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GBA e-Reader: Improve initial boundary detection

This commit is contained in:
Vicki Pfau 2021-04-11 16:03:14 -07:00
parent e84db73f31
commit 92080793b3
1 changed files with 15 additions and 6 deletions
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21
src/gba/cart/ereader.c
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@ -1237,15 +1237,14 @@ void EReaderScanDetectBlockThreshold(struct EReaderScan* scan, int blockId) {
return; return;
} }
struct EReaderBlock* block = EReaderBlockListGetPointer(&scan->blocks, blockId); struct EReaderBlock* block = EReaderBlockListGetPointer(&scan->blocks, blockId);
unsigned histograms[0xFC] = {0}; unsigned histograms[0xF8] = {0};
unsigned* histogram[] = { unsigned* histogram[] = {
block->histogram, block->histogram,
&histograms[0x00], &histograms[0x00],
&histograms[0x80], &histograms[0x80],
&histograms[0xC0], &histograms[0xC0],
&histograms[0xE0], &histograms[0xE0],
&histograms[0xF0], &histograms[0xF0]
&histograms[0xF8]
}; };
size_t i; size_t i;
@ -1256,11 +1255,21 @@ void EReaderScanDetectBlockThreshold(struct EReaderScan* scan, int blockId) {
histogram[3][i >> 3] += baseline; histogram[3][i >> 3] += baseline;
histogram[4][i >> 4] += baseline; histogram[4][i >> 4] += baseline;
histogram[5][i >> 5] += baseline; histogram[5][i >> 5] += baseline;
histogram[6][i >> 6] += baseline;
} }
int offset = 1; int offset;
for (i = 7; i--; offset *= 2) { for (offset = 0; offset < 7; ++offset) {
if (histogram[5][offset] > histogram[5][offset + 1]) {
break;
}
}
for (; offset < 7; ++offset) {
if (histogram[5][offset] < histogram[5][offset + 1]) {
break;
}
}
for (i = 6; i--; offset *= 2) {
if (histogram[i][offset] > histogram[i][offset + 1]) { if (histogram[i][offset] > histogram[i][offset + 1]) {
++offset; ++offset;
} }