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Add TRY_DRAW_SPOT_PIXEL #2055

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Nov 20, 2024
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Add TRY_DRAW_SPOT_PIXEL #2055

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32 changes: 17 additions & 15 deletions src/pokemon.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5684,7 +5684,7 @@ u16 SpeciesToCryId(u16 species)
// To draw a spot pixel, add 4 to the color index
#define SPOT_COLOR_ADJUSTMENT 4
/*
The macro below handles drawing the randomly-placed spots on Spinda's front sprite.
The macros below handle drawing the randomly-placed spots on Spinda's front sprite.
Spinda has 4 spots, each with an entry in gSpindaSpotGraphics. Each entry contains
a base x and y coordinate for the spot and a 16x16 binary image. Each bit in the image
determines whether that pixel should be considered part of the spot.
Expand All @@ -5696,18 +5696,26 @@ u16 SpeciesToCryId(u16 species)
coordinate is calculated as (baseCoord + (given 4 bits of personality) - 8). In effect this
means each spot can start at any position -8 to +7 off of its base coordinates (256 possibilities).

The macro then loops over the 16x16 spot image. For each bit in the spot's binary image, if
DRAW_SPINDA_SPOTS loops over the 16x16 spot image. For each bit in the spot's binary image, if
the bit is set then it's part of the spot; try to draw it. A pixel is drawn on Spinda if the
pixel on Spinda satisfies the following formula: ((u8)(colorIndex - 1) <= 2). The -1 excludes
transparent pixels, as these are index 0. Therefore only colors 1, 2, or 3 on Spinda will
allow a spot to be drawn. These color indexes are Spinda's light brown body colors. To create
pixel is between FIRST_SPOT_COLOR and LAST_SPOT_COLOR (so only colors 1, 2, or 3 on Spinda will
allow a spot to be drawn). These color indexes are Spinda's light brown body colors. To create
the spot it adds 4 to the color index, so Spinda's spots will be colors 5, 6, and 7.

The above is done two different ways in the macro: one with << 4, and one without. This
is because Spinda's sprite is a 4 bits per pixel image, but the pointer to Spinda's pixels
The above is done in TRY_DRAW_SPOT_PIXEL two different ways: one with << 4, and one without.
This is because Spinda's sprite is a 4 bits per pixel image, but the pointer to Spinda's pixels
(destPixels) is an 8 bit pointer, so it addresses two pixels. Shifting by 4 accesses the 2nd
of these pixels, so this is done every other time.
*/

// Draw spot pixel if this is Spinda's body color
#define TRY_DRAW_SPOT_PIXEL(pixels, shift) \
if (((*(pixels) & (0xF << (shift))) >= (FIRST_SPOT_COLOR << (shift))) \
&& ((*(pixels) & (0xF << (shift))) <= (LAST_SPOT_COLOR << (shift)))) \
{ \
*(pixels) += (SPOT_COLOR_ADJUSTMENT << (shift)); \
}

#define DRAW_SPINDA_SPOTS(personality, dest) \
{ \
s32 i; \
Expand Down Expand Up @@ -5737,17 +5745,11 @@ u16 SpeciesToCryId(u16 species)
/* of the two pixels is being considered for drawing */ \
if (column & 1) \
{ \
/* Draw spot pixel if this is Spinda's body color */ \
if ((u8)((*destPixels & 0xF0) - (FIRST_SPOT_COLOR << 4))\
<= ((LAST_SPOT_COLOR - FIRST_SPOT_COLOR) << 4))\
*destPixels += (SPOT_COLOR_ADJUSTMENT << 4); \
TRY_DRAW_SPOT_PIXEL(destPixels, 4); \
} \
else \
{ \
/* Draw spot pixel if this is Spinda's body color */ \
if ((u8)((*destPixels & 0xF) - FIRST_SPOT_COLOR) \
<= (LAST_SPOT_COLOR - FIRST_SPOT_COLOR)) \
*destPixels += SPOT_COLOR_ADJUSTMENT; \
TRY_DRAW_SPOT_PIXEL(destPixels, 0); \
} \
} \
\
Expand Down