When doing an RGB->HSV->RGB roundtrip, the original value should be
restored (HSV, being double, has sufficient precision).
For e.g. `RGBValue(1,2,3)`, the equivalent resulting code for blue is
`trunc(int * 255.0 / 255.0)` (cast from double to int truncates).
At least with x87 FP math and its immediate 80bit extended precision
the resulting value is ~trunc(2.9999..), i.e. 2, similar problems may
exist on other architectures with other values.
Using proper rounding avoids the error magnification.
Closes https://github.com/wxWidgets/wxWidgets/pull/2078
Remove support for Borland C++ compiler, it wasn't tested since a long
time and probably didn't work anyhow and there was no interest in
keeping support for it since many years.
See https://github.com/wxWidgets/wxWidgets/pull/2087
Check for the presence of alpha channel before using it in the fallback
code.
Also add a unit test exercising this branch of the code and which
crashed before.
Fix a bug with wrong size passed to memset() introduced in 1f0ade29f0
(Fix using mask colour even if there is no mask in wxImage::Paste,
2020-09-30) which caused memory corruption and add a test (the one with
the large negative vertical offset) allowing to reproduce this reliably.
Closes https://github.com/wxWidgets/wxWidgets/pull/2067
In case an image without alpha is pasted on top of an image with alpha,
the alpha blending gives wrong results. This is caused by the fact that
the final (if nothing has been pasted yet) pixel copying algorithm in
Paste() does not take into account whether the pasted image actually
uses a mask.
To fix this:
- Add the check for image.HasMask().
- In case there is no mask, simply copy the image via memcpy.
- Finally, update the alpha channel of the changed image (if present):
whenever a pixel is copied, the alpha is set to fully opaque.
Closes https://github.com/wxWidgets/wxWidgets/pull/2065
Replace a few occurrences of
type var
= value;
with
type var =
value;
which is used much more widely in wx sources for consistency.
Also get rid of a couple of such lines, when it could be done easily.
No real changes.
Caused by arithmetic overflow of a signed addition and subsequent
right-shift of that (now negative) value and use as an array index.
Could only realistically occur on platforms where long is 32 bits.
See #18550
In wxImage, it is possible to set the Load_Verbose flag (default) if
messages are to be shown to the user in popup message boxes (via
wxLogError and wxLogWarning).
Unsetting this flag is supposed to remove these message boxes but in
practice, this was only applied in the function DoLoad() while other
messages could be issued earlier in overloads of the function LoadFile().
This commit checks if Load_Verbose is set or not and behaves accordingly
in LoadFile() overloads so that all messages can be suppressed.
See https://github.com/wxWidgets/wxWidgets/pull/920
Current algorithm used to calculate the bounds of the boxes in the source
image to which the pixels in the target (rescaled) image are mapped to, has
flaws which cause a non-uniform distribution of the boxes in the source
image. And these miscalculations may result in the visible distortions
of the colours in the rescaled image.
New algorithm assures uniform distribution of the boxes in the source image
and thanks to the integer arithmetic is faster than currently used
and not prone to the problems with floating point representation.
Closes#18012.
When wxImage is rescaled with wxIMAGE_QUALITY_BILINEAR, wxIMAGE_QUALITY_BICUBIC or wxIMAGE_QUALITY_BOX_AVERAGE algorithm then for proper interpolation there is necessary to uniformly (linearly) map entire pixel range in the new image to the entire pixel range in the current image, i.e. pixels positions (integer values) in range [0..newDim-1] has to be mapped to "virtual" pixel positions (not necessary integer values) exactly in the range [0..oldDim-1].
[0..oldDim-1] range of target mapping is required because for proper interpolation every "virtual" pixel has to be located between two physical pixels in the current image.
Thus scaling ratio used to find corresponding pixels in the current image should be (oldDim-1)/(newDim-1) and not oldDim/newDim (which is used now).
When image is e.g. upsampled oldDim/newDim ratio then some new rightmost/botommost pixels are mapped to old pixels > (oldDim-1) and their values are improperly interpolated (in the current implementation their positions are just truncated to (oldDim-1) to bypass the problem and upsampled image looks like it was shifted left/up). The larger scaling ratio the effect is more visible.
Note:
Because reference images used currently in the unit tests were created with improper scaling there is necessary to upload new reference images created with fixed scaling.
