2 * Image Library -- GraphicsMagick (slow fallback library)
4 * (c) 2006 Pavel Charvat <pchar@ucw.cz>
6 * This software may be freely distributed and used according to the terms
7 * of the GNU Lesser General Public License.
13 #include "lib/mempool.h"
14 #include "lib/fastbuf.h"
15 #include "images/images.h"
16 #include <sys/types.h>
19 #include <magick/api.h>
21 #define MAX_FILE_SIZE (1 << 30)
22 #define QUANTUM_SCALE (QuantumDepth - 8)
23 #define QUANTUM_TO_BYTE(x) ((uns)(x) >> QUANTUM_SCALE)
24 #define BYTE_TO_QUANTUM(x) ((uns)(x) << QUANTUM_SCALE)
25 #define OPACITY_MAX ((1 << QuantumDepth) - 1)
27 struct magick_read_data {
28 ExceptionInfo exception;
34 libmagick_destroy_read_data(struct magick_read_data *rd)
37 DestroyImage(rd->image);
38 DestroyImageInfo(rd->info);
39 DestroyExceptionInfo(&rd->exception);
44 libmagick_read_cancel(struct image_io *io)
46 DBG("libmagick_read_cancel()");
48 struct magick_read_data *rd = io->read_data;
50 DestroyImage(rd->image);
51 libmagick_destroy_read_data(rd);
55 libmagick_read_header(struct image_io *io)
57 DBG("libmagick_read_header()");
59 /* Read entire stream */
60 sh_off_t file_size = bfilesize(io->fastbuf) - btell(io->fastbuf);
61 if (unlikely(file_size > MAX_FILE_SIZE))
63 image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Too long stream.");
66 uns buf_size = file_size;
67 byte *buf = xmalloc(buf_size);
68 bread(io->fastbuf, buf, buf_size);
70 /* Allocate read structure */
71 struct magick_read_data *rd = io->read_data = mp_alloc(io->internal_pool, sizeof(*rd));
73 /* Initialize GraphicsMagick */
74 InitializeMagick(NULL);
75 GetExceptionInfo(&rd->exception);
76 rd->info = CloneImageInfo(NULL);
77 rd->info->subrange = 1;
80 rd->image = BlobToImage(rd->info, buf, buf_size, &rd->exception);
82 if (unlikely(!rd->image))
84 image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "GraphicsMagick failed to read the image.");
87 if (unlikely(rd->image->columns > IMAGE_MAX_SIZE || rd->image->rows > IMAGE_MAX_SIZE))
89 image_thread_err(io->thread, IMAGE_ERR_INVALID_DIMENSIONS, "Image too large.");
93 /* Fill image parameters */
95 io->cols = rd->image->columns;
97 io->rows = rd->image->rows;
98 if (!(io->flags & IMAGE_CHANNELS_FORMAT))
100 switch (rd->image->colorspace)
103 io->flags |= COLOR_SPACE_GRAYSCALE | IMAGE_ALPHA;
106 io->flags |= COLOR_SPACE_RGB | IMAGE_ALPHA;
111 io->read_cancel = libmagick_read_cancel;
115 libmagick_destroy_read_data(rd);
120 libmagick_pixel_to_gray(PixelPacket *pixel)
122 return ((uns)pixel->red * 19660 + (uns)pixel->green * 38666 + (uns)pixel->blue * 7210) >> (16 + QUANTUM_SCALE);
126 libmagick_read_data(struct image_io *io)
128 DBG("libmagick_read_data()");
130 struct magick_read_data *rd = io->read_data;
133 switch (rd->image->colorspace)
139 QuantizeInfo quantize;
140 GetQuantizeInfo(&quantize);
141 quantize.colorspace = RGBColorspace;
142 QuantizeImage(&quantize, rd->image);
146 /* Allocate image for conversion */
147 int need_scale = io->cols != rd->image->columns || io->rows != rd->image->rows;
148 int need_destroy = need_scale || !io->pool;
149 struct image *img = need_scale ?
