skia/config/SkUserConfig.h

   1 /*
   2  * Copyright (C) 2006 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef SkUserConfig_DEFINED
  18 #define SkUserConfig_DEFINED
  19
  20 /*  SkTypes.h, the root of the public header files, does the following trick:
  21
  22     #include <SkPreConfig.h>
  23     #include <SkUserConfig.h>
  24     #include <SkPostConfig.h>
  25
  26     SkPreConfig.h runs first, and it is responsible for initializing certain
  27     skia defines.
  28
  29     SkPostConfig.h runs last, and its job is to just check that the final
  30     defines are consistent (i.e. that we don't have mutually conflicting
  31     defines).
  32
  33     SkUserConfig.h (this file) runs in the middle. It gets to change or augment
  34     the list of flags initially set in preconfig, and then postconfig checks
  35     that everything still makes sense.
  36
  37     Below are optional defines that add, subtract, or change default behavior
  38     in Skia. Your port can locally edit this file to enable/disable flags as
  39     you choose, or these can be delared on your command line (i.e. -Dfoo).
  40
  41     By default, this include file will always default to having all of the flags
  42     commented out, so including it will have no effect.
  43 */
  44
  45 ///////////////////////////////////////////////////////////////////////////////
  46
  47 /*  Scalars (the fractional value type in skia) can be implemented either as
  48     floats or 16.16 integers (fixed). Exactly one of these two symbols must be
  49     defined.
  50 */
  51 //#define SK_SCALAR_IS_FLOAT
  52 //#define SK_SCALAR_IS_FIXED
  53
  54
  55 /*  Somewhat independent of how SkScalar is implemented, Skia also wants to know
  56     if it can use floats at all. Naturally, if SK_SCALAR_IS_FLOAT is defined,
  57     then so muse SK_CAN_USE_FLOAT, but if scalars are fixed, SK_CAN_USE_FLOAT
  58     can go either way.
  59  */
  60 //#define SK_CAN_USE_FLOAT
  61
  62 /*  For some performance-critical scalar operations, skia will optionally work
  63     around the standard float operators if it knows that the CPU does not have
  64     native support for floats. If your environment uses software floating point,
  65     define this flag.
  66  */
  67 //#define SK_SOFTWARE_FLOAT
  68
  69
  70 /*  Skia has lots of debug-only code. Often this is just null checks or other
  71     parameter checking, but sometimes it can be quite intrusive (e.g. check that
  72     each 32bit pixel is in premultiplied form). This code can be very useful
  73     during development, but will slow things down in a shipping product.
  74
  75     By default, these mutually exclusive flags are defined in SkPreConfig.h,
  76     based on the presence or absence of NDEBUG, but that decision can be changed
  77     here.
  78  */
  79 //#define SK_DEBUG
  80 //#define SK_RELEASE
  81
  82
  83 /*  If, in debugging mode, Skia needs to stop (presumably to invoke a debugger)
  84     it will call SK_CRASH(). If this is not defined it, it is defined in
  85     SkPostConfig.h to write to an illegal address
  86  */
  87 //#define SK_CRASH() *(int *)(uintptr_t)0 = 0
  88
  89
  90 /*  preconfig will have attempted to determine the endianness of the system,
  91     but you can change these mutually exclusive flags here.
  92  */
  93 //#define SK_CPU_BENDIAN
  94 //#define SK_CPU_LENDIAN
  95
  96
  97 /*  Some compilers don't support long long for 64bit integers. If yours does
  98     not, define this to the appropriate type.
  99  */
 100 //#define SkLONGLONG int64_t
 101
 102
 103 /*  Some envorinments do not suport writable globals (eek!). If yours does not,
 104     define this flag.
 105  */
 106 //#define SK_USE_RUNTIME_GLOBALS
 107
 108 /*  If zlib is available and you want to support the flate compression
 109     algorithm (used in PDF generation), define SK_ZLIB_INCLUDE to be the
 110     include path.
 111  */
 112 //#define SK_ZLIB_INCLUDE <zlib.h>
 113 #define SK_ZLIB_INCLUDE "third_party/zlib/zlib.h"
 114
 115 /*  Define this to allow PDF scalars above 32k.  The PDF/A spec doesn't allow
 116     them, but modern PDF interpreters should handle them just fine.
 117  */
 118 //#define SK_ALLOW_LARGE_PDF_SCALARS
 119
 120 /*  Define this to provide font subsetter for font subsetting when generating
 121     PDF documents.
 122  */
 123 #define SK_SFNTLY_SUBSETTER \
 124     "third_party/sfntly/cpp/src/sample/chromium/font_subsetter.h"
 125
 126 /*  Define this to remove dimension checks on bitmaps. Not all blits will be
 127     correct yet, so this is mostly for debugging the implementation.
