c++ - SDL2 / SDL Image strange PNG behavior with RGB values -

-

I have found an interesting thing that I am not able to debug but I want to solve because it is for development Important I need a small device.

Actually, all reduce the fact that I have a PNG load in SDL_Surface IMG_Load ("filename.png") . The skeleton of the code is 

  surface = IMG_Load ("filename.png");

Then apply this tool to pixels by a pixel by implementing a color map (which is a unordered_map gt; ) Should copy. It works basically, but there are slight changes in the RGB values ​​of several pixels, so this replacement fails. For example, when a pixel 255,255,255 is correctly stored in the form of 0xFFFFFFFF in the surface, another pixel, let's become 81, 60,48 82,62,51, I thought of gamma correction, but the image itself Because the color switch is applied before two surfaces, and later pulled on any texture.

Any clues? I am not interested in finding a second solution to my problem because I should be able to make accurate pixel color switching with a certain map, I should understand why this is happening (because PNG should have accurate value Lossless) And solve it.

OK, I got the reason and the problem that was fixed is how PNG OS X frameworks Is loaded through. According to the thread, it is related to the image, which is taken in any way while loading the image. The following is proposed: 

  CGFLot whitepoint [3] = {1, 1, 1}; CGFloat Black Point [3] = {0, 0, 0}; CGFloat Gamma [3] = {2.2, 2.2, 2.2}; CGFloat matrix [9] = {1, 1, 1, 1, 1, 1, 1, 1, 1}; CGColorSpaceRef color_space = CGColorSpaceCreateCalibratedRGB (white point, blackpoint, gamma, matrix); I was surprised by   
  imageIO.m  
 
  SDL_Image  and it was resolved by reconfiguring it from source sources. That is why it has not been included in SDL_Image (or, rather, only one version with custom values).

Comments

Post a Comment

Popular posts from this blog

java - org.apache.http.ProtocolException: Target host is not specified -

-
I have written a simple httprequest / response code and I am getting this error below: I used to type in my classpath httpclient, httpcore, common -Codecs and general logging. I am very new to Java and I do not know what's going on here. Please help me. code: import org.apache.http.client.HttpClient; Import org.apache.http.client.methods.HttpGet; Import org.apache.http.HttpResponse; Import org.apache.http.impl.client.HttpClientBuilder; Import org.apache.http.Header; Import org.apache.http.HttpHeaders; Public class UnshorteningUrl {public static zero main (string [] args throws exception {HttpGet request = zero; HTTP Client Client = HTTP ClientBuilder.credit (). Build (); Try {Request = New HTTP Gate ("trib.me/1lBFzSi"); HttpResponse httpResponse = client.execute (request); Header [] header = httpResponse.getHeaders (HttpHeaders.LOCATION); // Preconditions.checkState (headers.length == 1); String new url = header [0] .getValue (); System.out.println ("new url...
Read more

java - Gradle dependencies: compile project by relative path -

-
Is it possible to specify a dependency on another gradeal project in the granular (in android studios) outside the current project limits? For example, with a relative path like this: dependence {collection project ('../../ stdlib / dagger'}} MyApp (path / user / foo / workspace / mypad) The app (Path / User / Foo / Workspace / MyPass / App) And I have an Android Library Project with 3 subdomules: stdlib (path is / user / foo / Utilities (Path / User / Foo / Workspace / Stadlib / Utilis) http (Path / User / Foo / Workspace / Stadlib / HT) / Li> What I have to do is compile the Dagger, Util, http module in the MyApp project. The Stidelib Library module under heavy development And MyApp will grow in the form of Growth, so I do not want to push them into a Mewen repository. I am a little change. is likely to add another Gredle projects in some way? I will push the study library into the Maven repository after the source is in search of a temp...
Read more

ruby on rails - Object doesn't support #inspect when used with .include -

-
So I have participated in a glitch error that I do not even know how to debug. I am very new to the railing, so it has kicked my ass well when I use the .includes (school) seen by the student, it gives a blue box error, But when I look at any other model and .includes (school) , the school works just fine. class student & lt; ActiveRecord :: Base has has_many: relationships, foreign_key: "liker_id", dependent :: has_many: matches, foreign_key: "student_1_id", dependent :: deleted belong_to: school belong_to: conference belong_to: would_you_rather belong_to: home city belong_to: year is_to: Major and class school & lt; on the console activatecord :: Affiliate for the base: conference includes: respondent, class: "school", foreign_key: "rival_id" (e.g. For: School) Select SQL generated Select "School". * "School" from "school" "ID" IN (1) error message back NoMethodError: u...
Read more