+
+/*
+ JDIMENSION image_width; // input image width
+ JDIMENSION image_height; // input image height
+ int output_components; // # of color components returned
+ J_COLOR_SPACE in_color_space; // colorspace of input image
+ double input_gamma; // image gamma of input image
+ int data_precision; // bits of precision in image data
+
+*/
+
+ /* Step 4: set parameters for decompression */
+
+ if (DEBUG) printf("Entree Step 4\n");
+
+ /* In this example, we don't need to change any of the defaults set by
+ * jpeg_read_header(), so we do nothing here.
+ */
+
+ /* Step 5: Start decompressor */
+
+ if (DEBUG) printf("Entree Step 5\n");
+
+ (void) jpeg_start_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* We may need to do some setup of our own at this point before reading
+ * the data. After jpeg_start_decompress() we have the correct scaled
+ * output image dimensions available, as well as the output colormap
+ * if we asked for color quantization.
+ * In this example, we need to make an output work buffer of the right size.
+ */
+
+ /* JSAMPLEs per row in output buffer */
+ row_stride = cinfo.output_width * cinfo.output_components;
+
+ if (DEBUG) printf ("cinfo.output_width %d cinfo.output_components %d row_stride %d\n",
+ cinfo.output_width, cinfo.output_components,row_stride);
+
+ /* Make a one-row-high sample array that will go away when done with image */
+ buffer = (*cinfo.mem->alloc_sarray)
+ ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+
+ /* Step 6: while (scan lines remain to be read) */
+
+ if (DEBUG) printf("Entree Step 6\n");
+
+ /* jpeg_read_scanlines(...); */
+
+ /* Here we use the library's state variable cinfo.output_scanline as the
+ * loop counter, so that we don't have to keep track ourselves.
+ */
+
+ if (DEBUG) printf ("cinfo.output_height %d cinfo.output_width %d\n",
+ cinfo.output_height,cinfo.output_width);
+
+ pimage=(char *)image_buffer;
+
+
+ while (cinfo.output_scanline < cinfo.output_height) {
+ /* jpeg_read_scanlines expects an array of pointers to scanlines.
+ * Here the array is only one element long, but you could ask for
+ * more than one scanline at a time if that's more convenient.
+ */
+
+ // l'image est deja allouée (et passée en param)
+ // on ecrit directement les pixels
+ // (on DEVRAIT pouvoir)
+
+ //(void) jpeg_read_scanlines(&cinfo, pimage, 1);
+
+ (void) jpeg_read_scanlines(&cinfo, buffer, 1);
+
+ if ( BITS_IN_JSAMPLE == 8) {
+ memcpy( pimage, buffer[0],row_stride);
+ pimage+=row_stride;
+ } else {
+ memcpy( pimage, buffer[0],row_stride*2 ); // FIXME : *2 car 16 bits?!?
+ pimage+=row_stride*2; // FIXME : *2 car 16 bits?!?
+ }
+ }
+
+ /* Step 7: Finish decompression */
+
+if (DEBUG) printf("Entree Step 7\n");
+
+ (void) jpeg_finish_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* Step 8: Release JPEG decompression object */
+
+if (DEBUG) printf("Entree Step 8\n");
+
+ /* This is an important step since it will release a good deal of memory. */
+
+ jpeg_destroy_decompress(&cinfo);
+
+ /* After finish_decompress, we can close the input file.
+ * Here we postpone it until after no more JPEG errors are possible,
+ * so as to simplify the setjmp error logic above. (Actually, I don't
+ * think that jpeg_destroy can do an error exit, but why assume anything...)
+ */
+
+ /* At this point you may want to check to see whether any corrupt-data
+ * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
+ */
+
+ /* And we're done! */
+
+ return 1;