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Merge pull request #68 from rakslice/misaligned_rows_fix

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Misaligned rows fix
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kanjitalk755 2020-11-18 12:05:52 +09:00 committed by GitHub
commit d547db0648
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3 changed files with 19 additions and 13 deletions
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16
BasiliskII/src/SDL/video_sdl2.cpp
View File

@ -2397,6 +2397,7 @@ static void update_display_static(driver_base *drv)
const VIDEO_MODE &mode = drv->mode; const VIDEO_MODE &mode = drv->mode;
int bytes_per_row = VIDEO_MODE_ROW_BYTES; int bytes_per_row = VIDEO_MODE_ROW_BYTES;
uint8 *p, *p2; uint8 *p, *p2;
uint32 x2_clipped, wide_clipped;
// Check for first line from top and first line from bottom that have changed // Check for first line from top and first line from bottom that have changed
y1 = 0; y1 = 0;
@ -2420,9 +2421,11 @@ static void update_display_static(driver_base *drv)
if ((int)VIDEO_MODE_DEPTH < (int)VIDEO_DEPTH_8BIT) { if ((int)VIDEO_MODE_DEPTH < (int)VIDEO_DEPTH_8BIT) {
const int src_bytes_per_row = bytes_per_row; const int src_bytes_per_row = bytes_per_row;
const int dst_bytes_per_row = drv->s->pitch; const int dst_bytes_per_row = drv->s->pitch;
const int pixels_per_byte = VIDEO_MODE_X / src_bytes_per_row; const int pixels_per_byte = 8/mac_depth_of_video_depth(VIDEO_MODE_DEPTH);
x1 = VIDEO_MODE_X / pixels_per_byte; const uint32 line_len = TrivialBytesPerRow(VIDEO_MODE_X, VIDEO_MODE_DEPTH);
x1 = line_len;
for (uint32 j = y1; j <= y2; j++) { for (uint32 j = y1; j <= y2; j++) {
p = &the_buffer[j * bytes_per_row]; p = &the_buffer[j * bytes_per_row];
p2 = &the_buffer_copy[j * bytes_per_row]; p2 = &the_buffer_copy[j * bytes_per_row];
@ -2440,7 +2443,7 @@ static void update_display_static(driver_base *drv)
p2 = &the_buffer_copy[j * bytes_per_row]; p2 = &the_buffer_copy[j * bytes_per_row];
p += bytes_per_row; p += bytes_per_row;
p2 += bytes_per_row; p2 += bytes_per_row;
for (uint32 i = (VIDEO_MODE_X / pixels_per_byte); i > x2; i--) { for (uint32 i = line_len; i > x2; i--) {
p--; p2--; p--; p2--;
if (*p != *p2) { if (*p != *p2) {
x2 = i; x2 = i;
@ -2448,9 +2451,12 @@ static void update_display_static(driver_base *drv)
} }
} }
} }
x1 *= pixels_per_byte; x1 *= pixels_per_byte;
x2 *= pixels_per_byte; x2 *= pixels_per_byte;
wide = (x2 - x1 + pixels_per_byte - 1) & -pixels_per_byte; wide = x2 - x1;
x2_clipped = x2 > VIDEO_MODE_X? VIDEO_MODE_X : x2;
wide_clipped = x2_clipped - x1;
// Update copy of the_buffer // Update copy of the_buffer
if (high && wide) { if (high && wide) {
@ -2474,7 +2480,7 @@ static void update_display_static(driver_base *drv)
SDL_UnlockSurface(drv->s); SDL_UnlockSurface(drv->s);
// Refresh display // Refresh display
update_sdl_video(drv->s, x1, y1, wide, high); update_sdl_video(drv->s, x1, y1, wide_clipped, high);
} }
} else { } else {

8
BasiliskII/src/include/video.h
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@ -79,13 +79,13 @@ inline video_depth DepthModeForPixelDepth(int depth)
// Returns the name of a video_depth, or an empty string if the depth is unknown // Returns the name of a video_depth, or an empty string if the depth is unknown
const char * NameOfDepth(video_depth depth); const char * NameOfDepth(video_depth depth);
// Return a bytes-per-row value (assuming no padding) for the specified depth and pixel width // Return a bytes-per-row value (assuming enough bytes to fit the bits but no further padding) for the specified depth and pixel width
inline uint32 TrivialBytesPerRow(uint32 width, video_depth depth) inline uint32 TrivialBytesPerRow(uint32 width, video_depth depth)
{ {
switch (depth) { switch (depth) {
case VDEPTH_1BIT: return width / 8; case VDEPTH_1BIT: return (width + 7) / 8;
case VDEPTH_2BIT: return width / 4; case VDEPTH_2BIT: return (width + 3) / 4;
case VDEPTH_4BIT: return width / 2; case VDEPTH_4BIT: return (width + 1) / 2;
case VDEPTH_8BIT: return width; case VDEPTH_8BIT: return width;
case VDEPTH_16BIT: return width * 2; case VDEPTH_16BIT: return width * 2;
case VDEPTH_32BIT: return width * 4; case VDEPTH_32BIT: return width * 4;

8
SheepShaver/src/include/video.h
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@ -66,13 +66,13 @@ inline int DepthModeForPixelDepth(int depth)
} }
} }
// Return a bytes-per-row value (assuming no padding) for the specified depth and pixel width // Return a bytes-per-row value (assuming enough bytes to fit the bits but no further padding) for the specified depth and pixel width
inline uint32 TrivialBytesPerRow(uint32 width, int mode) inline uint32 TrivialBytesPerRow(uint32 width, int mode)
{ {
switch (mode) { switch (mode) {
case APPLE_1_BIT: return width / 8; case APPLE_1_BIT: return (width + 7) / 8;
case APPLE_2_BIT: return width / 4; case APPLE_2_BIT: return (width + 3) / 4;
case APPLE_4_BIT: return width / 2; case APPLE_4_BIT: return (width + 1) / 2;
case APPLE_8_BIT: return width; case APPLE_8_BIT: return width;
case APPLE_16_BIT: return width * 2; case APPLE_16_BIT: return width * 2;
case APPLE_32_BIT: return width * 4; case APPLE_32_BIT: return width * 4;