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Diffstat (limited to 'source/blender/blenlib/BLI_buffer.h')
-rw-r--r--source/blender/blenlib/BLI_buffer.h90
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diff --git a/source/blender/blenlib/BLI_buffer.h b/source/blender/blenlib/BLI_buffer.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BLI_BUFFER_H__
+#define __BLI_BUFFER_H__
+
+/* Note: this more or less fills same purpose as BLI_array, but makes
+ * it much easier to resize the array outside of the function it was
+ * declared in since */
+
+/* Usage examples:
+ *
+ * {
+ * BLI_buffer_declare_static(int, my_int_array, BLI_BUFFER_NOP, 32);
+ *
+ * BLI_buffer_append(my_int_array, int, 42);
+ * assert(my_int_array.count == 1);
+ * assert(BLI_buffer_at(my_int_array, int, 0) == 42);
+ *
+ * BLI_buffer_free(&my_int_array);
+ * }
+ */
+
+typedef struct {
+ void *data;
+ const int elem_size;
+ int count, alloc_count;
+ int flag;
+} BLI_Buffer;
+
+enum {
+ BLI_BUFFER_NOP = 0,
+ BLI_BUFFER_USE_STATIC = (1 << 0),
+ BLI_BUFFER_USE_CALLOC = (1 << 1), /* ensure the array is always calloc'd */
+};
+
+#define BLI_buffer_declare_static(type_, name_, flag_, static_count_) \
+ type_ *name_ ## _static_[static_count_]; \
+ BLI_Buffer name_ = { \
+ /* clear the static memory if this is a calloc'd array */ \
+ ((void)((flag_ & BLI_BUFFER_USE_CALLOC) ? \
+ memset(name_ ## _static_, 0, sizeof(name_ ## _static_)) : 0\
+ ), /* memset-end */ \
+ name_ ## _static_), \
+ sizeof(type_), \
+ 0, \
+ static_count_, \
+ BLI_BUFFER_USE_STATIC | flag_}
+
+/* never use static*/
+#define BLI_buffer_declare(type_, name_, flag_) \
+ BLI_Buffer name_ = {NULL, \
+ sizeof(type_), \
+ 0, \
+ 0, \
+ flag_}
+
+
+#define BLI_buffer_at(buffer_, type_, index_) ( \
+ (((type_ *)(buffer_)->data)[(BLI_assert(sizeof(type_) == (buffer_)->elem_size)), index_]))
+
+#define BLI_buffer_append(buffer_, type_, val_) ( \
+ BLI_buffer_resize(buffer_, (buffer_)->count + 1), \
+ (BLI_buffer_at(buffer_, type_, (buffer_)->count - 1) = val_) \
+)
+
+/* Never decreases the amount of memory allocated */
+void BLI_buffer_resize(BLI_Buffer *buffer, int new_count);
+
+/* Does not free the buffer structure itself */
+void BLI_buffer_free(BLI_Buffer *buffer);
+
+#endif /* __BLI_BUFFER_H__ */