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image_processing_effects.c
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#include "global.h"
#include "image_processing_effects.h"
#include "contest_painting.h"
#include "constants/rgb.h"
// IWRAM common
COMMON_DATA u8 gCanvasColumnStart = 0;
COMMON_DATA u16 *gCanvasPixels = NULL;
COMMON_DATA u8 gCanvasRowEnd = 0;
COMMON_DATA u8 gCanvasHeight = 0;
COMMON_DATA u8 gCanvasColumnEnd = 0;
COMMON_DATA u8 gCanvasRowStart = 0;
COMMON_DATA u8 gCanvasMonPersonality = 0;
COMMON_DATA u8 gCanvasWidth = 0;
COMMON_DATA u16 *gCanvasPalette = NULL;
COMMON_DATA u16 gCanvasPaletteStart = 0;
static void ApplyImageEffect_Pointillism(void);
static void ApplyImageEffect_Blur(void);
static void ApplyImageEffect_BlackOutline(void);
static void ApplyImageEffect_Invert(void);
static void ApplyImageEffect_BlackAndWhite(void);
static void ApplyImageEffect_BlurRight(void);
static void ApplyImageEffect_BlurDown(void);
static void ApplyImageEffect_Shimmer(void);
static void ApplyImageEffect_Grayscale(void);
static void ApplyImageEffect_PersonalityColor(u8);
static void ApplyImageEffect_RedChannelGrayscale(u8);
static void ApplyImageEffect_RedChannelGrayscaleHighlight(u8);
static void AddPointillismPoints(u16);
static u16 ConvertColorToGrayscale(u16 *);
static u16 QuantizePixel_Blur(u16 *, u16 *, u16 *);
static u16 QuantizePixel_PersonalityColor(u16 *, u8);
static u16 QuantizePixel_BlackAndWhite(u16 *);
static u16 QuantizePixel_BlackOutline(u16 *, u16 *);
static u16 QuantizePixel_Invert(u16 *);
static u16 QuantizePixel_BlurHard(u16 *, u16 *, u16 *);
static u16 QuantizePixel_MotionBlur(u16 *, u16 *);
static u16 GetColorFromPersonality(u8);
static void QuantizePalette_Standard(bool8);
static void SetPresetPalette_PrimaryColors(void);
static void QuantizePalette_PrimaryColors(void);
static void SetPresetPalette_Grayscale(void);
static void QuantizePalette_Grayscale(void);
static void SetPresetPalette_GrayscaleSmall(void);
static void QuantizePalette_GrayscaleSmall(void);
static void SetPresetPalette_BlackAndWhite(void);
static void QuantizePalette_BlackAndWhite(void);
static u16 QuantizePixel_Standard(u16 *);
static u16 QuantizePixel_GrayscaleSmall(u16 *);
static u16 QuantizePixel_Grayscale(u16 *);
static u16 QuantizePixel_PrimaryColors(u16 *);
#define MAX_DIMENSION 64
#include "data/pointillism_points.h"
void ApplyImageProcessingEffects(struct ImageProcessingContext *context)
{
gCanvasPixels = context->canvasPixels;
gCanvasMonPersonality = context->personality;
gCanvasColumnStart = context->columnStart;
gCanvasRowStart = context->rowStart;
gCanvasColumnEnd = context->columnEnd;
gCanvasRowEnd = context->rowEnd;
gCanvasWidth = context->canvasWidth;
gCanvasHeight = context->canvasHeight;
switch (context->effect)
{
case IMAGE_EFFECT_POINTILLISM:
ApplyImageEffect_Pointillism();
break;
case IMAGE_EFFECT_BLUR:
ApplyImageEffect_Blur();
break;
case IMAGE_EFFECT_OUTLINE_COLORED:
ApplyImageEffect_BlackOutline();
