Re: Code::Blocks and Magick++.h

M:\DEV\Empire - Codeblocks\Empire In The Sky\ImageLoaders.cpp|14|error:
request for member 'read' in 'magick', which is of non-class type
'Magick::Image()'|


This is not GraphicsMagick, it is ImageMagick, which is why those methods
may not be found.  Where can i get prebuilt mingw-compatible binaries for
graphicsmagick?


On Sun, Apr 14, 2013 at 10:47 AM, Bob Friesenhahn <
[email protected]> wrote:

> On Fri, 12 Apr 2013, Herbert Elwood Gilliland III wrote:
>
>  I want to use ImageMagick / GraphicsMagick to load texture data into
>> OpenGL as a cross-platform solution.  I'm
>> using Code::Blocks.  I cannot find good information regarding use of
>> ImageMagick in Code::Blocks.
>>
>> 1) Does anyone have a working, relatively recent and definitive guide to
>> getting Code::Blocks to find and
>> properly use Magick++.h?  I am using the OpenGL template for mingw/gcc on
>> Windows platform.
>> 2) I have written this code for Loading, which loads an image into a "CPU
>> Image" based from data collected by
>> Magick++.h  -- I have another version that uses GDI+ as a fallback for
>> MSVC++.  Is this what it should be?
>>
>
> This code can not compile.
>
>
>
>> bool Load( string filename, Indexed<GLubyte> *pixels, int *w, int *h ) {
>>  Magick::Image magick();
>>  magick.read(filename.c_str())**;
>>
>
> The filename argument is already a std::string so you should remove the
> .c_str() bit since it is just doing more work.
>
>   *w=(int) magick.GetWidth();
>>  *h=(int) magick.GetHeight();
>>
>
> There are no GetWidth() and GetHeight() methods, however there are
> columns() and rows() methods which behave as you expect.
>
>
>   Magick::Color sample;
>>  (*pixels).Size( (size_t) w * 4, (size_t) h );
>>
>
> I am not familiar with the GLU API but the above can likely be written
>
> pixels->Size( (size_t) w * 4, (size_t) h );
>
> since pixels is a pointer.
>
>
>   PixelPacket *pix=magick.getPixels(0,0,w,h)**;
>>  for ( int x=0; x<w; x++ ) for ( int y=0; y<h; y++ ) {
>>
>
> This strategy is not good.  It is much better to use getPixels() to get
> just one row at a time rather than the whole image.  This is more scalable
> to larger images, works better with the CPU cache, is likely to optimize
> better, and simplifies the using code.  So move the getPixels() into the
> loop.  If you need to do something like change the row order, then you can
> simply change the 'y' loop:
>
>
>   for ( int x=0; x<w; x++ )
>   {
>     PixelPacket *pix=getPixels(x,0,w,1);
>
>     for ( int y=0; y<h; y++ )
>     {
>       ...
>
>
>    sample = pix[w*y+x];
>>   (*pixels)(x    ,y) = (GLubyte) (       iratiod(sample.blueQuantum(),
>>  (double) MaxRGB)*255.0 );
>>   (*pixels)(x + 1,y) = (GLubyte) (       iratiod(sample.greenQuantum(),
>> (double) MaxRGB)*255.0 );
>>   (*pixels)(x + 2,y) = (GLubyte) (       iratiod(sample.redQuantum(),
>> (double) MaxRGB)*255.0 );
>>   (*pixels)(x + 3,y) = (GLubyte) ( 1.0 / iratiod(sample.alphaQuantum(),
>> (double) MaxRGB)*255.0 );
>>  }
>>  return true;
>> }
>>
>> The Indexed template is similar to a stl vector.
>>
>
> It looks interesting.  Make sure to post your final working solution.
>
> Bob
> --
> Bob Friesenhahn
> [email protected], http://www.simplesystems.org/**
> users/bfriesen/ <http://www.simplesystems.org/users/bfriesen/>
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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