Add cairo framebuffer example
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<listOptionValue builtIn="false" value="cairo"/>
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<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
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<additionalInput kind="additionalinput" paths="$(LIBS)"/>
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<storageModule moduleId="refreshScope"/>
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@ -0,0 +1 @@
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/Debug/
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@ -0,0 +1,26 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>cairo</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
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<triggers>clean,full,incremental,</triggers>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
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<triggers>full,incremental,</triggers>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.cdt.core.cnature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
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</natures>
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</projectDescription>
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@ -0,0 +1,14 @@
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<project>
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<configuration id="cdt.managedbuild.config.gnu.cross.exe.debug.1978501621" name="Debug">
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<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
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<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
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<provider class="org.eclipse.cdt.internal.build.crossgcc.CrossGCCBuiltinSpecsDetector" console="false" env-hash="643270697067650404" id="org.eclipse.cdt.build.crossgcc.CrossGCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT Cross GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"" prefer-non-shared="true">
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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<language-scope id="org.eclipse.cdt.core.g++"/>
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</provider>
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</extension>
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</configuration>
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</project>
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@ -0,0 +1,174 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <linux/fb.h>
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#include <sys/mman.h>
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#include <cairo/cairo.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#define DELAY_IN_SECS 5
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#define SCALE_WIDTH 256.0
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#define SCALE_HEIGHT 256.0
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typedef struct _cairo_linuxfb_device {
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int fb_fd;
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unsigned char *fb_data;
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long fb_screensize;
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struct fb_var_screeninfo fb_vinfo;
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struct fb_fix_screeninfo fb_finfo;
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} cairo_linuxfb_device_t;
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/* Destroy a cairo surface */
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void cairo_linuxfb_surface_destroy(void *device)
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{
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cairo_linuxfb_device_t *dev = (cairo_linuxfb_device_t *)device;
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if (dev == NULL)
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return;
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munmap(dev->fb_data, dev->fb_screensize);
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close(dev->fb_fd);
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free(dev);
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}
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/* Create a cairo surface using the specified framebuffer */
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cairo_surface_t *cairo_linuxfb_surface_create(const char *fb_name)
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{
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cairo_linuxfb_device_t *device;
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cairo_surface_t *surface;
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/* Use fb0 if no fram buffer is specified */
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if (fb_name == NULL) {
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fb_name = "/dev/fb0";
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}
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device = malloc(sizeof(*device));
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if (!device) {
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perror("Error: cannot allocate memory\n");
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exit(1);
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}
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// Open the file for reading and writing
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device->fb_fd = open(fb_name, O_RDWR);
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if (device->fb_fd == -1) {
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perror("Error: cannot open framebuffer device");
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goto handle_allocate_error;
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}
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// Get variable screen information
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if (ioctl(device->fb_fd, FBIOGET_VSCREENINFO, &device->fb_vinfo) == -1) {
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perror("Error: reading variable information");
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goto handle_ioctl_error;
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}
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// Figure out the size of the screen in bytes
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device->fb_screensize = device->fb_vinfo.xres * device->fb_vinfo.yres
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* device->fb_vinfo.bits_per_pixel / 8;
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// Map the device to memory
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device->fb_data = (unsigned char *)mmap(0, device->fb_screensize,
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PROT_READ | PROT_WRITE, MAP_SHARED,
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device->fb_fd, 0);
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if ((int)device->fb_data == -1) {
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perror("Error: failed to map framebuffer device to memory");
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goto handle_ioctl_error;
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}
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// Get fixed screen information
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if (ioctl(device->fb_fd, FBIOGET_FSCREENINFO, &device->fb_finfo) == -1) {
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perror("Error reading fixed information");
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goto handle_ioctl_error;
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}
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/* Create the cairo surface which will be used to draw to */
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surface = cairo_image_surface_create_for_data(device->fb_data,
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CAIRO_FORMAT_RGB16_565,
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device->fb_vinfo.xres,
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device->fb_vinfo.yres,
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cairo_format_stride_for_width(CAIRO_FORMAT_RGB16_565,
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device->fb_vinfo.xres));
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cairo_surface_set_user_data(surface, NULL, device,
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&cairo_linuxfb_surface_destroy);
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return surface;
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handle_ioctl_error:
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close(device->fb_fd);
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handle_allocate_error:
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free(device);
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exit(1);
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}
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int main(int argc, char *argv[]) {
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int image_width;
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int image_height;
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char frame_buffer_number;
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char fb_node[16] = {0};
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cairo_surface_t *surface;
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cairo_surface_t *image;
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cairo_t *cr;
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if (argc != 2) {
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printf("Usage: ./cairo /path/to/png/image\n");
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exit(1);
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}
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if (strstr(argv[1], ".png") == NULL) {
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printf("Only png images are supported with this example\n");
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exit(1);
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}
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printf("Enter frame buffer number:\t");
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scanf("%c", &frame_buffer_number);
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sprintf(fb_node, "/dev/fb");
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fb_node[strlen(fb_node)] = frame_buffer_number;
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fb_node[strlen(fb_node)] = '\0';
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printf("Frame buffer node is: %s\n", fb_node);
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surface = cairo_linuxfb_surface_create(fb_node);
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cr = cairo_create(surface);
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/*
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* We clear the cairo surface here before drawing
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* This is required in case something was drawn on this surface
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* previously, the previous contents would not be cleared without this.
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*/
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cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
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cairo_paint(cr);
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cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
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cairo_select_font_face(cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
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cairo_set_font_size(cr, 32.0);
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cairo_set_source_rgb(cr, 1.0, 1.0, 0.0);
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cairo_move_to(cr, 100, 300);
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cairo_show_text(cr, "Toradex Cairo Example!");
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/* Wait for the result of drawing operation to persist for the user to see */
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sleep(DELAY_IN_SECS);
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/* Clear the surface and prepare for a new drawing operation */
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cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
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cairo_paint(cr);
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cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
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image = cairo_image_surface_create_from_png(argv[1]);
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image_width = cairo_image_surface_get_width(image);
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image_height = cairo_image_surface_get_height(image);
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/* Scale the image arbitrarily */
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cairo_scale(cr, SCALE_WIDTH/image_width, SCALE_HEIGHT/image_height);
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cairo_set_source_surface(cr, image, 350, 200);
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cairo_paint(cr);
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/* Wait for the result of the drawing operation to persist for the user to see */
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sleep(DELAY_IN_SECS);
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/* Destroy and release all cairo related contexts */
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cairo_destroy(cr);
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cairo_surface_destroy(surface);
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return 0;
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}
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