ApplyImageEffect_PersonalityColor(gCanvasMonPersonality);
break;
case IMAGE_EFFECT_INVERT_BLACK_WHITE:
ApplyImageEffect_BlackOutline();
ApplyImageEffect_Invert();
ApplyImageEffect_BlackAndWhite();
case IMAGE_EFFECT_INVERT:
ApplyImageEffect_Invert();
break;
case IMAGE_EFFECT_THICK_BLACK_WHITE:
ApplyImageEffect_BlackOutline();
ApplyImageEffect_BlurRight();
ApplyImageEffect_BlurRight();
ApplyImageEffect_BlurDown();
ApplyImageEffect_BlackAndWhite();
break;
case IMAGE_EFFECT_SHIMMER:
ApplyImageEffect_Shimmer();
break;
case IMAGE_EFFECT_OUTLINE:
ApplyImageEffect_BlackOutline();
break;
case IMAGE_EFFECT_BLUR_RIGHT:
ApplyImageEffect_BlurRight();
break;
case IMAGE_EFFECT_BLUR_DOWN:
ApplyImageEffect_BlurDown();
break;
case IMAGE_EFFECT_GRAYSCALE_LIGHT:
ApplyImageEffect_Grayscale();
ApplyImageEffect_RedChannelGrayscale(3);
break;
case IMAGE_EFFECT_CHARCOAL:
ApplyImageEffect_BlackOutline();
ApplyImageEffect_BlurRight();
ApplyImageEffect_BlurDown();
ApplyImageEffect_BlackAndWhite();
ApplyImageEffect_Blur();
ApplyImageEffect_Blur();
ApplyImageEffect_RedChannelGrayscale(2);
ApplyImageEffect_RedChannelGrayscaleHighlight(4);
break;
}
}
static void ApplyImageEffect_RedChannelGrayscale(u8 delta)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
{
// Gets the grayscale value, based on the pixel's red channel.
// Also adds a delta to skew lighter or darker.
u8 grayValue = (*pixel & RGB_RED);
grayValue += delta;
if (grayValue > 31)
grayValue = 31;
*pixel = RGB2(grayValue, grayValue, grayValue);
}
}
}
}
static void ApplyImageEffect_RedChannelGrayscaleHighlight(u8 highlight)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
{
u8 grayValue = (*pixel & RGB_RED);
if (grayValue > 31 - highlight)
grayValue = 31 - (highlight >> 1);
*pixel = RGB2(grayValue, grayValue, grayValue);
}
}
}
}
static void ApplyImageEffect_Pointillism(void)
{
u32 i;
for (i = 0; i < ARRAY_COUNT(sPointillismPoints); i++)
AddPointillismPoints(i);
}
static void ApplyImageEffect_Grayscale(void)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
*pixel = ConvertColorToGrayscale(pixel);
}
}
}
static void ApplyImageEffect_Blur(void)
{
u8 i, j;
for (i = 0; i < gCanvasColumnEnd; i++)
{
u16 *pixelRow = &gCanvasPixels[gCanvasRowStart * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart + i];
u16 prevPixel = *pixel;
j = 1;
pixel += gCanvasWidth;
while (j < gCanvasRowEnd - 1)
{
if (!IS_ALPHA(*pixel))
{
*pixel = QuantizePixel_Blur(&prevPixel, pixel, pixel + gCanvasWidth);
prevPixel = *pixel;
}
j++;
pixel += gCanvasWidth;
}
}
}
static void ApplyImageEffect_PersonalityColor(u8 personality)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
*pixel = QuantizePixel_PersonalityColor(pixel, personality);
}
}
}
static void ApplyImageEffect_BlackAndWhite(void)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
*pixel = QuantizePixel_BlackAndWhite(pixel);
}
}
}
static void ApplyImageEffect_BlackOutline(void)
{
u8 i, j;
u16 *pixel;
// Handle top row of pixels first.
