From 7486263f7eef9c8118e43f5772e7425fbcf1ce9d Mon Sep 17 00:00:00 2001 From: Drew DeVault Date: Mon, 7 Aug 2017 21:13:04 -0400 Subject: Add xcursor sublibrary --- xcursor/meson.build | 4 + xcursor/wlr_cursor.c | 317 +++++++++++++++++ xcursor/xcursor.c | 970 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1291 insertions(+) create mode 100644 xcursor/meson.build create mode 100644 xcursor/wlr_cursor.c create mode 100644 xcursor/xcursor.c (limited to 'xcursor') diff --git a/xcursor/meson.build b/xcursor/meson.build new file mode 100644 index 00000000..570d1fe1 --- /dev/null +++ b/xcursor/meson.build @@ -0,0 +1,4 @@ +wlr_files += files( + 'xcursor.c', + 'wlr_cursor.c', +) diff --git a/xcursor/wlr_cursor.c b/xcursor/wlr_cursor.c new file mode 100644 index 00000000..c42f3d02 --- /dev/null +++ b/xcursor/wlr_cursor.c @@ -0,0 +1,317 @@ +/* + * Copyright © 2012 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial + * portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#define _XOPEN_SOURCE 500 +#include +#include +#include +#include +#include +#include +#include "xcursor/xcursor.h" + +static void wlr_cursor_destroy(struct wlr_cursor *cursor) { + for (size_t i = 0; i < cursor->image_count; i++) { + free(cursor->images[i]->buffer); + free(cursor->images[i]); + } + + free(cursor->images); + free(cursor->name); + free(cursor); +} + +#include "xcursor/cursor_data.h" + +static struct wlr_cursor *wlr_cursor_create_from_data( + struct cursor_metadata *metadata, struct wlr_cursor_theme *theme) { + struct wlr_cursor *cursor; + struct wlr_cursor_image *image; + int size; + + cursor = malloc(sizeof(*cursor)); + if (!cursor) { + return NULL; + } + + cursor->image_count = 1; + cursor->images = malloc(sizeof(*cursor->images)); + if (!cursor->images) { + goto err_free_cursor; + } + + cursor->name = strdup(metadata->name); + cursor->total_delay = 0; + + image = malloc(sizeof(*image)); + if (!image) { + goto err_free_images; + } + + cursor->images[0] = image; + image->buffer = NULL; + image->width = metadata->width; + image->height = metadata->height; + image->hotspot_x = metadata->hotspot_x; + image->hotspot_y = metadata->hotspot_y; + image->delay = 0; + + size = metadata->width * metadata->height * sizeof(uint32_t); + image->buffer = malloc(size); + + if (!image->buffer) { + goto err_free_image; + } + + memcpy(image->buffer, cursor_data + metadata->offset, size); + + return cursor; + +err_free_image: + free(image); + +err_free_images: + free(cursor->name); + free(cursor->images); + +err_free_cursor: + free(cursor); + return NULL; +} + +static void load_default_theme(struct wlr_cursor_theme *theme) { + uint32_t i; + + free(theme->name); + theme->name = strdup("default"); + + theme->cursor_count = sizeof(cursor_metadata) / sizeof(cursor_metadata[0]); + theme->cursors = malloc(theme->cursor_count * sizeof(*theme->cursors)); + + if (theme->cursors == NULL) { + theme->cursor_count = 0; + return; + } + + for (i = 0; i < theme->cursor_count; ++i) { + theme->cursors[i] = + wlr_cursor_create_from_data(&cursor_metadata[i], theme); + + if (theme->cursors[i] == NULL) { + break; + } + } + theme->cursor_count = i; +} + +static struct wlr_cursor *wlr_cursor_create_from_xcursor_images( + XcursorImages *images, struct wlr_cursor_theme *theme) { + struct wlr_cursor *cursor; + struct wlr_cursor_image *image; + int i, size; + + cursor = malloc(sizeof(*cursor)); + if (!cursor) { + return NULL; + } + + cursor->images = malloc(images->nimage * sizeof(cursor->images[0])); + if (!cursor->images) { + free(cursor); + return NULL; + } + + cursor->name = strdup(images->name); + cursor->total_delay = 0; + + for (i = 0; i < images->nimage; i++) { + image = malloc(sizeof(*image)); + if (image == NULL) { + break; + } + + image->buffer = NULL; + + image->width = images->images[i]->width; + image->height = images->images[i]->height; + image->hotspot_x = images->images[i]->xhot; + image->hotspot_y = images->images[i]->yhot; + image->delay = images->images[i]->delay; + + size = image->width * image->height * 4; + image->buffer = malloc(size); + if (!image->buffer) { + free(image); + break; + } + + /* copy pixels to shm pool */ + memcpy(image->buffer, images->images[i]->pixels, size); + cursor->total_delay += image->delay; + cursor->images[i] = image; + } + cursor->image_count = i; + + if (cursor->image_count == 0) { + free(cursor->name); + free(cursor->images); + free(cursor); + return NULL; + } + + return cursor; +} + +static void load_callback(XcursorImages *images, void *data) { + struct wlr_cursor_theme *theme = data; + struct wlr_cursor *cursor; + + if (wlr_cursor_theme_get_cursor(theme, images->name)) { + XcursorImagesDestroy(images); + return; + } + + cursor = wlr_cursor_create_from_xcursor_images(images, theme); + + if (cursor) { + theme->cursor_count++; + theme->cursors = + realloc(theme->cursors, + theme->cursor_count * sizeof(theme->cursors[0])); + + if (theme->cursors == NULL) { + theme->cursor_count--; + free(cursor); + } else { + theme->cursors[theme->cursor_count - 1] = cursor; + } + } + + XcursorImagesDestroy(images); +} + +struct wlr_cursor_theme *wlr_cursor_theme_load(const char *name, int size) { + struct wlr_cursor_theme *theme; + + theme = malloc(sizeof(*theme)); + if (!theme) { + return NULL; + } + + if (!name) { + name = "default"; + } + + theme->name = strdup(name); + if (!theme->name) { + goto out_error_name; + } + theme->size = size; + theme->cursor_count = 0; + theme->cursors = NULL; + + xcursor_load_theme(name, size, load_callback, theme); + + if (theme->cursor_count == 0) { + load_default_theme(theme); + } + + return theme; + +out_error_name: + free(theme); + return NULL; +} + +void wlr_cursor_theme_destroy(struct wlr_cursor_theme *theme) { + unsigned int i; + + for (i = 0; i < theme->cursor_count; i++) { + wlr_cursor_destroy(theme->cursors[i]); + } + + free(theme->name); + free(theme->cursors); + free(theme); +} + +struct wlr_cursor *wlr_cursor_theme_get_cursor(struct wlr_cursor_theme *theme, + const char *name) { + unsigned int i; + + for (i = 0; i < theme->cursor_count; i++) { + if (strcmp(name, theme->cursors[i]->name) == 0) { + return theme->cursors[i]; + } + } + + return NULL; +} + +static int wlr_cursor_frame_and_duration(struct wlr_cursor *cursor, + uint32_t time, uint32_t *duration) { + uint32_t t; + int i; + + if (cursor->image_count == 1) { + if (duration) { + *duration = 0; + } + return 0; + } + + i = 0; + t = time % cursor->total_delay; + + /* If there is a 0 delay in the image set then this + * loop breaks on it and we display that cursor until + * time % cursor->total_delay wraps again. + * Since a 0 delay is silly, and we've never actually + * seen one in a cursor file, we haven't bothered to + * "fix" this. + */ + while (t - cursor->images[i]->delay < t) { + t -= cursor->images[i++]->delay; + } + + if (!duration) { + return i; + } + + /* Make sure we don't accidentally tell the caller this is + * a static cursor image. + */ + if (t >= cursor->images[i]->delay) { + *duration = 1; + } else { + *duration = cursor->images[i]->delay - t; + } + + return i; +} + +int wlr_cursor_frame(struct wlr_cursor *_cursor, uint32_t time) { + return wlr_cursor_frame_and_duration(_cursor, time, NULL); +} diff --git a/xcursor/xcursor.c b/xcursor/xcursor.c new file mode 100644 index 00000000..8dc35a7c --- /dev/null +++ b/xcursor/xcursor.c @@ -0,0 +1,970 @@ +/* + * Copyright © 2002 Keith Packard + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial + * portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#define _DEFAULT_SOURCE +#include "xcursor/xcursor.h" +#include +#include +#include +#include + +/* + * From libXcursor/include/X11/extensions/Xcursor.h + */ + +#define XcursorTrue 1 +#define XcursorFalse 0 + +/* + * Cursor files start with a header. The header + * contains a magic number, a version number and a + * table of contents which has type and offset information + * for the remaining tables in the file. + * + * File minor versions increment for compatible changes + * File major versions increment for incompatible changes (never, we hope) + * + * Chunks of the same type are always upward compatible. Incompatible + * changes are made with new chunk types; the old data can remain under + * the old type. Upward compatible changes can add header data as the + * header lengths are specified in the file. + * + * File: + * FileHeader + * LISTofChunk + * + * FileHeader: + * CARD32 magic magic number + * CARD32 header bytes in file header + * CARD32 version file version + * CARD32 ntoc number of toc entries + * LISTofFileToc toc table of contents + * + * FileToc: + * CARD32 type entry type + * CARD32 subtype entry subtype (size for images) + * CARD32 position absolute file position + */ + +#define XCURSOR_MAGIC 0x72756358 /* "Xcur" LSBFirst */ + +/* + * Current Xcursor version number. Will be substituted by configure + * from the version in the libXcursor configure.ac file. + */ + +#define XCURSOR_LIB_MAJOR 1 +#define XCURSOR_LIB_MINOR 1 +#define XCURSOR_LIB_REVISION 13 +#define XCURSOR_LIB_VERSION ((XCURSOR_LIB_MAJOR * 10000) + \ + (XCURSOR_LIB_MINOR * 100) + \ + (XCURSOR_LIB_REVISION)) + +/* + * This version number is stored in cursor files; changes to the + * file format require updating this version number + */ +#define XCURSOR_FILE_MAJOR 1 +#define XCURSOR_FILE_MINOR 0 +#define XCURSOR_FILE_VERSION ((XCURSOR_FILE_MAJOR << 16) | (XCURSOR_FILE_MINOR)) +#define XCURSOR_FILE_HEADER_LEN (4 * 4) +#define XCURSOR_FILE_TOC_LEN (3 * 4) + +typedef struct _XcursorFileToc { + XcursorUInt type; /* chunk type */ + XcursorUInt subtype; /* subtype (size for images) */ + XcursorUInt position; /* absolute position in file */ +} XcursorFileToc; + +typedef struct _XcursorFileHeader { + XcursorUInt magic; /* magic number */ + XcursorUInt header; /* byte length of header */ + XcursorUInt version; /* file version number */ + XcursorUInt ntoc; /* number of toc entries */ + XcursorFileToc *tocs; /* table of contents */ +} XcursorFileHeader; + +/* + * The rest of the file is a list of chunks, each tagged by type + * and version. + * + * Chunk: + * ChunkHeader + * + * + * + * ChunkHeader: + * CARD32 header bytes in chunk header + type header + * CARD32 type chunk type + * CARD32 subtype chunk subtype + * CARD32 version chunk type version + */ + +#define XCURSOR_CHUNK_HEADER_LEN (4 * 4) + +typedef struct _XcursorChunkHeader { + XcursorUInt header; /* bytes in chunk header */ + XcursorUInt type; /* chunk type */ + XcursorUInt subtype; /* chunk subtype (size for images) */ + XcursorUInt version; /* version of this type */ +} XcursorChunkHeader; + +/* + * Here's a list of the known chunk types + */ + +/* + * Comments consist of a 4-byte length field followed by + * UTF-8 encoded text + * + * Comment: + * ChunkHeader header chunk header + * CARD32 length bytes in text + * LISTofCARD8 text UTF-8 encoded text + */ + +#define XCURSOR_COMMENT_TYPE 0xfffe0001 +#define XCURSOR_COMMENT_VERSION 1 +#define XCURSOR_COMMENT_HEADER_LEN (XCURSOR_CHUNK_HEADER_LEN + (1 *4)) +#define XCURSOR_COMMENT_COPYRIGHT 1 +#define XCURSOR_COMMENT_LICENSE 2 +#define XCURSOR_COMMENT_OTHER 3 +#define XCURSOR_COMMENT_MAX_LEN 0x100000 + +typedef struct _XcursorComment { + XcursorUInt version; + XcursorUInt comment_type; + char *comment; +} XcursorComment; + +/* + * Each cursor image occupies a separate image chunk. + * The length of the image header follows the chunk header + * so that future versions can extend the header without + * breaking older applications + * + * Image: + * ChunkHeader header chunk header + * CARD32 width actual width + * CARD32 height actual height + * CARD32 xhot hot spot x + * CARD32 yhot hot spot y + * CARD32 delay animation delay + * LISTofCARD32 pixels ARGB pixels + */ + +#define XCURSOR_IMAGE_TYPE 0xfffd0002 +#define XCURSOR_IMAGE_VERSION 1 +#define XCURSOR_IMAGE_HEADER_LEN (XCURSOR_CHUNK_HEADER_LEN + (5*4)) +#define XCURSOR_IMAGE_MAX_SIZE 0x7fff /* 32767x32767 max cursor size */ + +typedef struct _XcursorFile XcursorFile; + +struct _XcursorFile { + void *closure; + int (*read) (XcursorFile *file, unsigned char *buf, int len); + int (*write) (XcursorFile *file, unsigned char *buf, int len); + int (*seek) (XcursorFile *file, long offset, int whence); +}; + +typedef struct _XcursorComments { + int ncomment; /* number of comments */ + XcursorComment **comments; /* array of XcursorComment pointers */ +} XcursorComments; + +/* + * From libXcursor/src/file.c + */ + +static XcursorImage * +XcursorImageCreate (int width, int height) +{ + XcursorImage *image; + + image = malloc (sizeof (XcursorImage) + + width * height * sizeof (XcursorPixel)); + if (!image) + return NULL; + image->version = XCURSOR_IMAGE_VERSION; + image->pixels = (XcursorPixel *) (image + 1); + image->size = width > height ? width : height; + image->width = width; + image->height = height; + image->delay = 0; + return image; +} + +static void +XcursorImageDestroy (XcursorImage *image) +{ + free (image); +} + +static XcursorImages * +XcursorImagesCreate (int size) +{ + XcursorImages *images; + + images = malloc (sizeof (XcursorImages) + + size * sizeof (XcursorImage *)); + if (!images) + return NULL; + images->nimage = 0; + images->images = (XcursorImage **) (images + 1); + images->name = NULL; + return images; +} + +void +XcursorImagesDestroy (XcursorImages *images) +{ + int n; + + if (!images) + return; + + for (n = 0; n < images->nimage; n++) + XcursorImageDestroy (images->images[n]); + if (images->name) + free (images->name); + free (images); +} + +static void +XcursorImagesSetName (XcursorImages *images, const char *name) +{ + char *new; + + if (!images || !name) + return; + + new = malloc (strlen (name) + 1); + + if (!new) + return; + + strcpy (new, name); + if (images->name) + free (images->name); + images->name = new; +} + +static XcursorBool +_XcursorReadUInt (XcursorFile *file, XcursorUInt *u) +{ + unsigned char bytes[4]; + + if (!file || !u) + return XcursorFalse; + + if ((*file->read) (file, bytes, 4) != 4) + return XcursorFalse; + *u = ((bytes[0] << 0) | + (bytes[1] << 8) | + (bytes[2] << 16) | + (bytes[3] << 24)); + return XcursorTrue; +} + +static void +_XcursorFileHeaderDestroy (XcursorFileHeader *fileHeader) +{ + free (fileHeader); +} + +static XcursorFileHeader * +_XcursorFileHeaderCreate (int ntoc) +{ + XcursorFileHeader *fileHeader; + + if (ntoc > 0x10000) + return NULL; + fileHeader = malloc (sizeof (XcursorFileHeader) + + ntoc * sizeof (XcursorFileToc)); + if (!fileHeader) + return NULL; + fileHeader->magic = XCURSOR_MAGIC; + fileHeader->header = XCURSOR_FILE_HEADER_LEN; + fileHeader->version = XCURSOR_FILE_VERSION; + fileHeader->ntoc = ntoc; + fileHeader->tocs = (XcursorFileToc *) (fileHeader + 1); + return fileHeader; +} + +static XcursorFileHeader * +_XcursorReadFileHeader (XcursorFile *file) +{ + XcursorFileHeader head, *fileHeader; + XcursorUInt skip; + unsigned int n; + + if (!file) + return NULL; + + if (!