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refactor bitmap and rom

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This commit is contained in:
scawful
2022-08-23 14:00:24 -05:00
parent 50252fd267
commit 8828557143
3 changed files with 28 additions and 29 deletions
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7
src/app/gfx/bitmap.cc
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@@ -119,10 +119,11 @@ absl::Status Bitmap::CreateFromTiles(const std::vector<Bitmap> &tiles) {
absl::Status Bitmap::WritePixel(int pos, uchar pixel) {
if (!surface_) {
return absl::InternalError("Surface not loaded");
}
surface_->pixels[pos] = pixel;
}
auto pixels = (char *)surface_->pixels;
pixels[pos] = pixel;
return absl::OkStatus();
}
}
} // namespace gfx
} // namespace app

41
src/app/rom.cc
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@@ -20,27 +20,17 @@
#include "app/core/constants.h"
#include "app/gfx/bitmap.h"
#define OVERWORLD_GRAPHICS_POS_1 0x4F80
#define OVERWORLD_GRAPHICS_POS_2 0x505F
#define OVERWORLD_GRAPHICS_POS_3 0x513E
#define COMPRESSION_STRING_MOD 7 << 5
#define SNES_BYTE_MAX 0xFF
#define CMD_MOD 0x07
#define CMD_EXPANDED_MOD 0xE0
#define CMD_EXPANDED_LENGTH_MOD 0x3FF
#define CMD_NORMAL_LENGTH_MOD 0x1F
namespace yaze {
namespace app {
namespace {
int GetGraphicsAddress(const uchar* data, uint8_t offset) {
auto part_one = data[OVERWORLD_GRAPHICS_POS_1 + offset] << 16;
auto part_two = data[OVERWORLD_GRAPHICS_POS_2 + offset] << 8;
auto part_three = data[OVERWORLD_GRAPHICS_POS_3 + offset];
auto part_one = data[kOverworldGraphicsPos1 + offset] << 16;
auto part_two = data[kOverworldGraphicsPos2 + offset] << 8;
auto part_three = data[kOverworldGraphicsPos3 + offset];
auto snes_addr = (part_one | part_two | part_three);
return core::SnesToPc(snes_addr);
}
@@ -182,7 +172,7 @@ void CheckIntraCopy(const uchar* rom_data, DataSizeArray& data_size_taken,
search_start -= start;
printf("- Found repeat of %d at %d\n", copied_size, search_start);
data_size_taken[kCommandRepeatingBytes] = copied_size;
cmd_args[kCommandRepeatingBytes][0] = search_start & SNES_BYTE_MAX;
cmd_args[kCommandRepeatingBytes][0] = search_start & kSnesByteMax;
cmd_args[kCommandRepeatingBytes][1] = search_start >> 8;
}
current_pos_u = src_data_pos;
@@ -279,12 +269,12 @@ absl::StatusOr<std::shared_ptr<CompressionPiece>> SplitCompressionPiece(
piece->command, length_left, piece->argument, piece->argument_length);
if (mode == kNintendoMode2) {
new_piece->argument[0] =
(offset + kMaxLengthCompression) & SNES_BYTE_MAX;
(offset + kMaxLengthCompression) & kSnesByteMax;
new_piece->argument[1] = (offset + kMaxLengthCompression) >> 8;
}
if (mode == kNintendoMode1) {
new_piece->argument[1] =
(offset + kMaxLengthCompression) & SNES_BYTE_MAX;
(offset + kMaxLengthCompression) & kSnesByteMax;
new_piece->argument[0] = (offset + kMaxLengthCompression) >> 8;
}
} break;
@@ -352,7 +342,7 @@ Bytes CreateCompressionString(std::shared_ptr<CompressionPiece>& start,
pos += piece->argument_length;
piece = piece->next;
}
output.push_back(SNES_BYTE_MAX);
output.push_back(kSnesByteMax);
return output;
}
@@ -502,17 +492,16 @@ absl::StatusOr<Bytes> ROM::Decompress(int offset, int size, bool reversed) {
uchar command = 0;
uchar header = rom_data_[offset];
while (header != SNES_BYTE_MAX) {
if ((header & CMD_EXPANDED_MOD) == CMD_EXPANDED_MOD) {
while (header != kSnesByteMax) {
if ((header & kExpandedMod) == kExpandedMod) {
// Expanded Command
command = ((header >> 2) & CMD_MOD);
length =
(((header << 8) | rom_data_[offset + 1]) & CMD_EXPANDED_LENGTH_MOD);
command = ((header >> 2) & kCommandMod);
length = (((header << 8) | rom_data_[offset + 1]) & kExpandedLengthMod);
offset += 2; // Advance 2 bytes in ROM
} else {
// Normal Command
command = ((header >> 5) & CMD_MOD);
length = (header & CMD_NORMAL_LENGTH_MOD);
command = ((header >> 5) & kCommandMod);
length = (header & kNormalLengthMod);
offset += 1; // Advance 1 byte in ROM
}
length += 1; // each commands is at least of size 1 even if index 00
@@ -549,8 +538,8 @@ absl::StatusOr<Bytes> ROM::Decompress(int offset, int size, bool reversed) {
offset += 1; // Advance 1 byte in the ROM
} break;
case kCommandRepeatingBytes: {
ushort s1 = ((rom_data_[offset + 1] & SNES_BYTE_MAX) << 8);
ushort s2 = ((rom_data_[offset] & SNES_BYTE_MAX));
ushort s1 = ((rom_data_[offset + 1] & kSnesByteMax) << 8);
ushort s2 = ((rom_data_[offset] & kSnesByteMax));
if (reversed) { // Reversed byte order for overworld maps
auto addr = (rom_data_[offset + 2]) | ((rom_data_[offset + 1]) << 8);
if (addr > offset) {

9
src/app/rom.h
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@@ -39,6 +39,15 @@ constexpr int kNintendoMode2 = 1;
constexpr int kTile32Num = 4432;
constexpr int kTitleStringOffset = 0x7FC0;
constexpr int kTitleStringLength = 20;
constexpr int kOverworldGraphicsPos1 = 0x4F80;
constexpr int kOverworldGraphicsPos2 = 0x505F;
constexpr int kOverworldGraphicsPos3 = 0x513E;
constexpr int kSnesByteMax = 0xFF;
constexpr int kCommandMod = 0x07;
constexpr int kExpandedMod = 0xE0;
constexpr int kExpandedLengthMod = 0x3FF;
constexpr int kNormalLengthMod = 0x1F;
constexpr uchar kGraphicsBitmap[8] = {0x80, 0x40, 0x20, 0x10,
0x08, 0x04, 0x02, 0x01};