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
pixel = &pixelRow[gCanvasColumnStart];
*pixel = QuantizePixel_BlackOutline(pixel, pixel + 1);
for (i = 1, pixel++; i < gCanvasColumnEnd - 1; i++, pixel++)
{
*pixel = QuantizePixel_BlackOutline(pixel, pixel + 1);
*pixel = QuantizePixel_BlackOutline(pixel, pixel - 1);
}
*pixel = QuantizePixel_BlackOutline(pixel, pixel - 1);
}
// Handle each column from left to right.
for (i = 0; i < gCanvasColumnEnd; i++)
{
u16 *pixelRow = &gCanvasPixels[gCanvasRowStart * gCanvasWidth];
pixel = &pixelRow[gCanvasColumnStart + i];
*pixel = QuantizePixel_BlackOutline(pixel, pixel + gCanvasWidth);
for (j = 1, pixel += gCanvasWidth; j < gCanvasRowEnd - 1; j++, pixel += gCanvasWidth)
{
*pixel = QuantizePixel_BlackOutline(pixel, pixel + gCanvasWidth);
*pixel = QuantizePixel_BlackOutline(pixel, pixel - gCanvasWidth);
}
*pixel = QuantizePixel_BlackOutline(pixel, pixel - gCanvasWidth);
}
}
static void ApplyImageEffect_Invert(void)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
*pixel = QuantizePixel_Invert(pixel);
}
}
}
static void ApplyImageEffect_Shimmer(void)
{
u8 i, j;
u16 *pixel;
u16 prevPixel;
// First, invert all of the colors.
pixel = gCanvasPixels;
for (i = 0; i < MAX_DIMENSION; i++)
{
for (j = 0; j < MAX_DIMENSION; j++, pixel++)
{
if (!IS_ALPHA(*pixel))
*pixel = QuantizePixel_Invert(pixel);
}
}
// Blur the pixels twice.
for (j = 0; j < MAX_DIMENSION; j++)
{
pixel = &gCanvasPixels[j];
prevPixel = *pixel;
*pixel = RGB_ALPHA;
for (i = 1, pixel += MAX_DIMENSION; i < MAX_DIMENSION - 1; i++, pixel += MAX_DIMENSION)
{
if (!IS_ALPHA(*pixel))
{
*pixel = QuantizePixel_BlurHard(&prevPixel, pixel, pixel + MAX_DIMENSION);
prevPixel = *pixel;
}
}
*pixel = RGB_ALPHA;
pixel = &gCanvasPixels[j];
prevPixel = *pixel;
*pixel = RGB_ALPHA;
for (i = 1, pixel += MAX_DIMENSION; i < MAX_DIMENSION - 1; i++, pixel += MAX_DIMENSION)
{
if (!IS_ALPHA(*pixel))
{
*pixel = QuantizePixel_BlurHard(&prevPixel, pixel, pixel + MAX_DIMENSION);
prevPixel = *pixel;
}
}
*pixel = RGB_ALPHA;
}
// Finally, invert colors back to the original color space.
// The above blur causes the outline areas to darken, which makes
// this inversion give the effect of light outlines.
pixel = gCanvasPixels;
for (i = 0; i < MAX_DIMENSION; i++)
{
for (j = 0; j < MAX_DIMENSION; j++, pixel++)
{
if (!IS_ALPHA(*pixel))
*pixel = QuantizePixel_Invert(pixel);
}
}
}
static void ApplyImageEffect_BlurRight(void)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
u16 prevPixel = *pixel;
for (i = 1, pixel++; i < gCanvasColumnEnd - 1; i++, pixel++)
{
if (!IS_ALPHA(*pixel))
{
*pixel = QuantizePixel_MotionBlur(&prevPixel, pixel);
prevPixel = *pixel;
}
}
}
}
static void ApplyImageEffect_BlurDown(void)
{
u8 i, j;
for (i = 0; i < gCanvasColumnEnd; i++)
{
u16 *pixelRow = &gCanvasPixels[gCanvasRowStart * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart + i];
u16 prevPixel = *pixel;
for (j = 1, pixel += gCanvasWidth; j < gCanvasRowEnd - 1; j++, pixel += gCanvasWidth)
{
if (!IS_ALPHA(*pixel))
{
*pixel = QuantizePixel_MotionBlur(&prevPixel, pixel);
prevPixel = *pixel;
}
}
}
}
struct PointillismPoint
{
u8 column;
u8 row;
u16 delta;
};
static void AddPointillismPoints(u16 point)
{
u8 i;
bool8 offsetDownLeft;
u8 colorType;
struct PointillismPoint points[6];
points[0].column = sPointillismPoints[point][0];
points[0].row = sPointillismPoints[point][1];
points[0].delta = GET_POINT_DELTA(sPointillismPoints[point][2]);
colorType = GET_POINT_COLOR_TYPE(sPointillismPoints[point][2]);
offsetDownLeft = GET_POINT_OFFSET_DL(sPointillismPoints[point][2]);
for (i = 1; i < points[0].delta; i++)
{