_XcursorReadUInt (file, &head.magic)) + return NULL; + if (head.magic != XCURSOR_MAGIC) + return NULL; + if (!_XcursorReadUInt (file, &head.header)) + return NULL; + if (!_XcursorReadUInt (file, &head.version)) + return NULL; + if (!_XcursorReadUInt (file, &head.ntoc)) + return NULL; + skip = head.header - XCURSOR_FILE_HEADER_LEN; + if (skip) + if ((*file->seek) (file, skip, SEEK_CUR) == EOF) + return NULL; + fileHeader = _XcursorFileHeaderCreate (head.ntoc); + if (!fileHeader) + return NULL; + fileHeader->magic = head.magic; + fileHeader->header = head.header; + fileHeader->version = head.version; + fileHeader->ntoc = head.ntoc; + for (n = 0; n < fileHeader->ntoc; n++) + { + if (!_XcursorReadUInt (file, &fileHeader->tocs[n].type)) + break; + if (!_XcursorReadUInt (file, &fileHeader->tocs[n].subtype)) + break; + if (!_XcursorReadUInt (file, &fileHeader->tocs[n].position)) + break; + } + if (n != fileHeader->ntoc) + { + _XcursorFileHeaderDestroy (fileHeader); + return NULL; + } + return fileHeader; +} + +static XcursorBool +_XcursorSeekToToc (XcursorFile *file, + XcursorFileHeader *fileHeader, + int toc) +{ + if (!file || !fileHeader || \ + (*file->seek) (file, fileHeader->tocs[toc].position, SEEK_SET) == EOF) + return XcursorFalse; + return XcursorTrue; +} + +static XcursorBool +_XcursorFileReadChunkHeader (XcursorFile *file, + XcursorFileHeader *fileHeader, + int toc, + XcursorChunkHeader *chunkHeader) +{ + if (!file || !fileHeader || !chunkHeader) + return XcursorFalse; + if (!_XcursorSeekToToc (file, fileHeader, toc)) + return XcursorFalse; + if (!_XcursorReadUInt (file, &chunkHeader->header)) + return XcursorFalse; + if (!_XcursorReadUInt (file, &chunkHeader->type)) + return XcursorFalse; + if (!_XcursorReadUInt (file, &chunkHeader->subtype)) + return XcursorFalse; + if (!_XcursorReadUInt (file, &chunkHeader->version)) + return XcursorFalse; + /* sanity check */ + if (chunkHeader->type != fileHeader->tocs[toc].type || + chunkHeader->subtype != fileHeader->tocs[toc].subtype) + return XcursorFalse; + return XcursorTrue; +} + +#define dist(a,b) ((a) > (b) ? (a) - (b) : (b) - (a)) + +static XcursorDim +_XcursorFindBestSize (XcursorFileHeader *fileHeader, + XcursorDim size, + int *nsizesp) +{ + unsigned int n; + int nsizes = 0; + XcursorDim bestSize = 0; + XcursorDim thisSize; + + if (!fileHeader || !nsizesp) + return 0; + + for (n = 0; n < fileHeader->ntoc; n++) + { + if (fileHeader->tocs[n].type != XCURSOR_IMAGE_TYPE) + continue; + thisSize = fileHeader->tocs[n].subtype; + if (!bestSize || dist (thisSize, size) < dist (bestSize, size)) + { + bestSize = thisSize; + nsizes = 1; + } + else if (thisSize == bestSize) + nsizes++; + } + *nsizesp = nsizes; + return bestSize; +} + +static int +_XcursorFindImageToc (XcursorFileHeader *fileHeader, + XcursorDim size, + int count) +{ + unsigned int toc; + XcursorDim thisSize; + + if (!fileHeader) + return 0; + + for (toc = 0; toc < fileHeader->ntoc; toc++) + { + if (fileHeader->tocs[toc].type != XCURSOR_IMAGE_TYPE) + continue; + thisSize = fileHeader->tocs[toc].subtype; + if (thisSize != size) + continue; + if (!count) + break; + count--; + } + if (toc == fileHeader->ntoc) + return -1; + return toc; +} + +static XcursorImage * +_XcursorReadImage (XcursorFile *file, + XcursorFileHeader *fileHeader, + int toc) +{ + XcursorChunkHeader chunkHeader; + XcursorImage head; + XcursorImage *image; + int n; + XcursorPixel *p; + + if (!file || !fileHeader) + return NULL; + + if (!