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[STR New]
Link: http://www.fltk.org/str.php?L2633
Version: 1.3-feature
Here is a patch to fltk 1.3 that add a static method for Fl_JPEG_Image and
Fl_PNG_Image to encode from Fl_Image to JPEG and PNG format on memory.
Link: http://www.fltk.org/str.php?L2633
Version: 1.3-feature
Index: FL/Fl_JPEG_Image.H
===================================================================
--- FL/Fl_JPEG_Image.H (revision 8640)
+++ FL/Fl_JPEG_Image.H (working copy)
@@ -44,6 +44,7 @@
Fl_JPEG_Image(const char *filename);
Fl_JPEG_Image(const char *name, const unsigned char *data);
+ static int encode(Fl_Image *img, int quality, unsigned char **outbuffer, int
&outlen);
};
#endif
Index: FL/Fl_PNG_Image.H
===================================================================
--- FL/Fl_PNG_Image.H (revision 8640)
+++ FL/Fl_PNG_Image.H (working copy)
@@ -44,6 +44,7 @@
Fl_PNG_Image(const char* filename);
Fl_PNG_Image (const char *name_png, const unsigned char *buffer, int
datasize);
+ static int encode(Fl_Image *img, unsigned char **outbuffer, int &outlen);
private:
void load_png_(const char *name_png, const unsigned char *buffer_png, int
datasize);
};
Index: src/Fl_JPEG_Image.cxx
===================================================================
--- src/Fl_JPEG_Image.cxx (revision 8640)
+++ src/Fl_JPEG_Image.cxx (working copy)
@@ -376,6 +376,62 @@
#endif // HAVE_LIBJPEG
}
+int Fl_JPEG_Image::encode(Fl_Image *img, int quality,
+ unsigned char **outbuffer, int &outlen){
+#ifdef HAVE_LIBJPEG
+ int imgw = img->w(), imgh = img->h(), imgd = img->d();
+ outlen = imgw * imgh * imgd;
+
+ struct jpeg_compress_struct cinfo = {0};
+ struct jpeg_error_mgr jerr;
+
+ if (imgd == 3) cinfo.in_color_space = JCS_RGB;
+ else if (imgd == 1) cinfo.in_color_space = JCS_GRAYSCALE;
+ else return -1;
+
+
+ *outbuffer = NULL;
+ unsigned long sz_outlen = 0;
+
+ /* create our in-memory output buffer to hold the jpeg */
+ *outbuffer = (unsigned char *) malloc(outlen+8*1024); //safe margin
+
+ cinfo.err = jpeg_std_error(&jerr);
+ jpeg_create_compress(&cinfo);
+ jpeg_mem_dest(&cinfo, outbuffer, &sz_outlen);
+
+ cinfo.image_width = imgw;
+ cinfo.image_height = imgh;
+ cinfo.input_components = imgd;
+
+ jpeg_set_defaults(&cinfo);
+ jpeg_set_quality (&cinfo, quality, true);
+ jpeg_start_compress(&cinfo, true);
+
+ uchar * row_pointer;
+ uchar *idata = (uchar *)img->data()[0];
+
+ /* main code to write jpeg data */
+ int iwd = imgw * imgd;
+ while (cinfo.next_scanline < cinfo.image_height) {
+ row_pointer = idata + cinfo.next_scanline * iwd;
+ (void) jpeg_write_scanlines(&cinfo, &row_pointer, 1);
+ }
+ jpeg_finish_compress(&cinfo);
+ jpeg_destroy_compress(&cinfo);
+ outlen = sz_outlen;
+
+// FILE* outfile = fopen("test.jpeg", "wb");
+// if (outfile){
+// fwrite(*outbuffer, outlen,1 ,outfile);
+// fclose(outfile);
+// }
+ return 0;
+#else
+ return -1;
+#endif // HAVE_LIBJPEG
+}
+
//
// End of "$Id$".
