How do I multiply pixels on an SDL Surface?

Posted by NoobScratcher on Game Development See other posts from Game Development or by NoobScratcher
Published on 2012-10-05T14:46:04Z Indexed on 2012/10/05 15:55 UTC
Read the original article Hit count: 231

Filed under:

sdl

|

pixel

Okay so I'm able to put blank pixels into a surface and also draw gradient pixels rectangles,etc

But I don't know how to multiply the pixels on a surface so I was hoping someone could provide me information on this topic.

I was thinking you could get the members pixel and then * it by 2 but that didn't provide results I wanted so I'm now thinking that you have to actually get to the position in bytes in one location to the left and one location to the right and then store it in memory and then * that by 2 am I correct or what?

If so what is it that allows me to do that and how do I do that?

© Game Development or respective owner

Related posts about sdl

Compiling SDL under Windows with sdl-config

as seen on Game Development - Search for 'Game Development'
I have downloaded NXEngine (The Open Source version of Cave Story). I have a make file in the directory, which I execute using msys. However, the make file uses sdl-config: g++ -g -O2 -c main.cpp -D DEBUG `sdl-config --cflags` -Wreturn-type -Wformat -Wno-multichar -o main.o /bin/sh: sdl-config: command… >>> More
How can I get the palette of an 8-bit surface in SDL.NET/Tao.SDL?

as seen on Game Development - Search for 'Game Development'
I'm looking to get the palette of an 8-bit surface in SDL.NET if possible, or (more than likely) using Tao.SDL. This is because I want to do palette swapping with the palette directly, instead of blitting surfaces together to replace colours like how you would do it with a 32-bit surface. I've gotten… >>> More
Using SDL to replace colors using SDL Color Keys

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey, I am working an a simple Roguelike game, and using SDL as the display. The Graphics for the game is an image of Codepage 437, with the background being black, and the font white. Instead of using many seperate image files that are already colored, I want to use one image file, and replace… >>> More
Where is sdl-config installed on MacOS 10.6 (Snow Leopard)

as seen on Stack Overflow - Search for 'Stack Overflow'
After installing SDL and SDL-devel in MacOS X 10.6 (Snow Leopard), trying to configure some source code that requires SDL yields: checking for sdl-config... no checking for SDL - version >= 1.2.0... no *** The sdl-config script installed by SDL could not be found *** If SDL was installed in PREFIX… >>> More
Implementing the Security Development Lifecycle (SDL) at a Large Insurance Company

as seen on Dot net Slackers - Search for 'Dot net Slackers'
Find out how Cigital, an SDL Pro Network member, assisted a large insurance company adopt the Microsoft SDL. The case study describes both the business drivers leading up to the company's recognizing the need for incorporating the SDL within their development process as well as the initial roll out… >>> More

Related posts about pixel

A pixel is not a pixel is not a pixel

as seen on Dot net Slackers - Search for 'Dot net Slackers'
Yesterday John Gruber wrote about the upped pixel density in the upcoming iPhone (960x480 instead of 480x320), and why Apple did this. He also wondered what the consequences for web developers would be.Now I happen to be deeply engaged in cross-browser research of widths and heights on mobile phones… >>> More
Image per pixel enumeration, pixel format conversion and more

as seen on Code Project - Search for 'Code Project'
A set of handy extension methods, to help you with quick Image modifications. >>> More
Comparsion between Pixel Bender(in Flash) and Pixel Shaders(in Silverlight)

as seen on Stack Overflow - Search for 'Stack Overflow'
Can someone explain the different between Pixel Bender in Flash and Pixel Shader(HLSL) in Silverlight in terms of programming flexibility and run-time performance? >>> More
Comparing bitmap data in AS3 pixel for pixel

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am looking for a fairly simple image comparison method in AS3. I have taken an image from a web cam (with no subject) passed it in to bitmap data, then a second image is taken (this time with a subject) to compare this data, from these two images I would like to create a mask from the pixels… >>> More
How to get skin tone color pixel in iPhone?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi In my application I m using following way to get red pixel in a image // // PixelsAccessAppDelegate.h // PixelsAccess // // Created by Fortune1 on 14/04/10. // Copyright MyCompanyName 2010. All rights reserved. // import @class clsPixelAccess; NSUInteger numberOfRedPixels; NSUInteger numberOfRedPixels1; NSUInteger… >>> More