mirror of https://github.com/yshui/picom.git
241 lines
10 KiB
C
241 lines
10 KiB
C
// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
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#pragma once
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#include <assert.h>
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#include <ctype.h>
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#include <limits.h>
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#include <math.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <test.h>
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#include "compiler.h"
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#define ARR_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
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#ifdef __FAST_MATH__
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#warning Use of -ffast-math can cause rendering error or artifacts, \
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therefore it is not recommended.
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#endif
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#ifdef __clang__
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__attribute__((optnone))
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#else
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__attribute__((optimize("-fno-fast-math")))
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#endif
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static inline bool
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safe_isnan(double a) {
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return __builtin_isnan(a);
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}
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#define CASESTRRET(s) \
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case s: return #s
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/// Same as assert false, but make sure we abort _even in release builds_.
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/// Silence compiler warning caused by release builds making some code paths reachable.
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#define BUG() \
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do { \
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assert(false); \
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abort(); \
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} while (0)
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#define CHECK_EXPR(...) ((void)0)
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/// Same as assert, but evaluates the expression even in release builds
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#define CHECK(expr) \
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do { \
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__auto_type _ = (expr); \
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assert((CHECK_EXPR(expr), _)); \
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(void)_; \
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} while (0)
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// Some macros for checked cast
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// Note these macros are not complete, as in, they won't work for every integer types. But
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// they are good enough for compton.
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#define to_int_checked(val) \
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({ \
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int64_t tmp = (val); \
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assert(tmp >= INT_MIN && tmp <= INT_MAX); \
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(int)tmp; \
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})
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#define to_char_checked(val) \
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({ \
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int64_t tmp = (val); \
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assert(tmp >= CHAR_MIN && tmp <= CHAR_MAX); \
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(char)tmp; \
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})
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#define to_u16_checked(val) \
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({ \
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auto tmp = (val); \
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assert(tmp >= 0 && tmp <= UINT16_MAX); \
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(uint16_t) tmp; \
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})
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#define to_i16_checked(val) \
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({ \
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int64_t tmp = (val); \
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assert(tmp >= INT16_MIN && tmp <= INT16_MAX); \
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(int16_t) tmp; \
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})
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#define to_u32_checked(val) \
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({ \
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auto tmp = (val); \
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int64_t max = UINT32_MAX; /* silence clang tautological \
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comparison warning*/ \
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CHECK(tmp >= 0 && tmp <= max); \
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(uint32_t) tmp; \
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})
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/**
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* Normalize an int value to a specific range.
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*
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* @param i int value to normalize
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* @param min minimal value
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* @param max maximum value
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* @return normalized value
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*/
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static inline int attr_const normalize_i_range(int i, int min, int max) {
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if (i > max)
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return max;
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if (i < min)
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return min;
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return i;
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}
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#define min2(a, b) ((a) > (b) ? (b) : (a))
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#define max2(a, b) ((a) > (b) ? (a) : (b))
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/// clamp `val` into interval [min, max]
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#define clamp(val, min, max) max2(min2(val, max), min)
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static inline int attr_const popcountl(unsigned long a) {
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return __builtin_popcountl(a);
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}
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/**
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* Normalize a double value to a specific range.
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*
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* @param d double value to normalize
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* @param min minimal value
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* @param max maximum value
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* @return normalized value
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*/
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static inline double attr_const normalize_d_range(double d, double min, double max) {
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if (d > max)
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return max;
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if (d < min)
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return min;
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return d;
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}
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/**
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* Normalize a double value to 0.\ 0 - 1.\ 0.
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*
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* @param d double value to normalize
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* @return normalized value
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*/
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static inline double attr_const normalize_d(double d) {
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return normalize_d_range(d, 0.0, 1.0);
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}
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attr_noret void
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report_allocation_failure(const char *func, const char *file, unsigned int line);
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/**
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* @brief Quit if the passed-in pointer is empty.
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*/
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static inline void *
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allocchk_(const char *func_name, const char *file, unsigned int line, void *ptr) {
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if (unlikely(!ptr)) {
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report_allocation_failure(func_name, file, line);
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}
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return ptr;
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}
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/// @brief Wrapper of allocchk_().
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#define allocchk(ptr) allocchk_(__func__, __FILE__, __LINE__, ptr)
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/// @brief Wrapper of malloc().
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#define cmalloc(type) ((type *)allocchk(malloc(sizeof(type))))
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/// @brief Wrapper of malloc() that takes a size
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#define cvalloc(size) allocchk(malloc(size))
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/// @brief Wrapper of calloc().
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#define ccalloc(nmemb, type) \
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({ \
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auto tmp = (nmemb); \
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assert(tmp >= 0); \
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((type *)allocchk(calloc((size_t)tmp, sizeof(type)))); \
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})
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/// @brief Wrapper of ealloc().
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#define crealloc(ptr, nmemb) \
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({ \
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auto tmp = (nmemb); \
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assert(tmp >= 0); \
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((__typeof__(ptr))allocchk(realloc((ptr), (size_t)tmp * sizeof(*(ptr))))); \
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})
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/// RC_TYPE generates a reference counted type from `type`
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///
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/// parameters:
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/// name = the generated type will be called `name`_t.
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/// ctor = the constructor of `type`, will be called when
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/// a value of `type` is created. should take one
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/// argument of `type *`.
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/// dtor = the destructor. will be called when all reference
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/// is gone. has same signature as ctor
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/// Q = function qualifier. this is the qualifier that
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/// will be put before generated functions
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//
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/// functions generated:
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/// `name`_new: create a new reference counted object of `type`
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/// `name`_ref: increment the reference counter, return a
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/// reference to the object
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/// `name`_unref: decrement the reference counter. take a `type **`
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/// because it needs to nullify the reference.
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#define RC_TYPE(type, name, ctor, dtor, Q) \
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typedef struct { \
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type inner; \
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int ref_count; \
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} name##_internal_t; \
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typedef type name##_t; \
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Q type *name##_new(void) { \
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name##_internal_t *ret = cmalloc(name##_internal_t); \
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ctor((type *)ret); \
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ret->ref_count = 1; \
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return (type *)ret; \
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} \
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Q type *name##_ref(type *a) { \
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__auto_type b = (name##_internal_t *)a; \
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b->ref_count++; \
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return a; \
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} \
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Q void name##_unref(type **a) { \
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__auto_type b = (name##_internal_t *)*a; \
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if (!b) \
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return; \
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b->ref_count--; \
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if (!b->ref_count) { \
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dtor((type *)b); \
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free(b); \
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} \
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*a = NULL; \
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}
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/// Generate prototypes for functions generated by RC_TYPE
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#define RC_TYPE_PROTO(type, name) \
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typedef type name##_t; \
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type *name##_new(void); \
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void name##_ref(type *a); \
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void name##_unref(type **a);
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// vim: set noet sw=8 ts=8 :
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