//
Index: src/Fl_PNG_Image.cxx
===================================================================
--- src/Fl_PNG_Image.cxx (revision 8640)
+++ src/Fl_PNG_Image.cxx (working copy)
@@ -218,7 +218,115 @@
#endif // HAVE_LIBPNG && HAVE_LIBZ
}
+#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
+/* structure to store PNG image bytes */
+typedef struct {
+ uchar *buffer;
+ size_t size;
+ size_t size_allocated;
+} mem_encode;
+
+void my_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length){
+ mem_encode* p=(mem_encode*)png_get_io_ptr(png_ptr);
+ size_t nsize = p->size + length;
+
+ /* allocate or grow buffer */
+ if(nsize > p->size_allocated){
+ int alloc_size = nsize * 2;
+ if(p->buffer)
+ p->buffer = (uchar*)realloc(p->buffer, alloc_size);
+ else
+ p->buffer = (uchar*)malloc(alloc_size);
+
+ if(!p->buffer) {
+ png_error(png_ptr, "Write Error");
+ return;
+ }
+ p->size_allocated = alloc_size;
+ }
+
+ /* copy new bytes to end of buffer */
+ memcpy(p->buffer + p->size, data, length);
+ p->size += length;
+}
+
+/* This is optional but included to show how png_set_write_fn() is called */
+void my_png_flush(png_structp png_ptr){}
+#endif // HAVE_LIBPNG && HAVE_LIBZ
+
+int Fl_PNG_Image::encode(Fl_Image *img, unsigned char **outbuffer, int
&outlen){
+#if defined(HAVE_LIBPNG) && defined(HAVE_LIBZ)
+ int imgw = img->w(), imgh = img->h(), imgd = img->d();
+ outlen = imgw * imgh * imgd;
+
+ png_structp pp; // PNG data
+ png_infop info; // PNG image info
+ mem_encode state;
+ /* initialise - put this before png_write_png() call */
+ state.buffer = NULL;
+ state.size = 0;
+ state.size_allocated = 0;
+
+
+ if( !((imgd == 1) || (imgd ==3) || (imgd ==4))) return -1;
+ pp = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+ if(!pp) return -1;
+
+ info = png_create_info_struct(pp);
+ if (!info){
+ png_destroy_write_struct(&pp, 0);
+ return -1;
+ }
+
+ if (setjmp(png_jmpbuf(pp))){
+ png_destroy_write_struct(&pp, &info);
+ return -1;
+ }
+
+ //png_init_io(pp, fp);
+ /* if my_png_flush() is not needed, change the arg to NULL */
+ png_set_write_fn(pp, &state, my_png_write_data, my_png_flush);
+
+
+ png_set_compression_level(pp, Z_BEST_COMPRESSION);
+ png_set_IHDR(pp, info, imgw, imgh, 8,
+ imgd == 1 ? PNG_COLOR_TYPE_GRAY : PNG_COLOR_TYPE_RGB,
+ PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+ PNG_FILTER_TYPE_DEFAULT);
+ png_set_sRGB(pp, info, PNG_sRGB_INTENT_PERCEPTUAL);
+ png_set_sRGB_gAMA_and_cHRM(pp, info, PNG_INFO_sRGB);
+
+ png_write_info(pp, info);
+
+ uchar *idata = (uchar *)img->data()[0];
+ int iwd = imgw * imgd;
+
+ for (int y = 0; y < imgh; y++)
+ {
+ png_write_row(pp, (png_byte *)(idata + y * iwd));
+ }
+
+ png_write_end(pp, info);
+ png_destroy_write_struct(&pp, 0);
+
+ /* cleanup */
+ //if(state.buffer) free(state.buffer);
+
+ *outbuffer = state.buffer;
+ outlen = state.size;
+
+// FILE* outfile = fopen("test.png", "wb");
+// if (outfile){
+// fwrite(*outbuffer, outlen,1 ,outfile);
+// fclose(outfile);
+// }
+ return 0;
+#else
+ return -1;
+#endif // HAVEHAVE_LIBPNG && HAVE_LIBZ
+}
+
//
// End of "$Id$".
//
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