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Fix SRCALPHA TGA image saving #3432

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Fix SRCALPHA TGA image saving #3432

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20 changes: 10 additions & 10 deletions src_c/image.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1690,7 +1690,7 @@ SaveTGA_RW(SDL_Surface *surface, SDL_RWops *out, int rle)
int alpha = 0;
struct TGAheader h;
int srcbpp;
Uint8 surf_alpha;
SDL_BlendMode surf_blendmode;
int have_surf_colorkey = 0;
Uint32 surf_colorkey;
SDL_Rect r;
Expand Down Expand Up @@ -1721,7 +1721,10 @@ SaveTGA_RW(SDL_Surface *surface, SDL_RWops *out, int rle)
SDL_PixelFormatEnum output_format;
#endif

SDL_GetSurfaceAlphaMod(surface, &surf_alpha);
if (!PG_GetSurfaceBlendMode(surface, &surf_blendmode)) {
return -1;
}

if ((have_surf_colorkey = SDL_HasColorKey(surface))) {
SDL_GetColorKey(surface, &surf_colorkey);
}
Expand Down Expand Up @@ -1811,11 +1814,9 @@ SaveTGA_RW(SDL_Surface *surface, SDL_RWops *out, int rle)
}
}

/* Temporarily remove colorkey and alpha from surface so copies are
opaque */
SDL_SetSurfaceAlphaMod(surface, SDL_ALPHA_OPAQUE);
if (have_surf_colorkey) {
SDL_SetColorKey(surface, SDL_FALSE, surf_colorkey);
/* Temporarily set SDL_BLENDMODE_NONE so that copies are opaque */
if (!PG_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE)) {
goto error;
}

r.x = 0;
Expand Down Expand Up @@ -1847,9 +1848,8 @@ SaveTGA_RW(SDL_Surface *surface, SDL_RWops *out, int rle)
}

/* restore flags */
SDL_SetSurfaceAlphaMod(surface, surf_alpha);
if (have_surf_colorkey) {
SDL_SetColorKey(surface, SDL_TRUE, surf_colorkey);
if (!PG_SetSurfaceBlendMode(surface, surf_blendmode)) {
goto error;
}

free(rlebuf);
Expand Down
34 changes: 34 additions & 0 deletions test/image_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import io
import os
import pathlib
import random
import tempfile
import unittest
from concurrent.futures import ThreadPoolExecutor
Expand Down Expand Up @@ -414,6 +415,39 @@ def test_save_tga(self):
# clean up the temp file, even if test fails
os.remove(temp_filename)

def test_save_tga_srcalpha(self):
WIDTH = 10
HEIGHT = 10
s = pygame.Surface((WIDTH, HEIGHT), pygame.SRCALPHA)
pixels = [
[
(
random.randint(0, 255),
random.randint(0, 255),
random.randint(0, 255),
random.randint(0, 255),
)
for _ in range(WIDTH)
]
for _ in range(HEIGHT)
]
for y in range(HEIGHT):
for x in range(WIDTH):
s.set_at((x, y), pixels[y][x])

with tempfile.NamedTemporaryFile(suffix=".tga", delete=False) as f:
temp_filename = f.name

try:
pygame.image.save(s, temp_filename)
s2 = pygame.image.load(temp_filename)
for y in range(HEIGHT):
for x in range(WIDTH):
self.assertEqual(s2.get_at((x, y)), pixels[y][x])
finally:
# clean up the temp file, even if test fails
os.remove(temp_filename)

def test_save_pathlib(self):
surf = pygame.Surface((1, 1))
surf.fill((23, 23, 23))
Expand Down
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