if (!offsetDownLeft)
{
points[i].column = points[0].column - i;
points[i].row = points[0].row + i;
}
else
{
points[i].column = points[0].column + 1;
points[i].row = points[0].row - 1;
}
if (points[i].column >= MAX_DIMENSION || points[i].row >= MAX_DIMENSION)
{
points[0].delta = i - 1;
break;
}
points[i].delta = points[0].delta - i;
}
for (i = 0; i < points[0].delta; i++)
{
u16 *pixel = &gCanvasPixels[points[i].row * MAX_DIMENSION] + points[i].column;
if (!IS_ALPHA(*pixel))
{
u16 red = GET_R(*pixel);
u16 green = GET_G(*pixel);
u16 blue = GET_B(*pixel);
switch (colorType)
{
case 0:
case 1:
switch (GET_POINT_DELTA(sPointillismPoints[point][2]) % 3)
{
case 0:
if (red >= points[i].delta)
red -= points[i].delta;
else
red = 0;
break;
case 1:
if (green >= points[i].delta)
green -= points[i].delta;
else
green = 0;
break;
case 2:
if (blue >= points[i].delta)
blue -= points[i].delta;
else
blue = 0;
break;
}
break;
case 2:
case 3:
red += points[i].delta;
green += points[i].delta;
blue += points[i].delta;
if (red > 31)
red = 31;
if (green > 31)
green = 31;
if (blue > 31)
blue = 31;
break;
}
*pixel = RGB2(red, green, blue);
}
}
}
static u16 ConvertColorToGrayscale(u16 *color)
{
s32 clr = *color;
s32 r = GET_R(clr);
s32 g = GET_G(clr);
s32 b = GET_B(clr);
s32 gray = (r * Q_8_8(0.3) + g * Q_8_8(0.59) + b * Q_8_8(0.1133)) >> 8;
return RGB2(gray, gray, gray);
}
// The dark colors are the colored edges of the Cool painting effect.
// Everything else is white.
static u16 QuantizePixel_PersonalityColor(u16 *color, u8 personality)
{
u16 red = GET_R(*color);
u16 green = GET_G(*color);
u16 blue = GET_B(*color);
if (red < 17 && green < 17 && blue < 17)
return GetColorFromPersonality(personality);
else
return RGB_WHITE;
}
// Based on the given value, which comes from the first 8 bits of
// the mon's personality value, return a color.
static u16 GetColorFromPersonality(u8 personality)
{
u16 red = 0;
u16 green = 0;
u16 blue = 0;
u8 strength = (personality / 6) % 3;
u8 colorType = personality % 6;
switch (colorType)
{
case 0:
// Teal color
green = 21 - strength;
blue = green;
red = 0;
break;
case 1:
// Yellow color
blue = 0;
red = 21 - strength;
green = red;
break;
case 2:
// Purple color
blue = 21 - strength;
green = 0;
red = blue;
break;
case 3:
// Red color
blue = 0;
green = 0;
red = 23 - strength;
break;
case 4:
// Blue color
blue = 23 - strength;
green = 0;
red = 0;
break;
case 5:
// Green color
blue = 0;
green = 23 - strength;
red = 0;
break;
}
return RGB2(red, green, blue);
}
static u16 QuantizePixel_BlackAndWhite(u16 *color)
{
u16 red = GET_R(*color);
u16 green = GET_G(*color);
u16 blue = GET_B(*color);
if (red < 17 && green < 17 && blue < 17)
return RGB_BLACK;
else
return RGB_WHITE;
}
static u16 QuantizePixel_BlackOutline(u16 *pixelA, u16 *pixelB)
{
if (*pixelA != RGB_BLACK)
{
if (IS_ALPHA(*pixelA))
return RGB_ALPHA;
if (IS_ALPHA(*pixelB))
return RGB_BLACK;
return *pixelA;
}
return RGB_BLACK;
}
static u16 QuantizePixel_Invert(u16 *color)
{
u16 red = GET_R(*color);
u16 green = GET_G(*color);
u16 blue = GET_B(*color);
red = 31 - red;
green = 31 - green;
blue = 31 - blue;
return RGB2(red, green, blue);
}
static u16 QuantizePixel_MotionBlur(u16 *prevPixel, u16 *curPixel)
{
u16 pixelChannels[2][3];
u16 diffs[3];
u8 i;
u16 largestDiff;
u16 red, green, blue;
if (*prevPixel == *curPixel)
return *curPixel;
pixelChannels[0][0] = GET_R(*prevPixel);
pixelChannels[0][1] = GET_G(*prevPixel);
pixelChannels[0][2] = GET_B(*prevPixel);
pixelChannels[1][0] = GET_R(*curPixel);
pixelChannels[1][1] = GET_G(*curPixel);
pixelChannels[1][2] = GET_B(*curPixel);
// Don't blur light colors.