Closes#17594
Add wxImage::SetLoadFlags() and static SetDefaultLoadFlags() to allow
suppressing the warning messages that can be logged when loading some files,
notably PNG ones with invalid sRGB profiles which, unfortunately, seem to be
rather common and result in annoying warnings about them with libpng 1.6+.
Closes#15331.
Allocate our own exclusive copy of the data before modifying it, otherwise
calling ClearAlpha() would clear alpha not only for the image it was called on
but also for all the other images sharing data with it.
This ensures that we never forget to delete the handles returned by
GetIconInfo() and also centralizes the error message given if it fails in a
single place.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78132 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Make overriding virtual methods more explicit and enable additional checks
provided by C++11 compilers when "override" is used.
Closes#16100.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76173 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This would seem to make more sense and might also fix the test failures
resulting from tiny differences in arithmetic operations when compiled with
different compilers/under different architectures.
Regenerate the test files and commit (disabled) change to the unit test
allowing to do it again in the future.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This keyword is not expanded by Git which means it's not replaced with the
correct revision value in the releases made using git-based scripts and it's
confusing to have lines with unexpanded "$Id$" in the released files. As
expanding them with Git is not that simple (it could be done with git archive
and export-subst attribute) and there are not many benefits in having them in
the first place, just remove all these lines.
If nothing else, this will make an eventual transition to Git simpler.
Closes#14487.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Precompute the values used by various resampling algorithms once instead of
doing it for each pixel. This dramatically speeds them up: more than 3 times
faster in wxImage benchmark with the small images and up to 5 times faster
with larger images.
Closes#15281.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74321 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Embarrassingly, wxIMAGE_QUALITY_HIGH was never used as it had the same value
as wxIMAGE_QUALITY_BILINEAR due to the changes to these constants in r67203.
After fixing its value in the enum, also change the switch on this enum
elements to avoid g++ warnings about unhandled enum values.
See #12845, #15281.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74309 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Don't check for impossible enum element value, it's better to not have the
default clause at all to get a warning from g++ if this enum ever changes
later. And for now the presence of default results in a warning from Coverity
about unreachable code.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73147 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Calling InitAlpha() when we already had loaded alpha from the resource data
results in an assert. Fix this by only initializing alpha if don't have it
yet.
Closes#14643.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72471 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Assignment operator of AutoHBITMAP doesn't work as expected (and probably
should be removed/fixed), avoid its use by explicitly calling Init().
Closes#14425.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71911 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use wxBITMAP_TYPE_{BMP,CUR,ICON}_RESOURCE by default under Windows, even for
non-wxMSW ports.
Also allow loading wxImage from resources in all ports under MSW as a side
effect of this change.
Closes#14425.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71889 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Additionally renamed wxOSX' private wxNativePrinterDC::Ok() function to IsOk().
Didn't deprecate the various Ok() functions: given the amount of changes already introduced in 3.0 a trivial one like this seems more suitable for after 3.0.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67681 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Replace the test of the form "(!a && b) || (a && b)" with a simple test for
"b" and then also replace the test for "b || (c && !b)" with just "b || c".
The end result is much easier to read and understand.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67614 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
The changes of r66309 optimized the rotation of the pixel data by doing it in
entire strips instead of pixel by pixel, apply the same technique now to the
rotation of alpha data as well.
Closes#12739.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67613 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Made the following changes:
* Formerly specifying to resize using wxIMAGE_QUALITY_BICUBIC or wxIMAGE_QUALITY_BILINEAR could result in the ResampleBox method being used. Now always resize with the method that the user actually specified.
* Added wxIMAGE_QUALITY_BOX_AVERAGE to explicitly allow resizing with the ResampleBox method.
* Previously wxIMAGE_QUALITY_HIGH was equal to wxIMAGE_QUALITY_BICUBIC. It has been changed to use wxIMAGE_QUALITY_BOX_AVERAGE when reducing the size of an image and wxIMAGE_QUALITY_BICUBIC in all other cases.
Closes#12845.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67203 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Previously when resizing by more than 50% (for example resizing from 100x100 to 51x51 or 140x140) a box size of 1x1 would be used which effectively would give the same result as using nearest neighbour. Make sure that at least a box size of 2x2 pixels is always used.
Patch by scottb, see also #12845.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67202 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
For seekable streams, don't change the current position when loading image
fails. This allows the subsequent image handlers to succeed during image
format auto-detection even if a previous, erroneously chosen, handler failed.
Closes#12702.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66252 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