 128  */
 129 //#define SK_ALLOW_OVER_32K_BITMAPS
 130
 131
 132 /*  To write debug messages to a console, skia will call SkDebugf(...) following
 133     printf conventions (e.g. const char* format, ...). If you want to redirect
 134     this to something other than printf, define yours here
 135  */
 136 //#define SkDebugf(...)  MyFunction(__VA_ARGS__)
 137
 138
 139 /*  If SK_DEBUG is defined, then you can optionally define SK_SUPPORT_UNITTEST
 140     which will run additional self-tests at startup. These can take a long time,
 141     so this flag is optional.
 142  */
 143 #ifdef SK_DEBUG
 144 #define SK_SUPPORT_UNITTEST
 145 #endif
 146
 147 /* If your system embeds skia and has complex event logging, define this
 148    symbol to name a file that maps the following macros to your system's
 149    equivalents:
 150        SK_TRACE_EVENT0(event)
 151        SK_TRACE_EVENT1(event, name1, value1)
 152        SK_TRACE_EVENT2(event, name1, value1, name2, value2)
 153    src/utils/SkDebugTrace.h has a trivial implementation that writes to
 154    the debug output stream. If SK_USER_TRACE_INCLUDE_FILE is not defined,
 155    SkTrace.h will define the above three macros to do nothing.
 156 */
 157 #undef SK_USER_TRACE_INCLUDE_FILE
 158
 159 // ===== Begin Chrome-specific definitions =====
 160
 161 #define SK_SCALAR_IS_FLOAT
 162 #undef SK_SCALAR_IS_FIXED
 163
 164 #define SK_MSCALAR_IS_DOUBLE
 165 #undef SK_MSCALAR_IS_FLOAT
 166
 167 #define GR_MAX_OFFSCREEN_AA_DIM     512
 168
 169 // Log the file and line number for assertions.
 170 #define SkDebugf(...) SkDebugf_FileLine(__FILE__, __LINE__, false, __VA_ARGS__)
 171 SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 172                               const char* format, ...);
 173
 174 // Marking the debug print as "fatal" will cause a debug break, so we don't need
 175 // a separate crash call here.
 176 #define SK_DEBUGBREAK(cond) do { if (!(cond)) { \
 177     SkDebugf_FileLine(__FILE__, __LINE__, true, \
 178     "%s:%d: failed assertion \"%s\"\n", \
 179     __FILE__, __LINE__, #cond); } } while (false)
 180
 181 #if !defined(ANDROID)   // On Android, we use the skia default settings.
 182 #define SK_A32_SHIFT    24
 183 #define SK_R32_SHIFT    16
 184 #define SK_G32_SHIFT    8
 185 #define SK_B32_SHIFT    0
 186 #endif
 187
 188 #if defined(SK_BUILD_FOR_WIN32)
 189
 190 #define SK_BUILD_FOR_WIN
 191
 192 // VC8 doesn't support stdint.h, so we define those types here.
 193 #define SK_IGNORE_STDINT_DOT_H
 194 typedef signed char int8_t;
 195 typedef unsigned char uint8_t;
 196 typedef short int16_t;
 197 typedef unsigned short uint16_t;
 198 typedef int int32_t;
 199 typedef unsigned uint32_t;
 200
 201 // VC doesn't support __restrict__, so make it a NOP.
 202 #undef SK_RESTRICT
 203 #define SK_RESTRICT
 204
 205 // Skia uses this deprecated bzero function to fill zeros into a string.
 206 #define bzero(str, len) memset(str, 0, len)
 207
 208 #elif defined(SK_BUILD_FOR_MAC)
 209
 210 #define SK_CPU_LENDIAN
 211 #undef  SK_CPU_BENDIAN
 212
 213 #elif defined(SK_BUILD_FOR_UNIX)
 214
 215 // Prefer FreeType's emboldening algorithm to Skia's
 216 // TODO: skia used to just use hairline, but has improved since then, so
 217 // we should revisit this choice...
 218 #define SK_USE_FREETYPE_EMBOLDEN
 219
 220 #ifdef SK_CPU_BENDIAN
 221 // Above we set the order for ARGB channels in registers. I suspect that, on
 222 // big endian machines, you can keep this the same and everything will work.
 223 // The in-memory order will be different, of course, but as long as everything
 224 // is reading memory as words rather than bytes, it will all work. However, if
 225 // you find that colours are messed up I thought that I would leave a helpful
 226 // locator for you. Also see the comments in
 227 // base/gfx/bitmap_platform_device_linux.h
 228 #error Read the comment at this location
 229 #endif
 230
 231 #endif
 232
 233 // The default crash macro writes to badbeef which can cause some strange
 234 // problems. Instead, pipe this through to the logging function as a fatal
 235 // assertion.
 236 #define SK_CRASH() SkDebugf_FileLine(__FILE__, __LINE__, true, "SK_CRASH")
 237
 238 // Uncomment the following line to forward skia trace events to Chrome
 239 // tracing.
 240 // #define SK_USER_TRACE_INCLUDE_FILE "skia/ext/skia_trace_shim.h"
 241
 242 // ===== End Chrome-specific definitions =====
 243
 244 #endif