_XcursorFileReadChunkHeader (file, fileHeader, toc, &chunkHeader)) + return NULL; + if (!_XcursorReadUInt (file, &head.width)) + return NULL; + if (!_XcursorReadUInt (file, &head.height)) + return NULL; + if (!_XcursorReadUInt (file, &head.xhot)) + return NULL; + if (!_XcursorReadUInt (file, &head.yhot)) + return NULL; + if (!_XcursorReadUInt (file, &head.delay)) + return NULL; + /* sanity check data */ + if (head.width >= 0x10000 || head.height > 0x10000) + return NULL; + if (head.width == 0 || head.height == 0) + return NULL; + if (head.xhot > head.width || head.yhot > head.height) + return NULL; + + /* Create the image and initialize it */ + image = XcursorImageCreate (head.width, head.height); + if (image == NULL) + return NULL; + if (chunkHeader.version < image->version) + image->version = chunkHeader.version; + image->size = chunkHeader.subtype; + image->xhot = head.xhot; + image->yhot = head.yhot; + image->delay = head.delay; + n = image->width * image->height; + p = image->pixels; + while (n--) + { + if (!_XcursorReadUInt (file, p)) + { + XcursorImageDestroy (image); + return NULL; + } + p++; + } + return image; +} + +static XcursorImages * +XcursorXcFileLoadImages (XcursorFile *file, int size) +{ + XcursorFileHeader *fileHeader; + XcursorDim bestSize; + int nsize; + XcursorImages *images; + int n; + int toc; + + if (!file || size < 0) + return NULL; + fileHeader = _XcursorReadFileHeader (file); + if (!fileHeader) + return NULL; + bestSize = _XcursorFindBestSize (fileHeader, (XcursorDim) size, &nsize); + if (!bestSize) + { + _XcursorFileHeaderDestroy (fileHeader); + return NULL; + } + images = XcursorImagesCreate (nsize); + if (!images) + { + _XcursorFileHeaderDestroy (fileHeader); + return NULL; + } + for (n = 0; n < nsize; n++) + { + toc = _XcursorFindImageToc (fileHeader, bestSize, n); + if (toc < 0) + break; + images->images[images->nimage] = _XcursorReadImage (file, fileHeader, + toc); + if (!images->images[images->nimage]) + break; + images->nimage++; + } + _XcursorFileHeaderDestroy (fileHeader); + if (images->nimage != nsize) + { + XcursorImagesDestroy (images); + images = NULL; + } + return images; +} + +static int +_XcursorStdioFileRead (XcursorFile *file, unsigned char *buf, int len) +{ + FILE *f = file->closure; + return fread (buf, 1, len, f); +} + +static int +_XcursorStdioFileWrite (XcursorFile *file, unsigned char *buf, int len) +{ + FILE *f = file->closure; + return fwrite (buf, 1, len, f); +} + +static int +_XcursorStdioFileSeek (XcursorFile *file, long offset, int whence) +{ + FILE *f = file->closure; + return fseek (f, offset, whence); +} + +static void +_XcursorStdioFileInitialize (FILE *stdfile, XcursorFile *file) +{ + file->closure = stdfile; + file->read = _XcursorStdioFileRead; + file->write = _XcursorStdioFileWrite; + file->seek = _XcursorStdioFileSeek; +} + +static XcursorImages * +XcursorFileLoadImages (FILE *file, int size) +{ + XcursorFile f; + + if (!file) + return NULL; + + _XcursorStdioFileInitialize (file, &f); + return XcursorXcFileLoadImages (&f, size); +} + +/* + * From libXcursor/src/library.c + */ + +#ifndef ICONDIR +#define ICONDIR "/usr/X11R6/lib/X11/icons" +#endif + +#ifndef XCURSORPATH +#define XCURSORPATH "~/.icons:/usr/share/icons:/usr/share/pixmaps:~/.cursors:/usr/share/cursors/xorg-x11:"ICONDIR +#endif + +static const char * +XcursorLibraryPath (void) +{ + static const char *path; + + if (!path) + { + path = getenv ("XCURSOR_PATH"); + if (!path) + path = XCURSORPATH; + } + return path; +} + +static void +_XcursorAddPathElt (char *path, const char *elt, int len) +{ + int pathlen = strlen (path); + + /* append / if the path doesn't currently have one */ + if (path[0] == '\0' || path[pathlen - 1] != '/') + { + strcat (path, "/"); + pathlen++; + } + if (len == -1) + len = strlen (elt); + /* strip leading slashes */ + while (len && elt[0] == '/') + { + elt++; + len--; + } + strncpy (path + pathlen, elt, len); + path[pathlen + len] = '\0'; +} + +static char * +_XcursorBuildThemeDir (const char *dir, const char *theme) +{ + const char *colon; + const char *tcolon; + char *full; + char *home; + int dirlen; + int homelen; + int themelen; + int len; + + if (!dir || !theme) + return NULL; + + colon = strchr (dir, ':'); + if (!colon) + colon = dir + strlen (dir); + + dirlen = colon - dir; + + tcolon = strchr (theme, ':'); + if (!tcolon) + tcolon = theme + strlen (theme); + + themelen = tcolon - theme; + + home = NULL; + homelen = 0; + if (*dir == '~') + { + home = getenv ("HOME"); + if (!home) + return NULL; + homelen = strlen (home); + dir++; + dirlen--; + } + + /* + * add space for any needed directory separators, one per component, + * and one for the trailing null + */ + len = 1 + homelen + 1 + dirlen + 1 + themelen + 1; + + full = malloc (len); + if (!full) + return NULL; + full[0] = '\0'; + + if (home) + _XcursorAddPathElt (full, home, -1); + _XcursorAddPathElt (full, dir, dirlen); + _XcursorAddPathElt (full, theme, themelen); + return full; +} + +static char * +_XcursorBuildFullname (const char *dir, const char *subdir, const char *file) +{ + char *full; + + if (!dir || !subdir || !file) + return NULL; + + full = malloc (strlen (dir) + 1 + strlen (subdir) + 1 + strlen (file) + 1); + if (!full) + return NULL; + full[0] = '\0'; + _XcursorAddPathElt (full, dir, -1); + _XcursorAddPathElt (full, subdir, -1); + _XcursorAddPathElt (full, file, -1); + return full; +} + +static const char * +_XcursorNextPath (const char *path) +{ + char *colon = strchr (path, ':'); + + if (!colon) + return NULL; + return colon + 1; +} + +#define XcursorWhite(c) ((c) == ' ' || (c) == '\t' || (c) == '\n') +#define XcursorSep(c) ((c) == ';' || (c) == ',') + +static char * +_XcursorThemeInherits (const char *full) +{ + char line[8192]; + char *result = NULL; + FILE *f; + + if (!full) + return NULL; + + f = fopen (full, "r"); + if (f) + { + while (fgets (line, sizeof (line), f)) + { + if (!strncmp (line, "Inherits", 8)) + { + char *l = line + 8; + char *r; + while (*l == ' ') l++; + if (*l != '=') continue; + l++; + while (*l == ' ') l++; + result = malloc (strlen (l) + 1); + if (result) + { + r = result; + while (*l) + { + while (XcursorSep(*l) || XcursorWhite (*l)) l++; + if (!*l) + break; + if (r != result) + *r++ = ':'; + while (*l && !XcursorWhite(*l) && + !XcursorSep(*l)) + *r++ = *l++; + } + *r++ = '\0'; + } + break; + } + } + fclose (f); + } + return result; +} + +static FILE * +XcursorScanTheme (const char *theme, const char *name) +{ + FILE *f = NULL; + char *full; + char *dir; + const char *path; + char *inherits = NULL; + const char *i; + + if (!theme || !name) + return NULL; + + /* + * Scan this theme + */ + for (path = XcursorLibraryPath (); + path && f == NULL; + path = _XcursorNextPath (path)) + { + dir = _XcursorBuildThemeDir (path, theme); + if (dir) + { + full = _XcursorBuildFullname (dir, "cursors", name); + if (full) + { + f = fopen (full, "r"); + free (full); + } + if (!f && !inherits) + { + full = _XcursorBuildFullname (dir, "", "index.theme"); + if (full) + { + inherits = _XcursorThemeInherits (full); + free (full); + } + } + free (dir); + } + } + /* + * Recurse to scan inherited themes + */ + for (i = inherits; i && f == NULL; i = _XcursorNextPath (i)) + f = XcursorScanTheme (i, name); + if (inherits != NULL) + free (inherits); + return f; +} + +XcursorImages * +XcursorLibraryLoadImages (const char *file, const char *theme, int size) +{ + FILE *f = NULL; + XcursorImages *images = NULL; + + if (!file) + return NULL; + + if (theme) + f = XcursorScanTheme (theme, file); + if (!f) + f = XcursorScanTheme ("default", file); + if (f) + { + images = XcursorFileLoadImages (f, size); + if (images) + XcursorImagesSetName (images, file); + fclose (f); + } + return images; +} + +static void +load_all_cursors_from_dir(const char *path, int size, + void (*load_callback)(XcursorImages *, void *), + void *user_data) +{ + FILE *f; + DIR *dir = opendir(path); + struct dirent *ent; + char *full; + XcursorImages *images; + + if (!dir) + return; + + for(ent = readdir(dir); ent; ent = readdir(dir)) { + if (ent->d_type != DT_UNKNOWN && + (ent->d_type != DT_REG && ent->d_type != DT_LNK)) + continue; + + full = _XcursorBuildFullname(path, "", ent->d_name); + if (!full) + continue; + + f = fopen(full, "r"); + if (!f) { + free(full); + continue; + } + + images = XcursorFileLoadImages(f, size); + + if (images) { + XcursorImagesSetName(images, ent->d_name); + load_callback(images, user_data); + } + + fclose (f); + free(full); + } + + closedir(dir); +} + +/** Load all the cursor of a theme + * + * This function loads all the cursor images of a given theme and its + * inherited themes. Each cursor is loaded into an XcursorImages object + * which is passed to the caller's load callback. If a cursor appears + * more than once across all the inherited themes, the load callback + * will be called multiple times, with possibly different XcursorImages + * object which have the same name. The user is expected to destroy the + * XcursorImages objects passed to the callback with + * XcursorImagesDestroy(). + * + * \param theme The name of theme that should be loaded + * \param size The desired size of the cursor images + * \param load_callback A callback function that will be called + * for each cursor loaded. The first parameter is the XcursorImages + * object representing the loaded cursor and the second is a pointer + * to data provided by the user. + * \param user_data The data that should be passed to the load callback + */ +void +xcursor_load_theme(const char *theme, int size, + void (*load_callback)(XcursorImages *, void *), + void *user_data) +{ + char *full, *dir; + char *inherits = NULL; + const char *path, *i; + + if (!theme) + theme = "default"; + + for (path = XcursorLibraryPath(); + path; + path = _XcursorNextPath(path)) { + dir = _XcursorBuildThemeDir(path, theme); + if (!dir) + continue; + + full = _XcursorBuildFullname(dir, "cursors", ""); + + if (full) { + load_all_cursors_from_dir(full, size, load_callback, + user_data); + free(full); + } + + if (!inherits) { + full = _XcursorBuildFullname(dir, "", "index.theme"); + if (full) { + inherits = _XcursorThemeInherits(full); + free(full); + } + } + + free(dir); + } + + for (i = inherits; i; i = _XcursorNextPath(i)) + xcursor_load_theme(i, size, load_callback, user_data); + + if (inherits) + free(inherits); +} -- cgit v1.2.3