150 image_new(io->thread, rd->image->columns, rd->image->rows, io->flags & IMAGE_CHANNELS_FORMAT, NULL) :
151 image_new(io->thread, io->cols, io->rows, io->flags, io->pool);
156 PixelPacket *src = (PixelPacket *)AcquireImagePixels(rd->image, 0, 0, rd->image->columns, rd->image->rows, &rd->exception);
159 image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Cannot acquire image pixels.");
164 switch (img->pixel_size)
167 # define IMAGE_WALK_INLINE
168 # define IMAGE_WALK_UNROLL 4
169 # define IMAGE_WALK_COL_STEP 1
170 # define IMAGE_WALK_DO_STEP do{ \
171 pos[0] = libmagick_pixel_to_gray(src); \
173 # include "images/image-walk.h"
177 # define IMAGE_WALK_INLINE
178 # define IMAGE_WALK_UNROLL 4
179 # define IMAGE_WALK_COL_STEP 2
180 # define IMAGE_WALK_DO_STEP do{ \
181 pos[0] = libmagick_pixel_to_gray(src); \
182 pos[1] = QUANTUM_TO_BYTE(src->opacity); \
184 # include "images/image-walk.h"
188 # define IMAGE_WALK_INLINE
189 # define IMAGE_WALK_UNROLL 4
190 # define IMAGE_WALK_COL_STEP 3
191 # define IMAGE_WALK_DO_STEP do{ \
192 pos[0] = QUANTUM_TO_BYTE(src->red); \
193 pos[1] = QUANTUM_TO_BYTE(src->green); \
194 pos[2] = QUANTUM_TO_BYTE(src->blue); \
196 # include "images/image-walk.h"
200 # define IMAGE_WALK_INLINE
201 # define IMAGE_WALK_UNROLL 4
202 # define IMAGE_WALK_COL_STEP 4
203 # define IMAGE_WALK_DO_STEP do{ \
204 pos[0] = QUANTUM_TO_BYTE(src->red); \
205 pos[1] = QUANTUM_TO_BYTE(src->green); \
206 pos[2] = QUANTUM_TO_BYTE(src->blue); \
207 pos[3] = QUANTUM_TO_BYTE(src->opacity); \
209 # include "images/image-walk.h"
216 /* Free GraphicsMagick structures */
217 libmagick_destroy_read_data(rd);
222 struct image *img2 = image_new(io->thread, io->cols, io->rows, io->flags, io->pool);
225 int result = image_scale(io->thread, img2, img);
226 image_destroy(io->thread, img);
228 need_destroy = !io->pool;
229 if (unlikely(!result))
235 io->image_destroy = need_destroy;
238 /* Free structures */
240 libmagick_destroy_read_data(rd);
243 image_destroy(io->thread, img);
248 libmagick_write(struct image_io *io)
250 DBG("libmagick_write()");
252 /* Initialize GraphicsMagick */
254 ExceptionInfo exception;
256 InitializeMagick(NULL);
257 GetExceptionInfo(&exception);
258 info = CloneImageInfo(NULL);
260 /* Setup image parameters and allocate the image*/
261 switch (io->flags & IMAGE_COLOR_SPACE)
263 case COLOR_SPACE_GRAYSCALE:
264 info->colorspace = GRAYColorspace;
266 case COLOR_SPACE_RGB:
267 info->colorspace = RGBColorspace;
274 case IMAGE_FORMAT_JPEG:
275 strcpy(info->magick, "JPEG");
277 case IMAGE_FORMAT_PNG:
278 strcpy(info->magick, "PNG");
280 case IMAGE_FORMAT_GIF:
281 strcpy(info->magick, "GIF");
286 Image *image = AllocateImage(info);
287 if (unlikely(!image))
289 image_thread_err(io->thread, IMAGE_ERR_WRITE_FAILED, "GraphicsMagick failed to allocate the image.");
292 image->columns = io->cols;
293 image->rows = io->rows;
296 PixelPacket *pixels = SetImagePixels(image, 0, 0, io->cols, io->rows), *dest = pixels;
297 if (unlikely(!pixels))
299 image_thread_err(io->thread, IMAGE_ERR_WRITE_FAILED, "Cannot get GraphicsMagick pixels.");
304 struct image *img = io->image;
305 switch (img->pixel_size)
308 # define IMAGE_WALK_INLINE
309 # define IMAGE_WALK_UNROLL 4
310 # define IMAGE_WALK_COL_STEP 1
311 # define IMAGE_WALK_DO_STEP do{ \
312 dest->red = BYTE_TO_QUANTUM(pos[0]); \
313 dest->green = BYTE_TO_QUANTUM(pos[0]); \
314 dest->blue = BYTE_TO_QUANTUM(pos[0]); \
315 dest->opacity = OPACITY_MAX; \
317 # include "images/image-walk.h"
320 # define IMAGE_WALK_INLINE
321 # define IMAGE_WALK_UNROLL 4
322 # define IMAGE_WALK_COL_STEP 2
323 # define IMAGE_WALK_DO_STEP do{ \
324 dest->red = BYTE_TO_QUANTUM(pos[0]); \
325 dest->green = BYTE_TO_QUANTUM(pos[0]); \
326 dest->blue = BYTE_TO_QUANTUM(pos[0]); \
327 dest->opacity = BYTE_TO_QUANTUM(pos[1]); \
329 # include "images/image-walk.h"
332 # define IMAGE_WALK_INLINE
333 # define IMAGE_WALK_UNROLL 4
334 # define IMAGE_WALK_COL_STEP 3
335 # define IMAGE_WALK_DO_STEP do{ \
336 dest->red = BYTE_TO_QUANTUM(pos[0]); \
337 dest->green = BYTE_TO_QUANTUM(pos[1]); \
338 dest->blue = BYTE_TO_QUANTUM(pos[2]); \
339 dest->opacity = OPACITY_MAX; \
341 # include "images/image-walk.h"
344 # define IMAGE_WALK_INLINE
345 # define IMAGE_WALK_UNROLL 4
346 # define IMAGE_WALK_COL_STEP 4
347 # define IMAGE_WALK_DO_STEP do{ \
348 dest->red = BYTE_TO_QUANTUM(pos[0]); \
349 dest->green = BYTE_TO_QUANTUM(pos[1]); \
350 dest->blue = BYTE_TO_QUANTUM(pos[2]); \
351 dest->opacity = BYTE_TO_QUANTUM(pos[3]); \
353 # include "images/image-walk.h"
358 if (unlikely(!SyncImagePixels(image)))
360 image_thread_err(io->thread, IMAGE_ERR_WRITE_FAILED, "Cannot sync GraphicsMagick pixels.");
366 void *buf = ImageToBlob(info, image, &buf_len, &exception);
369 image_thread_err(io->thread, IMAGE_ERR_WRITE_FAILED, "GraphicsMagick failed to compress the image.");
372 if (unlikely(buf_len > MAX_FILE_SIZE))
374 image_thread_err(io->thread, IMAGE_ERR_WRITE_FAILED, "Image too large.");
378 /* Write to stream */
379 bwrite(io->fastbuf, buf, buf_len);
387 DestroyImageInfo(info);
388 DestroyExceptionInfo(&exception);