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* add support of CMYK, ICCK and grayscale images 

* remove trailing spaces

fix ticket #303


SVN revision: 40515
This commit is contained in:
Vincent Torri 2009-05-05 21:48:50 +00:00
parent f73ad689da
commit 48c7e28b20
1 changed files with 90 additions and 15 deletions
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81
legacy/evas/src/modules/loaders/jpeg/evas_image_load_jpeg.c
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@ -1,4 +1,3 @@
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
@ -219,6 +218,24 @@ evas_image_load_file_data_jpeg_internal(Image_Entry *ie, FILE *f)
cinfo.scale_denom = ie->scale;
}
/* Colorspace conversion options */
/* libjpeg can do the following conversions: */
/* GRAYSCLAE => RGB YCbCr => RGB and YCCK => CMYK */
switch (cinfo.jpeg_color_space)
{
case JCS_UNKNOWN:
break;
case JCS_GRAYSCALE:
case JCS_RGB:
case JCS_YCbCr:
cinfo.out_color_space = JCS_RGB;
break;
case JCS_CMYK:
case JCS_YCCK:
cinfo.out_color_space = JCS_CMYK;
break;
}
/* head decoding */
jpeg_calc_output_dimensions(&(cinfo));
jpeg_start_decompress(&cinfo);
@ -232,6 +249,14 @@ evas_image_load_file_data_jpeg_internal(Image_Entry *ie, FILE *f)
return 0;
}
if (!(((cinfo.out_color_space == JCS_RGB) &&
((cinfo.output_components == 3) || (cinfo.output_components == 1))) ||
(cinfo.out_color_space == JCS_CMYK) && (cinfo.output_components == 4)))
{
jpeg_destroy_decompress(&cinfo);
return 0;
}
/* end head decoding */
/* data decoding */
if (cinfo.rec_outbuf_height > 16)
@ -239,7 +264,7 @@ evas_image_load_file_data_jpeg_internal(Image_Entry *ie, FILE *f)
jpeg_destroy_decompress(&cinfo);
return 0;
}
data = alloca(w * 16 * 3);
data = alloca(w * 16 * cinfo.output_components);
evas_cache_image_surface_alloc(ie, w, h);
if (ie->flags.loaded)
{
@ -249,7 +274,56 @@ evas_image_load_file_data_jpeg_internal(Image_Entry *ie, FILE *f)
ptr2 = evas_cache_image_pixels(ie);
count = 0;
prevy = 0;
if (cinfo.output_components == 3)
/* We handle first CMYK (4 components) */
if (cinfo.output_components == 4)
{
for (i = 0; i < cinfo.rec_outbuf_height; i++)
line[i] = data + (i * w * 4);
for (l = 0; l < h; l += cinfo.rec_outbuf_height)
{
jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height);
scans = cinfo.rec_outbuf_height;
if ((h - l) < scans) scans = h - l;
ptr = data;
for (y = 0; y < scans; y++)
{
for (x = 0; x < w; x++)
{
if (cinfo.saw_Adobe_marker)
/* According to libjpeg doc, Photoshop inverse the values of C, M, Y and K, */
/* that is C is replaces by 255 - C, etc...*/
/* See the comment below for the computation of RGB values from CMYK ones. */
*ptr2 =
(0xff000000) |
((ptr[0] * ptr[3] / 255) << 16) |
((ptr[1] * ptr[3] / 255) << 8) |
((ptr[2] * ptr[3] / 255));
else
/* Conversion from CMYK to RGB is done in 2 steps: */
/* CMYK => CMY => RGB (see http://www.easyrgb.com/index.php?X=MATH) */
/* after computation, if C, M, Y and K are between 0 and 1, we have: */
/* R = (1 - C) * (1 - K) * 255 */
/* G = (1 - M) * (1 - K) * 255 */
/* B = (1 - Y) * (1 - K) * 255 */
/* libjpeg stores CMYK values between 0 and 255, */
/* so we replace C by C * 255 / 255, etc... and we obtain: */
/* R = (255 - C) * (255 - K) / 255 */
/* G = (255 - M) * (255 - K) / 255 */
/* B = (255 - Y) * (255 - K) / 255 */
/* with C, M, Y and K between 0 and 255. */
*ptr2 =
(0xff000000) |
(((255 - ptr[0]) * (255 - ptr[3]) / 255) << 16) |
(((255 - ptr[1]) * (255 - ptr[3]) / 255) << 8) |
(((255 - ptr[2]) * (255 - ptr[3]) / 255));
ptr += 4;
ptr2++;
}
}
}
}
/* We handle then RGB with 3 components */
else if (cinfo.output_components == 3)
{
for (i = 0; i < cinfo.rec_outbuf_height; i++)
line[i] = data + (i * w * 3);
@ -271,6 +345,7 @@ evas_image_load_file_data_jpeg_internal(Image_Entry *ie, FILE *f)
}
}
}
/* We finally handle RGB with 1 component */
else if (cinfo.output_components == 1)
{
for (i = 0; i < cinfo.rec_outbuf_height; i++)