OOPixMapChannelOperations.h File Reference

import "OOPixMap.h"

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Functions
BOOL	OOExtractPixMapChannel (OOPixMap *ioPixMap, uint8_t channelIndex, BOOL compactWhenDone)
BOOL	OOPixMapToRGBA (OOPixMap *ioPixMap)
BOOL	OOPixMapModulateUniform (OOPixMap *ioPixMap, float f0, float f1, float f2, float f3)
BOOL	OOPixMapModulatePixMap (OOPixMap *ioDstPixMap, OOPixMap otherPixMap)
BOOL	OOPixMapAddPixMap (OOPixMap *ioDstPixMap, OOPixMap otherPixMap)

Function Documentation

OOExtractPixMapChannel()

BOOL OOExtractPixMapChannel	(	OOPixMap *	ioPixMap,
		uint8_t	channelIndex,
		BOOL	compactWhenDone
	)

Definition at line 40 of file OOPixMapChannelOperations.m.

{
    if (EXPECT_NOT(ioPixMap == NULL || !OOIsValidPixMap(*ioPixMap) || ioPixMap->format != kOOPixMapRGBA || channelIndex > 3))
    {
        return NO;
    }
    
    ExtractChannel_4(ioPixMap, channelIndex);
    
    ioPixMap->format = kOOPixMapGrayscale;
    ioPixMap->rowBytes = ioPixMap->width;
    
    if (compactWhenDone)
    {
        OOCompactPixMap(ioPixMap);
    }
    
    return YES;
}

References EXPECT_NOT, ExtractChannel_4(), OOPixMap::format, kOOPixMapGrayscale, kOOPixMapRGBA, OOCompactPixMap(), OOIsValidPixMap(), OOPixMap::rowBytes, and OOPixMap::width.

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OOPixMapAddPixMap()

BOOL OOPixMapAddPixMap	(	OOPixMap *	ioDstPixMap,
		OOPixMap	otherPixMap
	)

Definition at line 301 of file OOPixMapChannelOperations.m.

{
    if (EXPECT_NOT(ioDstPixMap == NULL || !OOIsValidPixMap(*ioDstPixMap)))  return NO;
    if (EXPECT_NOT(!OOIsValidPixMap(otherPixMap) || otherPixMap.format != kOOPixMapRGBA))  return NO;
    if (EXPECT_NOT(!OOPixMapToRGBA(ioDstPixMap)))  return NO;
    if (EXPECT_NOT(ioDstPixMap->width != otherPixMap.width || ioDstPixMap->height != otherPixMap.height))  return NO;
    
    AddPixMap_4(*ioDstPixMap, otherPixMap);
    
    return YES;
}

References AddPixMap_4(), EXPECT_NOT, OOPixMap::format, OOPixMap::height, kOOPixMapRGBA, OOIsValidPixMap(), OOPixMapToRGBA(), and OOPixMap::width.

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OOPixMapModulatePixMap()

BOOL OOPixMapModulatePixMap	(	OOPixMap *	ioDstPixMap,
		OOPixMap	otherPixMap
	)

Definition at line 242 of file OOPixMapChannelOperations.m.

{
    if (EXPECT_NOT(ioDstPixMap == NULL || !OOIsValidPixMap(*ioDstPixMap)))  return NO;
    if (EXPECT_NOT(!OOIsValidPixMap(otherPixMap) || otherPixMap.format != kOOPixMapRGBA))  return NO;
    if (EXPECT_NOT(!OOPixMapToRGBA(ioDstPixMap)))  return NO;
    if (EXPECT_NOT(ioDstPixMap->width != otherPixMap.width || ioDstPixMap->height != otherPixMap.height))  return NO;
    
    ModulatePixMap_4(*ioDstPixMap, otherPixMap);
    
    return YES;
}

References EXPECT_NOT, OOPixMap::format, OOPixMap::height, kOOPixMapRGBA, ModulatePixMap_4(), OOIsValidPixMap(), OOPixMapToRGBA(), and OOPixMap::width.

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OOPixMapModulateUniform()

BOOL OOPixMapModulateUniform	(	OOPixMap *	ioPixMap,
		float	f0,
		float	f1,
		float	f2,
		float	f3
	)

Definition at line 185 of file OOPixMapChannelOperations.m.

{
    if (EXPECT_NOT(ioPixMap == NULL || !OOIsValidPixMap(*ioPixMap)))  return NO;
    if (EXPECT_NOT(!OOPixMapToRGBA(ioPixMap)))  return NO;
    
    ModulateUniform_4(*ioPixMap, f0 * 256.0f, f1 * 256.0f, f2 * 256.0f, f3 * 256.0f);
    
    return YES;
}

References EXPECT_NOT, ModulateUniform_4(), OOIsValidPixMap(), and OOPixMapToRGBA().

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OOPixMapToRGBA()

BOOL OOPixMapToRGBA

(

OOPixMap *

ioPixMap

)

Definition at line 87 of file OOPixMapChannelOperations.m.

{
    if (EXPECT_NOT(ioPixMap == NULL || !OOIsValidPixMap(*ioPixMap)))  return NO;
    if (ioPixMap->format == kOOPixMapRGBA)  return YES;
    
    OOPixMap temp = OOAllocatePixMap(ioPixMap->width, ioPixMap->height, 4, 0, 0);
    if (EXPECT_NOT(OOIsNullPixMap(temp)))  return NO;
    
    BOOL OK = NO;
    switch (ioPixMap->format)
    {
        case kOOPixMapGrayscale:
            ToRGBA_1(*ioPixMap, temp);
            OK = YES;
            break;
            
        case kOOPixMapGrayscaleAlpha:
            ToRGBA_2(*ioPixMap, temp);
            OK = YES;
            break;
            
        case kOOPixMapRGBA:
        case kOOPixMapInvalidFormat:
            OK = NO;
            break;
            // No default, because -Wswitch-enum is our friend.
    }
    
    if (OK)
    {
        free(ioPixMap->pixels);
        *ioPixMap = temp;
    }
    else
    {
        free(temp.pixels);
    }
 
    return OK;
}

References EXPECT_NOT, OOPixMap::format, OOPixMap::height, kOOPixMapGrayscale, kOOPixMapGrayscaleAlpha, kOOPixMapInvalidFormat, kOOPixMapRGBA, OOAllocatePixMap(), OOIsNullPixMap(), OOIsValidPixMap(), OOPixMap::pixels, ToRGBA_1(), ToRGBA_2(), and OOPixMap::width.

Referenced by OOPixMapAddPixMap(), OOPixMapModulatePixMap(), and OOPixMapModulateUniform().

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