Attachment 38814 Details for Bug 30282 – Sample program attempting to copy+scale PDF to Image

Sample program attempting to copy+scale PDF to Image

copy.c (text/plain), 3.32 KB, created by Ian Britten on 2010-09-20 08:16:28 UTC

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Creator: Ian Britten

Created: 2010-09-20 08:16:28 UTC

Size: 3.32 KB

patch

obsolete

>#include <cairo/cairo.h>
>#include <cairo/cairo-pdf.h>
>
>#include <math.h>
>
>// Build with:
>// gcc -g `pkg-config --cflags --libs cairo` copy.c
>int main(int argc, char *argv[])
>{
>
>        // Make a PDF surface
>        const char fileName[] = "unused.pdf";
>        const double pntWidth = 1000;
>        const double pntHeight = 1000;
>        cairo_surface_t *pdfSurface = cairo_pdf_surface_create(
>                        fileName, pntWidth, pntHeight);
>        cairo_t *pdfContext = cairo_create(pdfSurface);
>
>        const double xMinUser = 0.0;
>        const double yMinUser = 0.0;
>        const double xMaxUser = 10000.0;
>        const double yMaxUser = 10000.0;
>
>        // Set up the transform (rotation, etc)
>        {
>                const double userWidth = xMaxUser - xMinUser;
>                const double userHeight = yMaxUser - yMinUser;
>                const double scaleX = pntWidth / userWidth;
>                const double scaleY = pntHeight / userHeight;
>
>                // Rotate about the centre of the VP
>                const int vpCenX = pntWidth / 2;
>                const int vpCenY = pntHeight / 2;
>                const double txRotRad = 0 * M_PI / 180.0;
>                cairo_translate(pdfContext, vpCenX, vpCenY);
>                cairo_rotate(pdfContext, txRotRad);
>                cairo_translate(pdfContext, -vpCenX, -vpCenY);
>
>                cairo_translate(pdfContext, 0, pntHeight);
>                cairo_scale(pdfContext, scaleX, -scaleY);
>                cairo_translate(pdfContext, -xMinUser, -yMinUser);
>
>        }
>
>        // Draw a bunch of stuff
>        {
>                // Line
>                cairo_move_to(pdfContext, xMaxUser-100, yMaxUser-100);
>                cairo_line_to(pdfContext, xMinUser+100, yMinUser+100);
>                cairo_set_source_rgba(pdfContext, 1.0, 0.0, 0.0, 1);
>                cairo_stroke(pdfContext);
>
>                // Polygon
>                cairo_move_to(pdfContext, (xMinUser + xMaxUser)/2.0,
>                              (yMinUser + yMaxUser)/2.0);
>                cairo_rel_line_to(pdfContext, 0, 250);
>                cairo_rel_line_to(pdfContext, -250, -250);
>                cairo_close_path(pdfContext);
>                cairo_set_source_rgba(pdfContext, 0.0, 0.0, 1.0, 1);
>                cairo_fill(pdfContext);
>        }
>
>
>        // Make the image surface
>        const int pixWidth = 1000;
>        const int pixHeight = 1000;
>        cairo_surface_t *imgSurface = cairo_image_surface_create(
>                CAIRO_FORMAT_RGB24, pixWidth, pixHeight);
>        cairo_t *imgContext = cairo_create(imgSurface);
>        cairo_set_antialias(imgContext, CAIRO_ANTIALIAS_NONE);
>
>        // Copy the PDF to the image
>        {
>                cairo_translate(imgContext, -11200, -11200);
>                cairo_scale(imgContext, 24, 24);
>                cairo_set_source_surface(imgContext, pdfSurface, 0, 0);
>                cairo_paint(imgContext);
>
>/*                 // The whole surface */
>/*                 cairo_set_source_surface(imgContext, pdfSurface, 0, 0); */
>/*                 cairo_paint(imgContext); */
>        }
>
>        cairo_surface_write_to_png(imgSurface, "output.png");
>        cairo_destroy(imgContext);
>        cairo_destroy(pdfContext);
>        cairo_surface_destroy(imgSurface);
>        cairo_surface_destroy(pdfSurface);
>
>        cairo_debug_reset_static_data(); // Valgrind
>
>        return 0;
>}

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Attachments on bug 30282: 38813 | 38814 | 38846

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