This commit is contained in:
disinvite 2024-12-16 23:52:30 -05:00
parent 5f9cf3c51f
commit 77f315dff7

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@ -603,14 +603,14 @@ void MxDisplaySurface::DrawTransparentRLE(
3. Repeat until the end of p_bitmapData is reached. */ 3. Repeat until the end of p_bitmapData is reached. */
MxU8* end = p_bitmapData + p_bitmapSize; MxU8* end = p_bitmapData + p_bitmapSize;
MxU8* surf_copy = p_surfaceData; // unused? MxU8* surfCopy = p_surfaceData; // unused?
// The total number of pixels drawn or skipped // The total number of pixels drawn or skipped
MxU32 count = 0; MxU32 count = 0;
// Used in both 8 and 16 bit branches // Used in both 8 and 16 bit branches
MxU32 n_skip; MxU32 skipCount;
MxU32 n_draw; MxU32 drawCount;
MxU32 t; MxU32 t;
if (p_bpp == 16) { if (p_bpp == 16) {
@ -619,47 +619,47 @@ void MxDisplaySurface::DrawTransparentRLE(
} }
while (p_bitmapData < end) { while (p_bitmapData < end) {
n_skip = *p_bitmapData++; skipCount = *p_bitmapData++;
t = *p_bitmapData++; t = *p_bitmapData++;
n_skip += t << 8; skipCount += t << 8;
t = *p_bitmapData++; t = *p_bitmapData++;
n_skip += t << 16; skipCount += t << 16;
MxS32 row_remainder = p_width - count % p_width; MxS32 rowRemainder = p_width - count % p_width;
count += n_skip; count += skipCount;
if (n_skip >= row_remainder) { if (skipCount >= rowRemainder) {
p_surfaceData += row_remainder; // skip the rest of this row p_surfaceData += rowRemainder; // skip the rest of this row
n_skip -= row_remainder; skipCount -= rowRemainder;
p_surfaceData += p_pitch - p_width; // seek to start of next row p_surfaceData += p_pitch - p_width; // seek to start of next row
p_surfaceData += p_pitch * (n_skip / p_width); // skip entire rows if any p_surfaceData += p_pitch * (skipCount / p_width); // skip entire rows if any
} }
// skip any pixels at the start of this row // skip any pixels at the start of this row
p_surfaceData += n_skip % p_width; p_surfaceData += skipCount % p_width;
if (p_bitmapData >= end) { if (p_bitmapData >= end) {
break; break;
} }
n_draw = *p_bitmapData++; drawCount = *p_bitmapData++;
t = *p_bitmapData++; t = *p_bitmapData++;
n_draw += t << 8; drawCount += t << 8;
t = *p_bitmapData++; t = *p_bitmapData++;
n_draw += t << 16; drawCount += t << 16;
row_remainder = p_width - count % p_width; rowRemainder = p_width - count % p_width;
count += n_draw; count += drawCount;
if (n_draw >= row_remainder) { if (drawCount >= rowRemainder) {
memcpy(p_surfaceData, p_bitmapData, row_remainder); memcpy(p_surfaceData, p_bitmapData, rowRemainder);
p_surfaceData += row_remainder; p_surfaceData += rowRemainder;
p_bitmapData += row_remainder; p_bitmapData += rowRemainder;
n_draw -= row_remainder; drawCount -= rowRemainder;
// seek to start of bitmap on this screen row // seek to start of bitmap on this screen row
p_surfaceData += p_pitch - p_width; p_surfaceData += p_pitch - p_width;
MxS32 rows = n_draw / p_width; MxS32 rows = drawCount / p_width;
for (MxU32 i = 0; i < rows; i++) { for (MxU32 i = 0; i < rows; i++) {
memcpy(p_surfaceData, p_bitmapData, p_width); memcpy(p_surfaceData, p_bitmapData, p_width);
@ -668,7 +668,7 @@ void MxDisplaySurface::DrawTransparentRLE(
} }
} }
MxS32 tail = n_draw % p_width; MxS32 tail = drawCount % p_width;
memcpy(p_surfaceData, p_bitmapData, tail); memcpy(p_surfaceData, p_bitmapData, tail);
p_surfaceData += tail; p_surfaceData += tail;
p_bitmapData += tail; p_bitmapData += tail;
@ -677,47 +677,47 @@ void MxDisplaySurface::DrawTransparentRLE(
sixteen_bit: sixteen_bit:
while (p_bitmapData < end) { while (p_bitmapData < end) {
n_skip = *p_bitmapData++; skipCount = *p_bitmapData++;
t = *p_bitmapData++; t = *p_bitmapData++;
n_skip += t << 8; skipCount += t << 8;
t = *p_bitmapData++; t = *p_bitmapData++;
n_skip += t << 16; skipCount += t << 16;
MxS32 row_remainder = p_width - count % p_width; MxS32 rowRemainder = p_width - count % p_width;
count += n_skip; count += skipCount;
if (n_skip >= row_remainder) { if (skipCount >= rowRemainder) {
p_surfaceData += 2 * row_remainder; p_surfaceData += 2 * rowRemainder;
n_skip -= row_remainder; skipCount -= rowRemainder;
p_surfaceData += p_pitch - 2 * p_width; p_surfaceData += p_pitch - 2 * p_width;
p_surfaceData += p_pitch * (n_skip / p_width); p_surfaceData += p_pitch * (skipCount / p_width);
} }
p_surfaceData += 2 * (n_skip % p_width); p_surfaceData += 2 * (skipCount % p_width);
if (p_bitmapData >= end) { if (p_bitmapData >= end) {
break; break;
} }
n_draw = *p_bitmapData++; drawCount = *p_bitmapData++;
t = *p_bitmapData++; t = *p_bitmapData++;
n_draw += t << 8; drawCount += t << 8;
t = *p_bitmapData++; t = *p_bitmapData++;
n_draw += t << 16; drawCount += t << 16;
row_remainder = p_width - count % p_width; rowRemainder = p_width - count % p_width;
count += n_draw; count += drawCount;
if (n_draw >= row_remainder) { if (drawCount >= rowRemainder) {
// memcpy // memcpy
for (MxU32 j = 0; j < row_remainder; j++) { for (MxU32 j = 0; j < rowRemainder; j++) {
*((MxU16*) p_surfaceData) = m_16bitPal[*p_bitmapData++]; *((MxU16*) p_surfaceData) = m_16bitPal[*p_bitmapData++];
p_surfaceData += 2; p_surfaceData += 2;
} }
n_draw -= row_remainder; drawCount -= rowRemainder;
p_surfaceData += p_pitch - 2 * p_width; p_surfaceData += p_pitch - 2 * p_width;
MxS32 rows = n_draw / p_width; MxS32 rows = drawCount / p_width;
for (MxU32 i = 0; i < rows; i++) { for (MxU32 i = 0; i < rows; i++) {
// memcpy // memcpy
@ -730,7 +730,7 @@ void MxDisplaySurface::DrawTransparentRLE(
} }
} }
MxS32 tail = n_draw % p_width; MxS32 tail = drawCount % p_width;
// memcpy // memcpy
for (MxS32 j = 0; j < tail; j++) { for (MxS32 j = 0; j < tail; j++) {
*((MxU16*) p_surfaceData) = m_16bitPal[*p_bitmapData++]; *((MxU16*) p_surfaceData) = m_16bitPal[*p_bitmapData++];