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add "ADJUST_ALPHA" image path function

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This commit is contained in:
Chris Beck 2014-11-13 13:20:56 -05:00
parent e93a974277
commit 5fd8e5afcb
2 changed files with 43 additions and 0 deletions
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27
src/image_modifications.cpp
View File

@ -210,6 +210,11 @@ surface wipe_alpha_modification::operator()(const surface& src) const
return wipe_alpha(src);
}
surface adjust_alpha_modification::operator()(const surface & src) const
{
return adjust_surface_alpha(src, amount_);
}
surface crop_modification::operator()(const surface& src) const
{
SDL_Rect area = slice_;
@ -751,6 +756,28 @@ REGISTER_MOD_PARSER(WIPE_ALPHA, )
return new wipe_alpha_modification;
}
// Adjust Alpha
REGISTER_MOD_PARSER(ADJUST_ALPHA, args)
{
const std::vector<std::string>& params = utils::split(args, ',');
if(params.size() != 1) {
ERR_DP << "~ADJUST_ALPHA() requires exactly 1 arguments" << std::endl;
return NULL;
}
std::string opacity_str = params.at(0);
const size_t p100_pos = opacity_str.find('%');
if (p100_pos == std::string::npos) {
return new adjust_alpha_modification(lexical_cast_default<fixed_t> (opacity_str));
} else {
float opacity = lexical_cast_default<float>(opacity_str.substr(0,p100_pos)) / 100.0f;
return new adjust_alpha_modification(static_cast<fixed_t> (255 * opacity));
}
}
// Color-shift
REGISTER_MOD_PARSER(CS, args)
{

16
src/image_modifications.hpp
View File

@ -239,6 +239,22 @@ public:
virtual surface operator()(const surface& src) const;
};
/**
* Adjust Alpha (ADJUST_ALPHA) modification
*/
class adjust_alpha_modification : public modification
{
public:
adjust_alpha_modification(fixed_t amount)
: amount_(amount)
{}
virtual surface operator()(const surface& src) const;
private:
fixed_t amount_;
};
/**
* Crop (CROP) modification.
*/