTOPDEVICE
+#define SK_SUPPORT_LEGACY_GETTOPDEVICE
+#endif
+
+#ifndef SK_SUPPORT_LEGACY_GETDEVICE
+#define SK_SUPPORT_LEGACY_GETDEVICE
+#endif
+
+// Workaround for poor anisotropic mipmap quality,
+// pending Skia ripmap support.
+// (https://bugs.chromium.org/p/skia/issues/detail?id=4863)
+#ifndef SK_SUPPORT_LEGACY_ANISOTROPIC_MIPMAP_SCALE
+#define SK_SUPPORT_LEGACY_ANISOTROPIC_MIPMAP_SCALE
+#endif
+
+#ifndef SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX
+#define SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX
+#endif
+
+#ifndef SK_IGNORE_ETC1_SUPPORT
+#define SK_IGNORE_ETC1_SUPPORT
+#endif
+
+#ifndef SK_IGNORE_GPU_DITHER
+#define SK_IGNORE_GPU_DITHER
+#endif
+
+#ifndef SK_SUPPORT_LEGACY_EVAL_CUBIC
+#define SK_SUPPORT_LEGACY_EVAL_CUBIC
+#endif
+
+///////////////////////// Imported from BUILD.gn and skia_common.gypi
+
+/* In some places Skia can use static initializers for global initialization,
+ *  or fall back to lazy runtime initialization. Chrome always wants the latter.
+ */
+#define SK_ALLOW_STATIC_GLOBAL_INITIALIZERS 0
+
+/* This flag forces Skia not to use typographic metrics with GDI.
+ */
+#define SK_GDI_ALWAYS_USE_TEXTMETRICS_FOR_FONT_METRICS
+
+#define SK_IGNORE_BLURRED_RRECT_OPT
+#define SK_USE_DISCARDABLE_SCALEDIMAGECACHE
+#define SK_WILL_NEVER_DRAW_PERSPECTIVE_TEXT
+
+#define SK_ATTR_DEPRECATED SK_NOTHING_ARG1
+#define SK_ENABLE_INST_COUNT 0
+#define GR_GL_CUSTOM_SETUP_HEADER "GrGLConfig_chrome.h"
+
+// Blink layout tests are baselined to Clang optimizing through the UB in
+// SkDivBits.
+#define SK_SUPPORT_LEGACY_DIVBITS_UB
+
+// mtklein's fiddling with Src / SrcOver.  Will rebaseline these only once when
+// done.
+#define SK_SUPPORT_LEGACY_X86_BLITS
+
+#define SK_DISABLE_TILE_IMAGE_FILTER_OPTIMIZATION
+
+// ===== End Chrome-specific definitions =====
+
+#endif  // SKIA_CONFIG_SKUSERCONFIG_H_