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minime.c
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minime.c
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// ============================================================================
// C servlet sample for the G-WAN Web Application Server (http://trustleap.ch/)
// ----------------------------------------------------------------------------
// cairo.c: generates a PNG bitmap with the "Hello World" string rendered with
// the selected font and RGB 24-bit color.
// ----------------------------------------------------------------------------
// Cairo is a 2D graphics library with support for multiple output devices:
//
// - the X Window System (via both Xlib and XCB),
// - Quartz,
// - Win32,
// - image buffers,
// - PostScript,
// - PDF,
// - OpenGL,
// - SVG file output.
//
// Cairo support stroking and filling cubic Bézier splines, transforming and
// compositing translucent images, and antialiased text rendering. All drawing
// operations can be transformed by any affine transformation (scale, rotation,
// shear, etc.). More on http://cairographics.org/
//
// Examples of use:
//
// - GNUplot and PLplot are 2D and 3D graph plotting utility using Cairo,
// - Firefox 3.0 uses cairo for rendering all content and UI,
// - The GTK+ widget toolkit version 2.8+ relies on Cairo.
//
// Installation: sudo apt-get install libcairo2 libcairo2-dev
// ----------------------------------------------------------------------------
#pragma link "cairo"
#pragma include "/usr/include/cairo"
#include "cairo.h"
#include "gwan.h"
#include <stdio.h>
#include <stdlib.h>
static cairo_status_t
write_png_stream_to_buffer (void *in_closure, const unsigned char *data,
unsigned int length)
{
xbuf_ncat(in_closure, (char*) data, length);
return CAIRO_STATUS_SUCCESS;
}
// ----------------------------------------------------------------------------
int main(int argc, char **argv)
{
xbuf_t *reply = get_reply(argv);
// -------------------------------------------------------------------------
// get the URI parameter
// -------------------------------------------------------------------------
char *file = ""; get_arg("file=", &file, argc, argv);
if(!file || !*file)
{
//xbuf_cat(reply, "<p>usage: http://127.0.0.1:8080/?minime.c&file=index.html</p>");
printf ("No filename given");
return 400;
}
// -------------------------------------------------------------------------
// build the local file name
// -------------------------------------------------------------------------
char *wwwpath = (char*)get_env(argv, WWW_ROOT);
char filename[512] = {0};
snprintf(filename, sizeof(filename), "%s/%s", wwwpath, file);
u32 i = 1;
for(; i < argc; i++) // just in case we have subdirectories
{
strcat(filename, "/");
strcat(filename, argv[i]);
}
// -------------------------------------------------------------------------
// try to load the file
// -------------------------------------------------------------------------
//printf("loading '%s' file...\n", filename);
//xbuf_t f; xbuf_init(&f);
//xbuf_frfile(&f, filename);
//printf("loaded %d bytes\n", f.len);
//if(!f.len) return 200;
// -------------------------------------------------------------------------
// build the bitmap using Cairo
// -------------------------------------------------------------------------
//int stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, 640);
//cairo_surface_t *surface_source = cairo_image_surface_create_for_data((unsigned char *)f.ptr, CAIRO_FORMAT_ARGB32, 640, 480, stride);
cairo_surface_t *surface_source = cairo_image_surface_create_from_png(filename);
cairo_t *cr_source = cairo_create (surface_source);
//cairo_select_font_face(cr_source, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
//cairo_set_font_size (cr_source, 32.0);
//cairo_set_source_rgb (cr_source, 0.0, 0.0, 1.0);
//cairo_move_to (cr_source, 10.0, 50.0);
//cairo_show_text (cr_source, "Hello, world");
const double factor = 0.5;
int source_w = cairo_image_surface_get_width (surface_source);
int source_h = cairo_image_surface_get_height (surface_source);
printf("%f", source_w * factor);
cairo_surface_t *surface_dest = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, source_w * factor, source_h * factor);
cairo_t *cr_dest = cairo_create (surface_dest);
cairo_scale(cr_dest, factor, factor);
cairo_set_source_surface(cr_dest, surface_source, 0, 0);
cairo_paint(cr_dest);
cairo_destroy (cr_source);
cairo_destroy (cr_dest);
// -------------------------------------------------------------------------
// allocate memory for a raw bitmap
// -------------------------------------------------------------------------
//int w = 800, h = 800, nbcolors = 256, wXh = w * h;
//u8 *bmp = (u8*)malloc(wXh);
//if(!bmp) return 503; // service unavailable
// -------------------------------------------------------------------------
// specify a MIME type so we don't have to build custom HTTP headers
// -------------------------------------------------------------------------
char *mime = (char*)get_env(argv, REPLY_MIME_TYPE);
// note that we setup the FILE EXTENTION, not the MIME type:
mime[0] = '.'; mime[1] = 'p'; mime[2] = 'n'; mime[3] = 'g'; mime[4] = 0;
// -------------------------------------------------------------------------
// make sure that we have enough space in the 'reply' buffer
// (we are going to fill it directly from gif_build(), not via xbuf_xxx)
// -------------------------------------------------------------------------
// (if we have not enough memory, we will get a 'graceful' crash)
//if(reply->allocated < (wXh / 10)) // very gross approximation
//{
// if(!xbuf_growto(reply, wXh / 10)) // resize reply
// {
// xbuf_init(reply);
// xbuf_ncat(reply, " ", 1);
// reply->len = 0; // discart pointless data, keep allocated memory
// return 503; // error: we could not allocate enough memory
// }
//}
int rc;
rc = cairo_surface_write_to_png_stream (surface_dest, write_png_stream_to_buffer, reply);
cairo_surface_destroy(surface_dest);
if(rc == CAIRO_STATUS_SUCCESS){
return 200;
} else {
return 500;
}
}
// ============================================================================
// End of Source Code
// ============================================================================