if (pixelChannels[0][0] > 25 && pixelChannels[0][1] > 25 && pixelChannels[0][2] > 25)
return *curPixel;
if (pixelChannels[1][0] > 25 && pixelChannels[1][1] > 25 && pixelChannels[1][2] > 25)
return *curPixel;
for (i = 0; i < 3; i++)
{
if (pixelChannels[0][i] > pixelChannels[1][i])
diffs[i] = pixelChannels[0][i] - pixelChannels[1][i];
else
diffs[i] = pixelChannels[1][i] - pixelChannels[0][i];
}
// Find the largest diff of any of the color channels.
if (diffs[0] >= diffs[1])
{
if (diffs[0] >= diffs[2])
largestDiff = diffs[0];
else if (diffs[1] >= diffs[2])
largestDiff = diffs[1];
else
largestDiff = diffs[2];
}
else
{
if (diffs[1] >= diffs[2])
largestDiff = diffs[1];
else if (diffs[2] >= diffs[0])
largestDiff = diffs[2];
else
largestDiff = diffs[0];
}
red = (pixelChannels[1][0] * (31 - largestDiff / 2)) / 31;
green = (pixelChannels[1][1] * (31 - largestDiff / 2)) / 31;
blue = (pixelChannels[1][2] * (31 - largestDiff / 2)) / 31;
return RGB2(red, green, blue);
}
static u16 QuantizePixel_Blur(u16 *prevPixel, u16 *curPixel, u16 *nextPixel)
{
u16 red, green, blue;
u16 prevAvg, curAvg, nextAvg;
u16 prevDiff, nextDiff;
u32 diff;
u16 factor;
if (*prevPixel == *curPixel && *nextPixel == *curPixel)
return *curPixel;
red = GET_R(*curPixel);
green = GET_G(*curPixel);
blue = GET_B(*curPixel);
prevAvg = (GET_R(*prevPixel) + GET_G(*prevPixel) + GET_B(*prevPixel)) / 3;
curAvg = (GET_R(*curPixel) + GET_G(*curPixel) + GET_B(*curPixel)) / 3;
nextAvg = (GET_R(*nextPixel) + GET_G(*nextPixel) + GET_B(*nextPixel)) / 3;
if (prevAvg == curAvg && nextAvg == curAvg)
return *curPixel;
if (prevAvg > curAvg)
prevDiff = prevAvg - curAvg;
else
prevDiff = curAvg - prevAvg;
if (nextAvg > curAvg)
nextDiff = nextAvg - curAvg;
else
nextDiff = curAvg - nextAvg;
if (prevDiff >= nextDiff)
diff = prevDiff;
else
diff = nextDiff;
factor = 31 - diff / 2;
red = (red * factor) / 31;
green = (green * factor) / 31;
blue = (blue * factor) / 31;
return RGB2(red, green, blue);
}
static u16 QuantizePixel_BlurHard(u16 *prevPixel, u16 *curPixel, u16 *nextPixel)
{
u16 red, green, blue;
u16 prevAvg, curAvg, nextAvg;
u16 prevDiff, nextDiff;
u32 diff;
u16 factor;
if (*prevPixel == *curPixel && *nextPixel == *curPixel)
return *curPixel;
red = GET_R(*curPixel);
green = GET_G(*curPixel);
blue = GET_B(*curPixel);
prevAvg = (GET_R(*prevPixel) + GET_G(*prevPixel) + GET_B(*prevPixel)) / 3;
curAvg = (GET_R(*curPixel) + GET_G(*curPixel) + GET_B(*curPixel)) / 3;
nextAvg = (GET_R(*nextPixel) + GET_G(*nextPixel) + GET_B(*nextPixel)) / 3;
if (prevAvg == curAvg && nextAvg == curAvg)
return *curPixel;
if (prevAvg > curAvg)
prevDiff = prevAvg - curAvg;
else
prevDiff = curAvg - prevAvg;
if (nextAvg > curAvg)
nextDiff = nextAvg - curAvg;
