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| author | Tor Andersson <tor.andersson@artifex.com> | 2014-08-22 15:35:13 +0200 |
|---|---|---|
| committer | Tor Andersson <tor.andersson@artifex.com> | 2014-08-27 13:15:56 +0200 |
| commit | 7662af082b44f8164d1adadc5688f30d888e6a63 (patch) | |
| tree | 61867c232cebef6f510eef1e404f81c4411c4c2e /include | |
| parent | 357162fe1eaec81638611d57ed178d8dfc3cdc47 (diff) | |
| download | mupdf-7662af082b44f8164d1adadc5688f30d888e6a63.tar.xz | |
Revise test-device; thresholding and exhaustive checking.
The original version of the test-device could characterise pages
as being grayscale/color purely based on the colorspaces used.
This could easily be upset by grayscale images or shadings that
happened to be specified in non-grayscale colorspaces however.
We now look at the actual shading and image color values, and use
a threshold value to allow for some measure of rounding errors in
color values that are in practice grayscale.
Diffstat (limited to 'include')
| -rw-r--r-- | include/mupdf/fitz/device.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/mupdf/fitz/device.h b/include/mupdf/fitz/device.h index 18dc4881..ef27cd5d 100644 --- a/include/mupdf/fitz/device.h +++ b/include/mupdf/fitz/device.h @@ -290,8 +290,12 @@ fz_device *fz_new_bbox_device(fz_context *ctx, fz_rect *rectp); fz_new_test_device: Create a device to test for features. Currently only tests for the presence of non-grayscale colors. + + threshold: The difference from grayscale that will be tolerated. + Typical values to use are either 0 (be exact) and 0.02 (allow an + imperceptible amount of slop). */ -fz_device *fz_new_test_device(fz_context *ctx, int *iscolor); +fz_device *fz_new_test_device(fz_context *ctx, int *is_color, float threshold); /* fz_new_draw_device: Create a device to draw on a pixmap. |