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riscos: Fix enumerating screen modes

This commit is contained in:
Cameron Cawley 2021-10-26 13:42:34 +01:00 committed by Sam Lantinga
parent 5a3c97f3a3
commit 1c256b892e
1 changed files with 52 additions and 16 deletions
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68
src/video/riscos/SDL_riscosmodes.c
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@ -86,7 +86,7 @@ RISCOS_ModeToPixelFormat(int ncolour, int modeflags, int log2bpp)
static size_t
measure_mode_block(const int *block)
{
size_t blockSize = (block[0] == 2) ? 7 : 5;
size_t blockSize = ((block[0] & 0xFF) == 3) ? 7 : 5;
while(block[blockSize] != -1) {
blockSize += 2;
}
@ -105,18 +105,16 @@ read_mode_variable(int *block, int var)
return regs.r[2];
}
static int *
static SDL_bool
read_mode_block(int *block, SDL_DisplayMode *mode, SDL_bool extended)
{
int xres, yres, ncolour, modeflags, log2bpp, rate;
int *end;
if ((block[0] & 0xFF) == 1) {
xres = block[1];
yres = block[2];
log2bpp = block[3];
rate = block[4];
end = block + 5;
ncolour = (1 << (1 << log2bpp)) - 1;
modeflags = MODE_FLAG_TBGR;
} else if ((block[0] & 0xFF) == 3) {
@ -126,16 +124,14 @@ read_mode_block(int *block, SDL_DisplayMode *mode, SDL_bool extended)
modeflags = block[4];
log2bpp = block[5];
rate = block[6];
end = block + 7;
} else {
return NULL;
return SDL_FALSE;
}
if (extended) {
xres = read_mode_variable(block, 11) + 1;
yres = read_mode_variable(block, 12) + 1;
log2bpp = read_mode_variable(block, 9);
end = block + (measure_mode_block(block) / 4);
ncolour = read_mode_variable(block, 3);
modeflags = read_mode_variable(block, 0);
}
@ -145,7 +141,53 @@ read_mode_block(int *block, SDL_DisplayMode *mode, SDL_bool extended)
mode->format = RISCOS_ModeToPixelFormat(ncolour, modeflags, log2bpp);
mode->refresh_rate = rate;
return end;
return SDL_TRUE;
}
static void *
convert_mode_block(const int *block)
{
int xres, yres, log2bpp, rate, ncolour = 0, modeflags = 0;
size_t pos = 0;
int *dst;
if ((block[0] & 0xFF) == 1) {
xres = block[1];
yres = block[2];
log2bpp = block[3];
rate = block[4];
} else if ((block[0] & 0xFF) == 3) {
xres = block[1];
yres = block[2];
ncolour = block[3];
modeflags = block[4];
log2bpp = block[5];
rate = block[6];
} else {
return NULL;
}
dst = SDL_malloc(40);
if (!dst) {
return NULL;
}
dst[pos++] = 1;
dst[pos++] = xres;
dst[pos++] = yres;
dst[pos++] = log2bpp;
dst[pos++] = rate;
if (ncolour != 0) {
dst[pos++] = 3;
dst[pos++] = ncolour;
}
if (modeflags != 0) {
dst[pos++] = 0;
dst[pos++] = modeflags;
}
dst[pos++] = -1;
return dst;
}
static void *
@ -221,24 +263,18 @@ RISCOS_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
}
for (pos = block; pos < (void *)regs.r[6]; pos += *((int *)pos)) {
size_t size;
void *end;
end = read_mode_block(pos + 4, &mode, SDL_FALSE);
if (!end) {
if (!read_mode_block(pos + 4, &mode, SDL_FALSE)) {
continue;
}
if (mode.format == SDL_PIXELFORMAT_UNKNOWN)
continue;
size = (end - pos) - 4;
mode.driverdata = copy_memory(pos + 4, size, size + 4);
mode.driverdata = convert_mode_block(pos + 4);
if (!mode.driverdata) {
SDL_OutOfMemory();
break;
}
*((int *)(mode.driverdata + size)) = -1;
if (!SDL_AddDisplayMode(display, &mode)) {
SDL_free(mode.driverdata);