else
nextDiff = curAvg - nextAvg;
if (prevDiff >= nextDiff)
diff = prevDiff;
else
diff = nextDiff;
factor = 31 - diff;
red = (red * factor) / 31;
green = (green * factor) / 31;
blue = (blue * factor) / 31;
return RGB2(red, green, blue);
}
void ConvertImageProcessingToGBA(struct ImageProcessingContext *context)
{
u16 i, j, k;
u16 *src, *dest, *src_, *dest_;
u16 width, height;
width = context->canvasWidth >> 3;
height = context->canvasHeight >> 3;
src_ = context->canvasPixels;
dest_ = context->dest;
if (context->var_16 == 2)
{
for (i = 0; i < height; i++)
{
for (j = 0; j < width; j++)
{
for (k = 0; k < 8; k++)
{
dest = dest_ + ((i * width + j) << 5) + (k << 2);
src = src_ + ((((i << 3) + k) << 3) * width) + (j << 3);
dest[0] = src[0] | (src[1] << 8);
dest[1] = src[2] | (src[3] << 8);
dest[2] = src[4] | (src[5] << 8);
dest[3] = src[6] | (src[7] << 8);
}
}
}
}
else
{
for (i = 0; i < height; i++)
{
for (j = 0; j < width; j++)
{
for (k = 0; k < 8; k++)
{
dest = dest_ + ((i * width + j) << 4) + (k << 1);
src = src_ + ((((i << 3) + k) << 3) * width) + (j << 3);
dest[0] = src[0] | (src[1] << 4) | (src[2] << 8) | (src[3] << 12);
dest[1] = src[4] | (src[5] << 4) | (src[6] << 8) | (src[7] << 12);
}
}
}
}
}
void ApplyImageProcessingQuantization(struct ImageProcessingContext *context)
{
gCanvasPaletteStart = context->paletteStart * 16;
gCanvasPalette = &context->canvasPalette[gCanvasPaletteStart];
gCanvasPixels = context->canvasPixels;
gCanvasColumnStart = context->columnStart;
gCanvasRowStart = context->rowStart;
gCanvasColumnEnd = context->columnEnd;
gCanvasRowEnd = context->rowEnd;
gCanvasWidth = context->canvasWidth;
gCanvasHeight = context->canvasHeight;
switch (context->quantizeEffect)
{
case QUANTIZE_EFFECT_STANDARD:
QuantizePalette_Standard(FALSE);
break;
case QUANTIZE_EFFECT_STANDARD_LIMITED_COLORS:
QuantizePalette_Standard(TRUE);
break;
case QUANTIZE_EFFECT_PRIMARY_COLORS:
SetPresetPalette_PrimaryColors();
QuantizePalette_PrimaryColors();
break;
case QUANTIZE_EFFECT_GRAYSCALE:
SetPresetPalette_Grayscale();
QuantizePalette_Grayscale();
break;
case QUANTIZE_EFFECT_GRAYSCALE_SMALL:
SetPresetPalette_GrayscaleSmall();
QuantizePalette_GrayscaleSmall();
break;
case QUANTIZE_EFFECT_BLACK_WHITE:
SetPresetPalette_BlackAndWhite();
QuantizePalette_BlackAndWhite();
break;
}
}
static void SetPresetPalette_PrimaryColors(void)
{
gCanvasPalette[0] = RGB_BLACK;
gCanvasPalette[1] = RGB(6, 6, 6);
gCanvasPalette[2] = RGB(29, 29, 29);
gCanvasPalette[3] = RGB(11, 11, 11);
gCanvasPalette[4] = RGB(29, 6, 6);
gCanvasPalette[5] = RGB(6, 29, 6);
gCanvasPalette[6] = RGB(6, 6, 29);
gCanvasPalette[7] = RGB(29, 29, 6);
gCanvasPalette[8] = RGB(29, 6, 29);
