Support frame and video dumping from VideoCommon

Source/Core/VideoCommon/AbstractTexture.cpp

@@ -4,9 +4,12 @@
 
 #include <algorithm>
 
-#include "VideoCommon/AbstractTexture.h"
+#include "Common/Assert.h"
 
-AbstractTexture::AbstractTexture(const TextureConfig& c) : m_config(c)
+#include "VideoCommon/AbstractTexture.h"
+#include "VideoCommon/ImageWrite.h"
+
+AbstractTexture::AbstractTexture(const TextureConfig& c) : m_config(c), m_currently_mapped(false)
 {
 }
 
@@ -14,7 +17,87 @@ AbstractTexture::~AbstractTexture() = default;
 
 bool AbstractTexture::Save(const std::string& filename, unsigned int level)
 {
-  return false;
+  // We can't dump compressed textures currently (it would mean drawing them to a RGBA8
+  // framebuffer, and saving that). TextureCache does not call Save for custom textures
+  // anyway, so this is fine for now.
+  _assert_(m_config.format == AbstractTextureFormat::RGBA8);
+
+  auto result = level == 0 ? Map() : Map(level);
+
+  if (!result.has_value())
+  {
+    return false;
+  }
+
+  auto raw_data = result.value();
+  return TextureToPng(raw_data.data, raw_data.stride, filename, raw_data.width, raw_data.height);
+}
+
+std::optional<AbstractTexture::RawTextureInfo> AbstractTexture::Map()
+{
+  if (m_currently_mapped)
+  {
+    Unmap();
+    m_currently_mapped = false;
+  }
+  auto result = MapFullImpl();
+
+  if (!result.has_value())
+  {
+    m_currently_mapped = false;
+    return {};
+  }
+
+  m_currently_mapped = true;
+  return result;
+}
+
+std::optional<AbstractTexture::RawTextureInfo> AbstractTexture::Map(u32 level, u32 x, u32 y,
+                                                                    u32 width, u32 height)
+{
+  _assert_(level < m_config.levels);
+
+  u32 max_level_width = std::max(m_config.width >> level, 1u);
+  u32 max_level_height = std::max(m_config.height >> level, 1u);
+
+  _assert_(width < max_level_width);
+  _assert_(height < max_level_height);
+
+  auto result = MapRegionImpl(level, x, y, width, height);
+
+  if (!result.has_value())
+  {
+    m_currently_mapped = false;
+    return {};
+  }
+
+  m_currently_mapped = true;
+  return result;
+}
+
+std::optional<AbstractTexture::RawTextureInfo> AbstractTexture::Map(u32 level)
+{
+  _assert_(level < m_config.levels);
+
+  u32 level_width = std::max(m_config.width >> level, 1u);
+  u32 level_height = std::max(m_config.height >> level, 1u);
+
+  return Map(level, 0, 0, level_width, level_height);
+}
+
+void AbstractTexture::Unmap()
+{
+}
+
+std::optional<AbstractTexture::RawTextureInfo> AbstractTexture::MapFullImpl()
+{
+  return {};
+}
+
+std::optional<AbstractTexture::RawTextureInfo>
+AbstractTexture::MapRegionImpl(u32 level, u32 x, u32 y, u32 width, u32 height)
+{
+  return {};
 }
 
 bool AbstractTexture::IsCompressedHostTextureFormat(AbstractTextureFormat format)