gCanvasPalette[9] = RGB(6, 29, 29);
gCanvasPalette[10] = RGB(29, 11, 6);
gCanvasPalette[11] = RGB(11, 29, 6);
gCanvasPalette[12] = RGB(6, 11, 29);
gCanvasPalette[13] = RGB(29, 6, 11);
gCanvasPalette[14] = RGB(6, 29, 11);
gCanvasPalette[15] = RGB(11, 6, 29);
}
static void SetPresetPalette_BlackAndWhite(void)
{
gCanvasPalette[0] = RGB_BLACK;
gCanvasPalette[1] = RGB_BLACK;
gCanvasPalette[2] = RGB_WHITE;
}
static void SetPresetPalette_GrayscaleSmall(void)
{
u8 i;
gCanvasPalette[0] = RGB_BLACK;
gCanvasPalette[1] = RGB_BLACK;
for (i = 0; i < 14; i++)
gCanvasPalette[i + 2] = RGB2(2 * (i + 2), 2 * (i + 2), 2 * (i + 2));
}
static void SetPresetPalette_Grayscale(void)
{
u8 i;
gCanvasPalette[0] = RGB_BLACK;
for (i = 0; i < 32; i++)
gCanvasPalette[i + 1] = RGB2(i, i, i);
}
static void QuantizePalette_Standard(bool8 useLimitedPalette)
{
u8 i, j;
u16 maxIndex;
maxIndex = 0xDF;
if (!useLimitedPalette)
maxIndex = 0xFF;
for (i = 0; i < maxIndex; i++)
gCanvasPalette[i] = RGB_BLACK;
gCanvasPalette[maxIndex] = RGB2(15, 15, 15);
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (IS_ALPHA(*pixel))
{
*pixel = gCanvasPaletteStart;
}
else
{
u16 quantizedColor = QuantizePixel_Standard(pixel);
u8 curIndex = 1;
if (curIndex < maxIndex)
{
if (gCanvasPalette[curIndex] == RGB_BLACK)
{
// The quantized color does not match any existing color in the
// palette, so we add it to the palette.
// This if block seems pointless because the below while loop handles
// this same logic.
gCanvasPalette[curIndex] = quantizedColor;
*pixel = gCanvasPaletteStart + curIndex;
}
else
{
while (curIndex < maxIndex)
{
if (gCanvasPalette[curIndex] == RGB_BLACK)
{
// The quantized color does not match any existing color in the
// palette, so we add it to the palette.
gCanvasPalette[curIndex] = quantizedColor;
*pixel = gCanvasPaletteStart + curIndex;
break;
}
if (gCanvasPalette[curIndex] == quantizedColor)
{
// The quantized color matches this existing color in the
// palette, so we use this existing color for the pixel.
*pixel = gCanvasPaletteStart + curIndex;
break;
}
curIndex++;
}
}
}
if (curIndex == maxIndex)
{
// The entire palette's colors are already in use, which means
// the base image has too many colors to handle. This error is handled
// by marking such pixels as gray color.
curIndex = maxIndex;
*pixel = curIndex;
}
}
}
}
}
static void QuantizePalette_BlackAndWhite(void)
{
u8 i, j;
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
if (IS_ALPHA(*pixel))
{
*pixel = gCanvasPaletteStart;
}
else
{
if (QuantizePixel_BlackAndWhite(pixel) == RGB_BLACK)
{
// Black is the first color in the quantized palette.
*pixel = gCanvasPaletteStart + 1;
}
else
{
// White is the second color in the quantized palette.